Add support for AMD SEV and SEV-ES intra-host migration support.  Intra
host migration provides a low-cost mechanism for userspace VMM upgrades.

In the common case for intra host migration, we can rely on the normal
ioctls for passing data from one VMM to the next. SEV, SEV-ES, and other
confidential compute environments make most of this information opaque, and
render KVM ioctls such as "KVM_GET_REGS" irrelevant.  As a result, we need
the ability to pass this opaque metadata from one VMM to the next. The
easiest way to do this is to leave this data in the kernel, and transfer
ownership of the metadata from one KVM VM (or vCPU) to the next.  In-kernel
hand off makes it possible to move any data that would be
unsafe/impossible for the kernel to hand directly to userspace, and
cannot be reproduced using data that can be handed to userspace.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Adds testcases for intra host migration for SEV and SEV-ES. Also adds
locking test to confirm no deadlock exists.
Signed-off-by: Peter Gonda <pgonda@google.com>
Suggested-by: Sean Christopherson <seanjc@google.com>
Cc: Marc Orr <marcorr@google.com>
Cc: Sean Christopherson <seanjc@google.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: kvm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Message-Id: <20211021174303.385706-6-pgonda@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Refactors out open path support from open_kvm_dev_path_or_exit() and
adds new helper for SEV device path.
Signed-off-by: Peter Gonda <pgonda@google.com>
Suggested-by: Sean Christopherson <seanjc@google.com>
Cc: Marc Orr <marcorr@google.com>
Cc: Sean Christopherson <seanjc@google.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: kvm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Message-Id: <20211021174303.385706-5-pgonda@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

For SEV-ES to work with intra host migration the VMSAs, GHCB metadata,
and other SEV-ES info needs to be preserved along with the guest's
memory.
Signed-off-by: Peter Gonda <pgonda@google.com>
Reviewed-by: Marc Orr <marcorr@google.com>
Cc: Marc Orr <marcorr@google.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Sean Christopherson <seanjc@google.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: Wanpeng Li <wanpengli@tencent.com>
Cc: Jim Mattson <jmattson@google.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: kvm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Message-Id: <20211021174303.385706-4-pgonda@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

For SEV to work with intra host migration, contents of the SEV info struct
such as the ASID (used to index the encryption key in the AMD SP) and
the list of memory regions need to be transferred to the target VM.
This change adds a commands for a target VMM to get a source SEV VM's sev
info.
Signed-off-by: Peter Gonda <pgonda@google.com>
Suggested-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Marc Orr <marcorr@google.com>
Cc: Marc Orr <marcorr@google.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Sean Christopherson <seanjc@google.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: Wanpeng Li <wanpengli@tencent.com>
Cc: Jim Mattson <jmattson@google.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: kvm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Message-Id: <20211021174303.385706-3-pgonda@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Avoid code duplication across all callers of misc_cg_try_charge and
misc_cg_uncharge.  The resource type for KVM is always derived from
sev->es_active, and the quantity is always 1.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Generalize KVM_REQ_VM_BUGGED so that it can be called even in cases
where it is by design that the VM cannot be operated upon.  In this
case any KVM_BUG_ON should still warn, so introduce a new flag
kvm->vm_dead that is separate from kvm->vm_bugged.
Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Move SEV-ES vCPU metadata into new sev_es_state struct from vcpu_svm.
Signed-off-by: Peter Gonda <pgonda@google.com>
Suggested-by: Tom Lendacky <thomas.lendacky@amd.com>
Acked-by: Tom Lendacky <thomas.lendacky@amd.com>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Cc: Marc Orr <marcorr@google.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: Wanpeng Li <wanpengli@tencent.com>
Cc: Jim Mattson <jmattson@google.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: kvm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Message-Id: <20211021174303.385706-2-pgonda@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Add guest api and guest kernel support for SEV live migration.

Introduces a new hypercall to notify the host of changes to the page
encryption status.  If the page is encrypted then it must be migrated
through the SEV firmware or a helper VM sharing the key.  If page is
not encrypted then it can be migrated normally by userspace.  This new
hypercall is invoked using paravirt_ops.

Conflicts: sev_active() replaced by cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT).

Reset the host's shared pages list related to kernel
specific page encryption status settings before we load a
new kernel by kexec. We cannot reset the complete
shared pages list here as we need to retain the
UEFI/OVMF firmware specific settings.

The host's shared pages list is maintained for the
guest to keep track of all unencrypted guest memory regions,
therefore we need to explicitly mark all shared pages as
encrypted again before rebooting into the new guest kernel.
Signed-off-by: Ashish Kalra <ashish.kalra@amd.com>
Reviewed-by: Steve Rutherford <srutherford@google.com>
Message-Id: <3e051424ab839ea470f88333273d7a185006754f.1629726117.git.ashish.kalra@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

The guest support for detecting and enabling SEV Live migration
feature uses the following logic :

 - kvm_init_plaform() checks if its booted under the EFI

   - If not EFI,

     i) if kvm_para_has_feature(KVM_FEATURE_MIGRATION_CONTROL), issue a wrmsrl()
         to enable the SEV live migration support

   - If EFI,

     i) If kvm_para_has_feature(KVM_FEATURE_MIGRATION_CONTROL), read
        the UEFI variable which indicates OVMF support for live migration

     ii) the variable indicates live migration is supported, issue a wrmsrl() to
          enable the SEV live migration support

The EFI live migration check is done using a late_initcall() callback.

Also, ensure that _bss_decrypted section is marked as decrypted in the
hypervisor's guest page encryption status tracking.
Signed-off-by: Ashish Kalra <ashish.kalra@amd.com>
Reviewed-by: Steve Rutherford <srutherford@google.com>
Message-Id: <b4453e4c87103ebef12217d2505ea99a1c3e0f0f.1629726117.git.ashish.kalra@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Introduce a new AMD Memory Encryption GUID which is currently
used for defining a new UEFI environment variable which indicates
UEFI/OVMF support for the SEV live migration feature. This variable
is setup when UEFI/OVMF detects host/hypervisor support for SEV
live migration and later this variable is read by the kernel using
EFI runtime services to verify if OVMF supports the live migration
feature.
Signed-off-by: Ashish Kalra <ashish.kalra@amd.com>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Message-Id: <1cea22976d2208f34d47e0c1ce0ecac816c13111.1629726117.git.ashish.kalra@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Invoke a hypercall when a memory region is changed from encrypted ->
decrypted and vice versa. Hypervisor needs to know the page encryption
status during the guest migration.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Borislav Petkov <bp@suse.de>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: x86@kernel.org
Cc: kvm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Reviewed-by: Steve Rutherford <srutherford@google.com>
Reviewed-by: Venu Busireddy <venu.busireddy@oracle.com>
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Signed-off-by: Ashish Kalra <ashish.kalra@amd.com>
Reviewed-by: Borislav Petkov <bp@suse.de>
Message-Id: <0a237d5bb08793916c7790a3e653a2cbe7485761.1629726117.git.ashish.kalra@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

KVM hypercall framework relies on alternative framework to patch the
VMCALL -> VMMCALL on AMD platform. If a hypercall is made before
apply_alternative() is called then it defaults to VMCALL. The approach
works fine on non SEV guest. A VMCALL would causes #UD, and hypervisor
will be able to decode the instruction and do the right things. But
when SEV is active, guest memory is encrypted with guest key and
hypervisor will not be able to decode the instruction bytes.

To highlight the need to provide this interface, capturing the
flow of apply_alternatives() :
setup_arch() call init_hypervisor_platform() which detects
the hypervisor platform the kernel is running under and then the
hypervisor specific initialization code can make early hypercalls.
For example, KVM specific initialization in case of SEV will try
to mark the "__bss_decrypted" section's encryption state via early
page encryption status hypercalls.

Now, apply_alternatives() is called much later when setup_arch()
calls check_bugs(), so we do need some kind of an early,
pre-alternatives hypercall interface. Other cases of pre-alternatives
hypercalls include marking per-cpu GHCB pages as decrypted on SEV-ES
and per-cpu apf_reason, steal_time and kvm_apic_eoi as decrypted for
SEV generally.

Add SEV specific hypercall3, it unconditionally uses VMMCALL. The hypercall
will be used by the SEV guest to notify encrypted pages to the hypervisor.

This kvm_sev_hypercall3() function is abstracted and used as follows :
All these early hypercalls are made through early_set_memory_XX() interfaces,
which in turn invoke pv_ops (paravirt_ops).

This early_set_memory_XX() -> pv_ops.mmu.notify_page_enc_status_changed()
is a generic interface and can easily have SEV, TDX and any other
future platform specific abstractions added to it.

Currently, pv_ops.mmu.notify_page_enc_status_changed() callback is setup to
invoke kvm_sev_hypercall3() in case of SEV.

Similarly, in case of TDX, pv_ops.mmu.notify_page_enc_status_changed()
can be setup to a TDX specific callback.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Borislav Petkov <bp@suse.de>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: x86@kernel.org
Cc: kvm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Reviewed-by: Steve Rutherford <srutherford@google.com>
Reviewed-by: Venu Busireddy <venu.busireddy@oracle.com>
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Signed-off-by: Ashish Kalra <ashish.kalra@amd.com>
Message-Id: <6fd25c749205dd0b1eb492c60d41b124760cc6ae.1629726117.git.ashish.kalra@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Pull ext4 updates from Ted Ts'o:
 "Only bug fixes and cleanups for ext4 this merge window.

  Of note are fixes for the combination of the inline_data and
  fast_commit fixes, and more accurately calculating when to schedule
  additional lazy inode table init, especially when CONFIG_HZ is 100HZ"

* tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
  ext4: fix error code saved on super block during file system abort
  ext4: inline data inode fast commit replay fixes
  ext4: commit inline data during fast commit
  ext4: scope ret locally in ext4_try_to_trim_range()
  ext4: remove an unused variable warning with CONFIG_QUOTA=n
  ext4: fix boolreturn.cocci warnings in fs/ext4/name.c
  ext4: prevent getting empty inode buffer
  ext4: move ext4_fill_raw_inode() related functions
  ext4: factor out ext4_fill_raw_inode()
  ext4: prevent partial update of the extent blocks
  ext4: check for inconsistent extents between index and leaf block
  ext4: check for out-of-order index extents in ext4_valid_extent_entries()
  ext4: convert from atomic_t to refcount_t on ext4_io_end->count
  ext4: refresh the ext4_ext_path struct after dropping i_data_sem.
  ext4: ensure enough credits in ext4_ext_shift_path_extents
  ext4: correct the left/middle/right debug message for binsearch
  ext4: fix lazy initialization next schedule time computation in more granular unit
  Revert "ext4: enforce buffer head state assertion in ext4_da_map_blocks"

Pull btrfs fix from David Sterba:
 "Fix for a deadlock when direct/buffered IO is done on a mmaped file
  and a fault happens (details in the patch). There's a fstest
  generic/647 that triggers the problem and makes testing hard"

* tag 'for-5.16-deadlock-fix-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
  btrfs: fix deadlock due to page faults during direct IO reads and writes

Pull nfsd updates from Bruce Fields:
 "A slow cycle for nfsd: mainly cleanup, including Neil's patch dropping
  support for a filehandle format deprecated 20 years ago, and further
  xdr-related cleanup from Chuck"

* tag 'nfsd-5.16' of git://linux-nfs.org/~bfields/linux: (26 commits)
  nfsd4: remove obselete comment
  nfsd: document server-to-server-copy parameters
  NFSD:fix boolreturn.cocci warning
  nfsd: update create verifier comment
  SUNRPC: Change return value type of .pc_encode
  SUNRPC: Replace the "__be32 *p" parameter to .pc_encode
  NFSD: Save location of NFSv4 COMPOUND status
  SUNRPC: Change return value type of .pc_decode
  SUNRPC: Replace the "__be32 *p" parameter to .pc_decode
  SUNRPC: De-duplicate .pc_release() call sites
  SUNRPC: Simplify the SVC dispatch code path
  SUNRPC: Capture value of xdr_buf::page_base
  SUNRPC: Add trace event when alloc_pages_bulk() makes no progress
  svcrdma: Split svcrmda_wc_{read,write} tracepoints
  svcrdma: Split the svcrdma_wc_send() tracepoint
  svcrdma: Split the svcrdma_wc_receive() tracepoint
  NFSD: Have legacy NFSD WRITE decoders use xdr_stream_subsegment()
  SUNRPC: xdr_stream_subsegment() must handle non-zero page_bases
  NFSD: Initialize pointer ni with NULL and not plain integer 0
  NFSD: simplify struct nfsfh
  ...

Pull NFS client updates from Trond Myklebust:
 "Highlights include:

  Features:
   - NFSv4.1 can always retrieve and cache the ACCESS mode on OPEN
   - Optimisations for READDIR and the 'ls -l' style workload
   - Further replacements of dprintk() with tracepoints and other
     tracing improvements
   - Ensure we re-probe NFSv4 server capabilities when the user does a
     "mount -o remount"

  Bugfixes:
   - Fix an Oops in pnfs_mark_request_commit()
   - Fix up deadlocks in the commit code
   - Fix regressions in NFSv2/v3 attribute revalidation due to the
     change_attr_type optimisations
   - Fix some dentry verifier races
   - Fix some missing dentry verifier settings
   - Fix a performance regression in nfs_set_open_stateid_locked()
   - SUNRPC was sending multiple SYN calls when re-establishing a TCP
     connection.
   - Fix multiple NFSv4 issues due to missing sanity checking of server
     return values
   - Fix a potential Oops when FREE_STATEID races with an unmount

  Cleanups:
   - Clean up the labelled NFS code
   - Remove unused header <linux/pnfs_osd_xdr.h>"

* tag 'nfs-for-5.16-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs: (84 commits)
  NFSv4: Sanity check the parameters in nfs41_update_target_slotid()
  NFS: Remove the nfs4_label argument from decode_getattr_*() functions
  NFS: Remove the nfs4_label argument from nfs_setsecurity
  NFS: Remove the nfs4_label argument from nfs_fhget()
  NFS: Remove the nfs4_label argument from nfs_add_or_obtain()
  NFS: Remove the nfs4_label argument from nfs_instantiate()
  NFS: Remove the nfs4_label from the nfs_setattrres
  NFS: Remove the nfs4_label from the nfs4_getattr_res
  NFS: Remove the f_label from the nfs4_opendata and nfs_openres
  NFS: Remove the nfs4_label from the nfs4_lookupp_res struct
  NFS: Remove the label from the nfs4_lookup_res struct
  NFS: Remove the nfs4_label from the nfs4_link_res struct
  NFS: Remove the nfs4_label from the nfs4_create_res struct
  NFS: Remove the nfs4_label from the nfs_entry struct
  NFS: Create a new nfs_alloc_fattr_with_label() function
  NFS: Always initialise fattr->label in nfs_fattr_alloc()
  NFSv4.2: alloc_file_pseudo() takes an open flag, not an f_mode
  NFS: Don't allocate nfs_fattr on the stack in __nfs42_ssc_open()
  NFSv4: Remove unnecessary 'minor version' check
  NFSv4: Fix potential Oops in decode_op_map()
  ...

Merge branch 'exit-cleanups-for-v5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace

Pull exit cleanups from Eric Biederman:
 "While looking at some issues related to the exit path in the kernel I
  found several instances where the code is not using the existing
  abstractions properly.

  This set of changes introduces force_fatal_sig a way of sending a
  signal and not allowing it to be caught, and corrects the misuse of
  the existing abstractions that I found.

  A lot of the misuse of the existing abstractions are silly things such
  as doing something after calling a no return function, rolling BUG by
  hand, doing more work than necessary to terminate a kernel thread, or
  calling do_exit(SIGKILL) instead of calling force_sig(SIGKILL).

  In the review a deficiency in force_fatal_sig and force_sig_seccomp
  where ptrace or sigaction could prevent the delivery of the signal was
  found. I have added a change that adds SA_IMMUTABLE to change that
  makes it impossible to interrupt the delivery of those signals, and
  allows backporting to fix force_sig_seccomp

  And Arnd found an issue where a function passed to kthread_run had the
  wrong prototype, and after my cleanup was failing to build."

* 'exit-cleanups-for-v5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace: (23 commits)
  soc: ti: fix wkup_m3_rproc_boot_thread return type
  signal: Add SA_IMMUTABLE to ensure forced siganls do not get changed
  signal: Replace force_sigsegv(SIGSEGV) with force_fatal_sig(SIGSEGV)
  exit/r8188eu: Replace the macro thread_exit with a simple return 0
  exit/rtl8712: Replace the macro thread_exit with a simple return 0
  exit/rtl8723bs: Replace the macro thread_exit with a simple return 0
  signal/x86: In emulate_vsyscall force a signal instead of calling do_exit
  signal/sparc32: In setup_rt_frame and setup_fram use force_fatal_sig
  signal/sparc32: Exit with a fatal signal when try_to_clear_window_buffer fails
  exit/syscall_user_dispatch: Send ordinary signals on failure
  signal: Implement force_fatal_sig
  exit/kthread: Have kernel threads return instead of calling do_exit
  signal/s390: Use force_sigsegv in default_trap_handler
  signal/vm86_32: Properly send SIGSEGV when the vm86 state cannot be saved.
  signal/vm86_32: Replace open coded BUG_ON with an actual BUG_ON
  signal/sparc: In setup_tsb_params convert open coded BUG into BUG
  signal/powerpc: On swapcontext failure force SIGSEGV
  signal/sh: Use force_sig(SIGKILL) instead of do_group_exit(SIGKILL)
  signal/mips: Update (_save|_restore)_fp_context to fail with -EFAULT
  signal/sparc32: Remove unreachable do_exit in do_sparc_fault
  ...

Pull prctl updates from Christian Brauner:
 "This contains the missing prctl uapi pieces for PR_SCHED_CORE.

  In order to activate core scheduling the caller is expected to specify
  the scope of the new core scheduling domain.

  For example, passing 2 in the 4th argument of

     prctl(PR_SCHED_CORE, PR_SCHED_CORE_CREATE, <pid>,  2, 0);

  would indicate that the new core scheduling domain encompasses all
  tasks in the process group of <pid>. Specifying 0 would only create a
  core scheduling domain for the thread identified by <pid> and 2 would
  encompass the whole thread-group of <pid>.

  Note, the values 0, 1, and 2 correspond to PIDTYPE_PID, PIDTYPE_TGID,
  and PIDTYPE_PGID. A first version tried to expose those values
  directly to which I objected because:

   - PIDTYPE_* is an enum that is kernel internal which we should not
     expose to userspace directly.

   - PIDTYPE_* indicates what a given struct pid is used for it doesn't
     express a scope.

  But what the 4th argument of PR_SCHED_CORE prctl() expresses is the
  scope of the operation, i.e. the scope of the core scheduling domain
  at creation time. So Eugene's patch now simply introduces three new
  defines PR_SCHED_CORE_SCOPE_THREAD, PR_SCHED_CORE_SCOPE_THREAD_GROUP,
  and PR_SCHED_CORE_SCOPE_PROCESS_GROUP. They simply express what
  happens.

  This has been on the mailing list for quite a while with all relevant
  scheduler folks Cced. I announced multiple times that I'd pick this up
  if I don't see or her anyone else doing it. None of this touches
  proper scheduler code but only concerns uapi so I think this is fine.

  With core scheduling being quite common now for vm managers (e.g.
  moving individual vcpu threads into their own core scheduling domain)
  and container managers (e.g. moving the init process into its own core
  scheduling domain and letting all created children inherit it) having
  to rely on raw numbers passed as the 4th argument in prctl() is a bit
  annoying and everyone is starting to come up with their own defines"

* tag 'kernel.sys.v5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux:
  uapi/linux/prctl: provide macro definitions for the PR_SCHED_CORE type argument

Pull pidfd updates from Christian Brauner:
 "Various places in the kernel have picked up pidfds.

  The two most recent additions have probably been the ability to use
  pidfds in bpf maps and the usage of pidfds in mm-based syscalls such
  as process_mrelease() and process_madvise().

  The same pattern to turn a pidfd into a struct task exists in two
  places. One of those places used PIDTYPE_TGID while the other one used
  PIDTYPE_PID even though it is clearly documented in all pidfd-helpers
  that pidfds __currently__ only refer to thread-group leaders (subject
  to change in the future if need be).

  This isn't a bug per se but has the potential to be one if we allow
  pidfds to refer to individual threads. If that happens we want to
  audit all codepaths that make use of them to ensure they can deal with
  pidfds refering to individual threads.

  This adds a simple helper to turn a pidfd into a struct task making it
  easy to grep for such places. Plus, it gets rid of code-duplication"

* tag 'pidfd.v5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux:
  mm: use pidfd_get_task()
  pid: add pidfd_get_task() helper

Pull more thermal control updates from Rafael Wysocki:
 "These fix two issues in the thermal core and one in the int340x
  thermal driver.

  Specifics:

   - Replace pr_warn() with pr_warn_once() in user_space_bind() to
     reduce kernel log noise (Rafael Wysocki).

   - Extend the RFIM mailbox interface in the int340x thermal driver to
     return 64 bit values to allow all values returned by the hardware
     to be handled correctly (Srinivas Pandruvada).

   - Fix possible NULL pointer dereferences in the of_thermal_ family of
     functions (Subbaraman Narayanamurthy)"

* tag 'thermal-5.16-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  thermal: Replace pr_warn() with pr_warn_once() in user_space_bind()
  thermal: Fix NULL pointer dereferences in of_thermal_ functions
  thermal/drivers/int340x: processor_thermal: Suppot 64 bit RFIM responses

Pull more power management updates from Rafael Wysocki:
 "These fix three intel_pstate driver regressions, fix locking in the
  core code suspending and resuming devices during system PM
  transitions, fix the handling of cpuidle drivers based on runtime PM
  during system-wide suspend, fix two issues in the operating
  performance points (OPP) framework and resource-managed helpers to it.

  Specifics:

   - Fix two intel_pstate driver regressions related to the HWP
     interrupt handling added recently (Srinivas Pandruvada).

   - Fix intel_pstate driver regression introduced during the 5.11 cycle
     and causing HWP desired performance to be mishandled in some cases
     when switching driver modes and during system suspend and shutdown
     (Rafael Wysocki).

   - Fix system-wide device suspend and resume locking to avoid
     deadlocks when device objects are deleted during a system-wide PM
     transition (Rafael Wysocki).

   - Modify system-wide suspend of devices to prevent cpuidle drivers
     based on runtime PM from misbehaving during the "no IRQ" phase of
     it (Ulf Hansson).

   - Fix return value of _opp_add_static_v2() helper (YueHaibing).

   - Fix required-opp handle count (Pavankumar Kondeti).

   - Add resource managed OPP helpers, update dev_pm_opp_attach_genpd(),
     update their devfreq users, and make minor DT binding change
     (Dmitry Osipenko)"

* tag 'pm-5.16-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  PM: sleep: Avoid calling put_device() under dpm_list_mtx
  cpufreq: intel_pstate: Clear HWP Status during HWP Interrupt enable
  cpufreq: intel_pstate: Fix unchecked MSR 0x773 access
  cpufreq: intel_pstate: Clear HWP desired on suspend/shutdown and offline
  PM: sleep: Fix runtime PM based cpuidle support
  dt-bindings: opp: Allow multi-worded OPP entry name
  opp: Fix return in _opp_add_static_v2()
  PM / devfreq: tegra30: Check whether clk_round_rate() returns zero rate
  PM / devfreq: tegra30: Use resource-managed helpers
  PM / devfreq: Add devm_devfreq_add_governor()
  opp: Add more resource-managed variants of dev_pm_opp_of_add_table()
  opp: Change type of dev_pm_opp_attach_genpd(names) argument
  opp: Fix required-opps phandle array count check

Pull more ACPI updates from Rafael Wysocki:
 "These add support for a new ACPI device configuration object called
  _DSC, fix some issues including one recent regression, add two new
  items to quirk lists and clean up assorted pieces of code.

  Specifics:

   - Add support for new ACPI device configuration object called _DSC
     ("Deepest State for Configuration") to allow certain devices to be
     probed without changing their power states, document it and make
     two drivers use it (Sakari Ailus, Rajmohan Mani).

   - Fix device wakeup power reference counting broken recently by
     mistake (Rafael Wysocki).

   - Drop unused symbol and macros depending on it from acgcc.h (Rafael
     Wysocki).

   - Add HP ZHAN 66 Pro to the "no EC wakeup" quirk list (Binbin Zhou).

   - Add Xiaomi Mi Pad 2 to the backlight quirk list and drop an unused
     piece of data from all of the list entries (Hans de Goede).

   - Fix register read accesses handling in the Intel PMIC operation
     region driver (Hans de Goede).

   - Clean up static variables initialization in the EC driver
     (wangzhitong)"

* tag 'acpi-5.16-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  Documentation: ACPI: Fix non-D0 probe _DSC object example
  ACPI: Drop ACPI_USE_BUILTIN_STDARG ifdef from acgcc.h
  ACPI: PM: Fix device wakeup power reference counting error
  ACPI: video: use platform backlight driver on Xiaomi Mi Pad 2
  ACPI: video: Drop dmi_system_id.ident settings from video_detect_dmi_table[]
  ACPI: PMIC: Fix intel_pmic_regs_handler() read accesses
  ACPI: EC: Remove initialization of static variables to false
  ACPI: EC: Use ec_no_wakeup on HP ZHAN 66 Pro
  at24: Support probing while in non-zero ACPI D state
  media: i2c: imx319: Support device probe in non-zero ACPI D state
  ACPI: Add a convenience function to tell a device is in D0 state
  Documentation: ACPI: Document _DSC object usage for enum power state
  i2c: Allow an ACPI driver to manage the device's power state during probe
  ACPI: scan: Obtain device's desired enumeration power state

Pull dmaengine updates from Vinod Koul:
 "A bunch of driver updates, no new driver or controller support this
  time though:

   - Another pile of idxd updates

   - pm routines cleanup for at_xdmac driver

   - Correct handling of callback_result for few drivers

   - zynqmp_dma driver updates and descriptor management refinement

   - Hardware handshaking support for dw-axi-dmac

   - Support for remotely powered controllers in Qcom bam dma

   - tegra driver updates"

* tag 'dmaengine-5.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vkoul/dmaengine: (69 commits)
  dmaengine: ti: k3-udma: Set r/tchan or rflow to NULL if request fail
  dmaengine: ti: k3-udma: Set bchan to NULL if a channel request fail
  dmaengine: stm32-dma: avoid 64-bit division in stm32_dma_get_max_width
  dmaengine: fsl-edma: support edma memcpy
  dmaengine: idxd: fix resource leak on dmaengine driver disable
  dmaengine: idxd: cleanup completion record allocation
  dmaengine: zynqmp_dma: Correctly handle descriptor callbacks
  dmaengine: xilinx_dma: Correctly handle cyclic descriptor callbacks
  dmaengine: altera-msgdma: Correctly handle descriptor callbacks
  dmaengine: at_xdmac: fix compilation warning
  dmaengine: dw-axi-dmac: Simplify assignment in dma_chan_pause()
  dmaengine: qcom: bam_dma: Add "powered remotely" mode
  dt-bindings: dmaengine: bam_dma: Add "powered remotely" mode
  dmaengine: sa11x0: Mark PM functions as __maybe_unused
  dmaengine: switch from 'pci_' to 'dma_' API
  dmaengine: ioat: switch from 'pci_' to 'dma_' API
  dmaengine: hsu: switch from 'pci_' to 'dma_' API
  dmaengine: hisi_dma: switch from 'pci_' to 'dma_' API
  dmaengine: dw: switch from 'pci_' to 'dma_' API
  dmaengine: dw-edma-pcie: switch from 'pci_' to 'dma_' API
  ...

Merge tag 'tag-chrome-platform-for-v5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/chrome-platform/linux

Pull chrome platform updates from Benson Leung:
 "cros_ec_typec:

   - Clean up use of cros_ec_check_features

  cros_ec_*:

   - Rename and move cros_ec_pd_command to cros_ec_command, and make
     changes to cros_ec_typec and cros_ec_proto to use the new common
     command, reducing duplication.

  sensorhub:

   - simplify getting .driver_data in cros_ec_sensors_core and
     cros_ec_sensorhub

  misc:

   - Maintainership change. Enric Balletbo i Serra has moved on from
     Collabora, so removing him from chrome/platform maintainers. Thanks
     for all of your hard work maintaining this, Enric, and best of luck
     to you in your new role!

   - Add Prashant Malani as driver maintainer for cros_ec_typec.c and
     cros_usbpd_notify. He was already principal contributor of these
     drivers"

* tag 'tag-chrome-platform-for-v5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/chrome-platform/linux:
  platform/chrome: cros_ec_proto: Use ec_command for check_features
  platform/chrome: cros_ec_proto: Use EC struct for features
  MAINTAINERS: Chrome: Drop Enric Balletbo i Serra
  platform/chrome: cros_ec_typec: Use cros_ec_command()
  platform/chrome: cros_ec_proto: Add version for ec_command
  platform/chrome: cros_ec_proto: Make data pointers void
  platform/chrome: cros_usbpd_notify: Move ec_command()
  platform/chrome: cros_usbpd_notify: Rename cros_ec_pd_command()
  platform/chrome: cros_ec: Fix spelling mistake "responsed" -> "response"
  platform/chrome: cros_ec_sensorhub: simplify getting .driver_data
  iio: common: cros_ec_sensors: simplify getting .driver_data
  platform/chrome: cros-ec-typec: Cleanup use of check_features
  platform/chrome: cros_ec_proto: Fix check_features ret val
  MAINTAINERS: Add Prashant's maintainership of cros_ec drivers

Pull arm64 fixes from Will Deacon:

 - Fix double-evaluation of 'pte' macro argument when using 52-bit PAs

 - Fix signedness of some MTE prctl PR_* constants

 - Fix kmemleak memory usage by skipping early pgtable allocations

 - Fix printing of CPU feature register strings

 - Remove redundant -nostdlib linker flag for vDSO binaries

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: pgtable: make __pte_to_phys/__phys_to_pte_val inline functions
  arm64: Track no early_pgtable_alloc() for kmemleak
  arm64: mte: change PR_MTE_TCF_NONE back into an unsigned long
  arm64: vdso: remove -nostdlib compiler flag
  arm64: arm64_ftr_reg->name may not be a human-readable string

Pull ARM SoC fixes from Arnd Bergmann:
 "This is one set of fixes for the NXP/FSL DPAA2 drivers, addressing a
  few minor issues. I received these just after sending out the last
  v5.15 fixes, and nothing in here seemed urgent enough for a quick
  follow-up"

* tag 'arm-fixes-5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc:
  soc: fsl: dpaa2-console: free buffer before returning from dpaa2_console_read
  soc: fsl: dpio: use the combined functions to protect critical zone
  soc: fsl: dpio: replace smp_processor_id with raw_smp_processor_id

Pull asm-generic cleanup from Arnd Bergmann:
 "This is a single cleanup from Peter Collingbourne, removing some dead
  code"

* tag 'asm-generic-5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic:
  arch: remove unused function syscall_set_arguments()

Pull xen updates from Juergen Gross:

 - a series to speed up the boot of Xen PV guests

 - some cleanups in Xen related code

 - replacement of license texts with the appropriate SPDX headers and
   fixing of wrong SPDX headers in Xen header files

 - a small series making paravirtualized interrupt masking much simpler
   and at the same time removing complaints of objtool

 - a fix for Xen ballooning hogging workqueues for too long

 - enablement of the Xen pciback driver for Arm

 - some further small fixes/enhancements

* tag 'for-linus-5.16b-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip: (22 commits)
  xen/balloon: fix unused-variable warning
  xen/balloon: rename alloc/free_xenballooned_pages
  xen/balloon: add late_initcall_sync() for initial ballooning done
  x86/xen: remove 32-bit awareness from startup_xen
  xen: remove highmem remnants
  xen: allow pv-only hypercalls only with CONFIG_XEN_PV
  x86/xen: remove 32-bit pv leftovers
  xen-pciback: allow compiling on other archs than x86
  x86/xen: switch initial pvops IRQ functions to dummy ones
  x86/xen: remove xen_have_vcpu_info_placement flag
  x86/pvh: add prototype for xen_pvh_init()
  xen: Fix implicit type conversion
  xen: fix wrong SPDX headers of Xen related headers
  xen/pvcalls-back: Remove redundant 'flush_workqueue()' calls
  x86/xen: Remove redundant irq_enter/exit() invocations
  xen-pciback: Fix return in pm_ctrl_init()
  xen/x86: restrict PV Dom0 identity mapping
  xen/x86: there's no highmem anymore in PV mode
  xen/x86: adjust handling of the L3 user vsyscall special page table
  xen/x86: adjust xen_set_fixmap()
  ...

Pull libnvdimm update from Dan Williams:
 "A single cleanup that precedes some deeper PMEM/DAX reworks that did
  not settle in time for v5.16:

   - Continue the cleanup of the dax api in preparation for a dax-device
     block-device divorce"

* tag 'libnvdimm-for-5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
  nvdimm/pmem: move dax_attribute_group from dax to pmem

Pull watchdog updates from Wim Van Sebroeck:

 - f71808e_wdt: convert to watchdog framework

 - db8500_wdt: Rename driver (was ux500_wdt.c)

 - sunxi: Add compatibles for R329 and D1

 - mtk: add disable_wdt_extrst support

 - several other small fixes and improvements

* tag 'linux-watchdog-5.16-rc1' of git://www.linux-watchdog.org/linux-watchdog: (30 commits)
  watchdog: db8500_wdt: Rename symbols
  watchdog: db8500_wdt: Rename driver
  watchdog: ux500_wdt: Drop platform data
  watchdog: bcm63xx_wdt: fix fallthrough warning
  watchdog: iTCO_wdt: No need to stop the timer in probe
  watchdog: s3c2410: describe driver in KConfig
  watchdog: sp5100_tco: Add support for get_timeleft
  watchdog: mtk: add disable_wdt_extrst support
  dt-bindings: watchdog: mtk-wdt: add disable_wdt_extrst support
  watchdog: rza_wdt: Use semicolons instead of commas
  watchdog: mlx-wdt: Use regmap_write_bits()
  watchdog: rti-wdt: Make use of the helper function devm_platform_ioremap_resource()
  watchdog: iTCO_wdt: Make use of the helper function devm_platform_ioremap_resource()
  watchdog: ar7_wdt: Make use of the helper function devm_platform_ioremap_resource_byname()
  watchdog: sunxi_wdt: Add support for D1
  dt-bindings: watchdog: sunxi: Add compatibles for D1
  ar7: fix kernel builds for compiler test
  dt-bindings: watchdog: sunxi: Add compatibles for R329
  watchdog: meson_gxbb_wdt: add timeout parameter
  watchdog: meson_gxbb_wdt: add nowayout parameter
  ...

Pull remoteproc updates from Bjorn Andersson:
 "The remoteproc repo is moved to a new path on git.kernel.org, to allow
  Mathieu push access to the branches.

  Support for the Mediatek MT8195 SCP was added, the related DeviceTree
  binding was converted to YAML and MT8192 SCP was documented as well.

  Amlogic Meson6, Meson8, Meson8b and Meson8m2 has an ARC core to aid in
  resuming the system after suspend, a new remoteproc driver for booting
  this core is introduced.

  A new driver to support the DSP processor found on NXP i.MX8QM,
  i.MX8QXP, i.MX8MP and i.MX8ULP is added.

  The Qualcomm modem and TrustZone based remoteproc drivers gains
  support for the modem in SC7280 and MSM8996 gains support for a
  missing power-domain.

  Throughout the Qualcomm drivers, the support for informing the
  always-on power coprocessor about the state of each remoteproc is
  reworked to avoid complications related to our use of genpd and the
  system suspend state.

  Lastly a number of small fixes are found throughout the drivers and
  framework"

* tag 'rproc-v5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/remoteproc/linux: (39 commits)
  remoteproc: Remove vdev_to_rvdev and vdev_to_rproc from remoteproc API
  remoteproc: omap_remoteproc: simplify getting .driver_data
  remoteproc: qcom_q6v5_mss: Use devm_platform_ioremap_resource_byname() to simplify code
  remoteproc: Fix a memory leak in an error handling path in 'rproc_handle_vdev()'
  remoteproc: Fix spelling mistake "atleast" -> "at least"
  remoteproc: imx_dsp_rproc: mark PM functions as __maybe_unused
  remoteproc: imx_dsp_rproc: Correct the comment style of copyright
  dt-bindings: dsp: fsl: Update binding document for remote proc driver
  remoteproc: imx_dsp_rproc: Add remoteproc driver for DSP on i.MX
  remoteproc: imx_rproc: Add IMX_RPROC_SCU_API method
  remoteproc: imx_rproc: Move common structure to header file
  rpmsg: char: Remove useless include
  remoteproc: meson-mx-ao-arc: fix a bit test
  remoteproc: mss: q6v5-mss: Add modem support on SC7280
  dt-bindings: remoteproc: qcom: Update Q6V5 Modem PIL binding
  remoteproc: qcom: pas: Add SC7280 Modem support
  dt-bindings: remoteproc: qcom: pas: Add SC7280 MPSS support
  remoteproc: qcom: pas: Use the same init resources for MSM8996 and MSM8998
  MAINTAINERS: Update remoteproc repo url
  dt-bindings: remoteproc: k3-dsp: Cleanup SoC compatible from DT example
  ...

Pull rpmsg updates from Bjorn Andersson:
 "For the GLINK implementation this adds support for splitting outgoing
  messages that are too large to fit in the fifo, it introduces the use
  of "read notifications", to avoid polling in the case where the
  outgoing fifo is full and a few bugs are squashed.

  The return value of rpmsg_create_ept() for when RPMSG is disabled is
  corrected to return a valid error, the Mediatek rpmsg driver is
  updated to match the DT binding and a couple of cleanups are done in
  the virtio rpmsg driver"

* tag 'rpmsg-v5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/remoteproc/linux:
  rpmsg: glink: Send READ_NOTIFY command in FIFO full case
  rpmsg: glink: Remove channel decouple from rpdev release
  rpmsg: glink: Remove the rpmsg dev in close_ack
  rpmsg: glink: Add TX_DATA_CONT command while sending
  rpmsg: virtio_rpmsg_bus: use dev_warn_ratelimited for msg with no recipient
  rpmsg: virtio: Remove unused including <linux/of_device.h>
  rpmsg: Change naming of mediatek rpmsg property
  rpmsg: Fix rpmsg_create_ept return when RPMSG config is not defined
  rpmsg: glink: Replace strncpy() with strscpy_pad()

Merge int340x thermal driver fix for 5.16-rc1.

* thermal-int340x:
  thermal/drivers/int340x: processor_thermal: Suppot 64 bit RFIM responses

Merge operating performance points (OPP) framework updates for and
intel_pstate driver fixes for 5.16-rc1.

* pm-opp:
  dt-bindings: opp: Allow multi-worded OPP entry name
  opp: Fix return in _opp_add_static_v2()
  PM / devfreq: tegra30: Check whether clk_round_rate() returns zero rate
  PM / devfreq: tegra30: Use resource-managed helpers
  PM / devfreq: Add devm_devfreq_add_governor()
  opp: Add more resource-managed variants of dev_pm_opp_of_add_table()
  opp: Change type of dev_pm_opp_attach_genpd(names) argument
  opp: Fix required-opps phandle array count check

* pm-cpufreq:
  cpufreq: intel_pstate: Clear HWP Status during HWP Interrupt enable
  cpufreq: intel_pstate: Fix unchecked MSR 0x773 access
  cpufreq: intel_pstate: Clear HWP desired on suspend/shutdown and offline

Merge assorted fixes and cleanups and one new backlight quirk list
item for 5.16-rc1.

* acpica:
  ACPI: Drop ACPI_USE_BUILTIN_STDARG ifdef from acgcc.h

* acpi-ec:
  ACPI: EC: Remove initialization of static variables to false
  ACPI: EC: Use ec_no_wakeup on HP ZHAN 66 Pro

* acpi-pmic:
  ACPI: PMIC: Fix intel_pmic_regs_handler() read accesses

* acpi-video:
  ACPI: video: use platform backlight driver on Xiaomi Mi Pad 2
  ACPI: video: Drop dmi_system_id.ident settings from video_detect_dmi_table[]

Merge new ACPI device configuration object _DSC support for 5.16-rc1.

* acpi-dsc:
  Documentation: ACPI: Fix non-D0 probe _DSC object example
  at24: Support probing while in non-zero ACPI D state
  media: i2c: imx319: Support device probe in non-zero ACPI D state
  ACPI: Add a convenience function to tell a device is in D0 state
  Documentation: ACPI: Document _DSC object usage for enum power state
  i2c: Allow an ACPI driver to manage the device's power state during probe
  ACPI: scan: Obtain device's desired enumeration power state

The original patch adding the example used _DSC Name when Method was
intended. Fix this.

Also replace spaces used for indentation with tabs in the example.

Fixes: ed66f12b ("Documentation: ACPI: Document _DSC object usage for enum power state")
Reported-by: Bingbu Cao <bingbu.cao@intel.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Pull more block driver updates from Jens Axboe:

 - Last series adding error handling support for add_disk() in drivers.
   After this one, and once the SCSI side has been merged, we can
   finally annotate add_disk() as must_check. (Luis)

 - bcache fixes (Coly)

 - zram fixes (Ming)

 - ataflop locking fix (Tetsuo)

 - nbd fixes (Ye, Yu)

 - MD merge via Song
      - Cleanup (Yang)
      - sysfs fix (Guoqing)

 - Misc fixes (Geert, Wu, luo)

* tag 'for-5.16/drivers-2021-11-09' of git://git.kernel.dk/linux-block: (34 commits)
  bcache: Revert "bcache: use bvec_virt"
  ataflop: Add missing semicolon to return statement
  floppy: address add_disk() error handling on probe
  ataflop: address add_disk() error handling on probe
  block: update __register_blkdev() probe documentation
  ataflop: remove ataflop_probe_lock mutex
  mtd/ubi/block: add error handling support for add_disk()
  block/sunvdc: add error handling support for add_disk()
  z2ram: add error handling support for add_disk()
  nvdimm/pmem: use add_disk() error handling
  nvdimm/pmem: cleanup the disk if pmem_release_disk() is yet assigned
  nvdimm/blk: add error handling support for add_disk()
  nvdimm/blk: avoid calling del_gendisk() on early failures
  nvdimm/btt: add error handling support for add_disk()
  nvdimm/btt: use goto error labels on btt_blk_init()
  loop: Remove duplicate assignments
  drbd: Fix double free problem in drbd_create_device
  nvdimm/btt: do not call del_gendisk() if not needed
  bcache: fix use-after-free problem in bcache_device_free()
  zram: replace fsync_bdev with sync_blockdev
  ...