- 28 Mar, 2020 1 commit
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Thomas Gleixner authored
A recent change to freeze_secondary_cpus() which added an early abort if a wakeup is pending missed the fact that the function is also invoked for shutdown, reboot and kexec via disable_nonboot_cpus(). In case of disable_nonboot_cpus() the wakeup event needs to be ignored as the purpose is to terminate the currently running kernel. Add a 'suspend' argument which is only set when the freeze is in context of a suspend operation. If not set then an eventually pending wakeup event is ignored. Fixes: a66d955e ("cpu/hotplug: Abort disabling secondary CPUs if wakeup is pending") Reported-by:
Boqun Feng <boqun.feng@gmail.com> Signed-off-by:
Thomas Gleixner <tglx@linutronix.de> Cc: Pavankumar Kondeti <pkondeti@codeaurora.org> Cc: stable@vger.kernel.org Link: https://lkml.kernel.org/r/874kuaxdiz.fsf@nanos.tec.linutronix.de
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- 25 Mar, 2020 18 commits
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Qais Yousef authored
Use separate functions for the device core to bring a CPU up and down. Users outside the device core must use add/remove_cpu() which will take care of extra housekeeping work like keeping sysfs in sync. Make cpu_up/down() static and replace the extra layer of indirection. [ tglx: Removed the extra wrapper functions and adjusted function names ] Signed-off-by:
Qais Yousef <qais.yousef@arm.com> Signed-off-by:
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Qais Yousef authored
This is the last direct user of cpu_up() before it can become an internal implementation detail of the cpu subsystem. Signed-off-by:
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Qais Yousef authored
The core device API performs extra housekeeping bits that are missing from directly calling cpu_up/down(). See commit a6717c01 ("powerpc/rtas: use device model APIs and serialization during LPM") for an example description of what might go wrong. This also prepares to make cpu_up/down() a private interface of the CPU subsystem. Signed-off-by:
"Paul E. McKenney" <paulmck@kernel.org> Link: https://lkml.kernel.org/r/20200323135110.30522-16-qais.yousef@arm.com
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Qais Yousef authored
The core device API performs extra housekeeping bits that are missing from directly calling cpu_up/down(). See commit a6717c01 ("powerpc/rtas: use device model APIs and serialization during LPM") for an example description of what might go wrong. This also prepares to make cpu_up/down a private interface of the CPU subsystem. Signed-off-by:
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Qais Yousef authored
The core device API performs extra housekeeping bits that are missing from directly calling cpu_up/down(). See commit a6717c01 ("powerpc/rtas: use device model APIs and serialization during LPM") for an example description of what might go wrong. This also prepares to make cpu_up/down() a private interface of the cpu subsystem. Signed-off-by:
Juergen Gross <jgross@suse.com> Link: https://lkml.kernel.org/r/20200323135110.30522-14-qais.yousef@arm.com
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Qais Yousef authored
The core device API performs extra housekeeping bits that are missing from directly calling cpu_up/down(). See commit a6717c01 ("powerpc/rtas: use device model APIs and serialization during LPM") for an example description of what might go wrong. This also prepares to make cpu_up/down() a private interface of the CPU subsystem. Signed-off-by:
Helge Deller <deller@gmx.de> Link: https://lkml.kernel.org/r/20200323135110.30522-13-qais.yousef@arm.com
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Qais Yousef authored
The core device API performs extra housekeeping bits that are missing from directly calling cpu_up/down(). See commit a6717c01 ("powerpc/rtas: use device model APIs and serialization during LPM") for an example description of what might go wrong. This also prepares to make cpu_up/down() a private interface of the CPU subsystem. Signed-off-by:
David S. Miller <davem@davemloft.net> Link: https://lkml.kernel.org/r/20200323135110.30522-12-qais.yousef@arm.com
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Qais Yousef authored
The core device API performs extra housekeeping bits that are missing from directly calling cpu_up/down. See commit a6717c01 ("powerpc/rtas: use device model APIs and serialization during LPM") for an example description of what might go wrong. This also prepares to make cpu_up/down() a private interface of the CPU subsystem. Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au> Link: https://lkml.kernel.org/r/20200323135110.30522-11-qais.yousef@arm.com
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Qais Yousef authored
The core device API performs extra housekeeping bits that are missing from directly calling cpu_up/down(). See commit a6717c01 ("powerpc/rtas: use device model APIs and serialization during LPM") for an example description of what might go wrong. This also prepares to make cpu_up/down() a private interface of the CPU subsystem. Signed-off-by:
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Qais Yousef authored
Use bringup_hibernate_cpu() instead of open coding it. [ tglx: Split out the core change ] Signed-off-by:
Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will@kernel.org> Link: https://lkml.kernel.org/r/20200323135110.30522-9-qais.yousef@arm.com
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Qais Yousef authored
arm64 uses cpu_up() in the resume from hibernation code to ensure that the CPU on which the system hibernated is online. Provide a core function for this. [ tglx: Split out from the combo arm64 patch ] Signed-off-by:
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Qais Yousef authored
Use `reboot_cpu` variable instead of hardcoding 0 as the reboot cpu in machine_shutdown(). Signed-off-by:
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Qais Yousef authored
disable_nonboot_cpus() is not safe to use when doing machine_down(), because it relies on freeze_secondary_cpus() which in turn is a suspend/resume related freeze and could abort if the logic detects any pending activities that can prevent finishing the offlining process. Beside disable_nonboot_cpus() is dependent on CONFIG_PM_SLEEP_SMP which is an othogonal config to rely on to ensure this function works correctly. Signed-off-by:
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Qais Yousef authored
Use `reboot_cpu` variable instead of hardcoding 0 as the reboot cpu in machine_shutdown(). Signed-off-by:
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Qais Yousef authored
disable_nonboot_cpus() is not safe to use when doing machine_down(), because it relies on freeze_secondary_cpus() which in turn is a suspend/resume related freeze and could abort if the logic detects any pending activities that can prevent finishing the offlining process. Beside disable_nonboot_cpus() is dependent on CONFIG_PM_SLEEP_SMP which is an othogonal config to rely on to ensure this function works correctly. Signed-off-by:
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Qais Yousef authored
Use the new smp_shutdown_nonboot_cpus() instead of using cpu_down() directly. Use reboot_cpu instead of hardcoding the boot CPU to 0. This also prepares to make cpu_up/down() a private interface of the CPU subsystem. Signed-off-by:
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Qais Yousef authored
This function will be used later in machine_shutdown() for some architectures. disable_nonboot_cpus() is not safe to use when doing machine_down(), because it relies on freeze_secondary_cpus() which in turn is a suspend/resume related freeze and could abort if the logic detects any pending activities that can prevent finishing the offlining process. Signed-off-by:
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Qais Yousef authored
The new functions use device_{online,offline}() which are userspace safe. This is in preparation to move cpu_{up, down} kernel users to use a safer interface that is not racy with userspace. Suggested-by:
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- 06 Mar, 2020 3 commits
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Peter Xu authored
Now smp_call_function_single_async() provides the protection that we'll return with -EBUSY if the csd object is still pending, then we don't need the rq.hrtick_csd_pending any more. Signed-off-by:
Peter Xu <peterx@redhat.com> Signed-off-by:
Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by:
Ingo Molnar <mingo@kernel.org> Link: https://lkml.kernel.org/r/20191216213125.9536-4-peterx@redhat.com
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Peter Xu authored
Now smp_call_function_single_async() provides the protection that we'll return with -EBUSY if the csd object is still pending, then we don't need the tick_broadcast_count counter any more. Signed-off-by:
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Peter Xu authored
Previously we will raise an warning if we want to insert a csd object which is with the LOCK flag set, and if it happens we'll also wait for the lock to be released. However, this operation does not match perfectly with how the function is named - the name with "_async" suffix hints that this function should not block, while we will. This patch changed this behavior by simply return -EBUSY instead of waiting, at the meantime we allow this operation to happen without warning the user to change this into a feature when the caller wants to "insert a csd object, if it's there, just wait for that one". This is pretty safe because in flush_smp_call_function_queue() for async csd objects (where csd->flags&SYNC is zero) we'll first do the unlock then we call the csd->func(). So if we see the csd->flags&LOCK is true in smp_call_function_single_async(), then it's guaranteed that csd->func() will be called after this smp_call_function_single_async() returns -EBUSY. Update the comment of the function too to refect this. Signed-off-by:
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- 03 Mar, 2020 1 commit
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git://git.samba.org/sfrench/cifs-2.6Linus Torvalds authored
Pull cifs fixes from Steve French: "Five small cifs/smb3 fixes, two for stable (one for a reconnect problem and the other fixes a use case when renaming an open file)" * tag '5.6-rc4-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6: cifs: Use #define in cifs_dbg cifs: fix rename() by ensuring source handle opened with DELETE bit cifs: add missing mount option to /proc/mounts cifs: fix potential mismatch of UNC paths cifs: don't leak -EAGAIN for stat() during reconnect
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- 02 Mar, 2020 4 commits
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull x86 fixes from Ingo Molnar: "Misc fixes: a pkeys fix for a bug that triggers with weird BIOS settings, and two Xen PV fixes: a paravirt interface fix, and pagetable dumping fix" * 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/mm: Fix dump_pagetables with Xen PV x86/ioperm: Add new paravirt function update_io_bitmap() x86/pkeys: Manually set X86_FEATURE_OSPKE to preserve existing changes
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull scheduler fix from Ingo Molnar: "Fix a scheduler statistics bug" * 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: sched/fair: Fix statistics for find_idlest_group()
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull perf fixes from Ingo Molnar: "No kernel side changes, all tooling fixes plus two tooling cleanups that were committed late in the merge window alongside the perf annotate fixes, delayed by Arnaldo's European trip" * 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (23 commits) perf annotate: Fix segfault with source toggle perf annotate: Align struct annotate_args perf annotate: Simplify disasm_line allocation and freeing code perf annotate: Remove privsize from symbol__annotate() args perf probe: Check return value of strlist__add() for -ENOMEM perf config: Document missing config options perf annotate: Fix perf config option description perf annotate: Prefer cmdline option over default config perf annotate: Make perf config effective perf config: Introduce perf_config_u8() perf annotate: Fix --show-nr-samples for tui/stdio2 perf annotate: Fix --show-total-period for tui/stdio2 perf annotate/tui: Re-render title bar after switching back from script browser tools headers UAPI: Update tools's copy of kvm.h headers tools arch x86: Sync the msr-index.h copy with the kernel sources perf arch powerpc: Sync powerpc syscall.tbl with the kernel sources perf auxtrace: Add auxtrace_record__read_finish() perf arm-spe: Fix endless record after being terminated perf cs-etm: Fix endless record after being terminated perf intel-bts: Fix endless record after being terminated ...
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull EFI fixes from Ingo Molnar: "Three fixes to EFI mixed boot mode, mostly related to x86-64 vmap stacks activated years ago, bug-fixed recently for EFI, which had knock-on effects of various 1:1 mapping assumptions in mixed mode. There's also a READ_ONCE() fix for reading an mmap-ed EFI firmware data field only once, out of caution" * 'efi-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: efi: READ_ONCE rng seed size before munmap efi/x86: Handle by-ref arguments covering multiple pages in mixed mode efi/x86: Remove support for EFI time and counter services in mixed mode efi/x86: Align GUIDs to their size in the mixed mode runtime wrapper
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- 01 Mar, 2020 5 commits
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Linus Torvalds authored
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git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4Linus Torvalds authored
Pull ext4 fixes from Ted Ts'o: "Two more bug fixes (including a regression) for 5.6" * tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: ext4: potential crash on allocation error in ext4_alloc_flex_bg_array() jbd2: fix data races at struct journal_head
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git://git.kernel.org/pub/scm/virt/kvm/kvmLinus Torvalds authored
Pull KVM fixes from Paolo Bonzini: "More bugfixes, including a few remaining "make W=1" issues such as too large frame sizes on some configurations. On the ARM side, the compiler was messing up shadow stacks between EL1 and EL2 code, which is easily fixed with __always_inline" * tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: KVM: VMX: check descriptor table exits on instruction emulation kvm: x86: Limit the number of "kvm: disabled by bios" messages KVM: x86: avoid useless copy of cpufreq policy KVM: allow disabling -Werror KVM: x86: allow compiling as non-module with W=1 KVM: Pre-allocate 1 cpumask variable per cpu for both pv tlb and pv ipis KVM: Introduce pv check helpers KVM: let declaration of kvm_get_running_vcpus match implementation KVM: SVM: allocate AVIC data structures based on kvm_amd module parameter arm64: Ask the compiler to __always_inline functions used by KVM at HYP KVM: arm64: Define our own swab32() to avoid a uapi static inline KVM: arm64: Ask the compiler to __always_inline functions used at HYP kvm: arm/arm64: Fold VHE entry/exit work into kvm_vcpu_run_vhe() KVM: arm/arm64: Fix up includes for trace.h
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Oliver Upton authored
KVM emulates UMIP on hardware that doesn't support it by setting the 'descriptor table exiting' VM-execution control and performing instruction emulation. When running nested, this emulation is broken as KVM refuses to emulate L2 instructions by default. Correct this regression by allowing the emulation of descriptor table instructions if L1 hasn't requested 'descriptor table exiting'. Fixes: 07721fee ("KVM: nVMX: Don't emulate instructions in guest mode") Reported-by:
Jan Kiszka <jan.kiszka@web.de> Cc: stable@vger.kernel.org Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Jim Mattson <jmattson@google.com> Signed-off-by:
Oliver Upton <oupton@google.com> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linuxLinus Torvalds authored
Pull i2c fixes from Wolfram Sang: "I2C has three driver bugfixes for you. We agreed on the Mac regression to go in via I2C" * 'i2c/for-current-fixed' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: macintosh: therm_windtunnel: fix regression when instantiating devices i2c: altera: Fix potential integer overflow i2c: jz4780: silence log flood on txabrt
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- 29 Feb, 2020 7 commits
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Dan Carpenter authored
If sbi->s_flex_groups_allocated is zero and the first allocation fails then this code will crash. The problem is that "i--" will set "i" to -1 but when we compare "i >= sbi->s_flex_groups_allocated" then the -1 is type promoted to unsigned and becomes UINT_MAX. Since UINT_MAX is more than zero, the condition is true so we call kvfree(new_groups[-1]). The loop will carry on freeing invalid memory until it crashes. Fixes: 7c990728 ("ext4: fix potential race between s_flex_groups online resizing and access") Reviewed-by:
Suraj Jitindar Singh <surajjs@amazon.com> Signed-off-by:
Dan Carpenter <dan.carpenter@oracle.com> Cc: stable@kernel.org Link: https://lore.kernel.org/r/20200228092142.7irbc44yaz3by7nb@kili.mountainSigned-off-by:
Theodore Ts'o <tytso@mit.edu>
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Wolfram Sang authored
Removing attach_adapter from this driver caused a regression for at least some machines. Those machines had the sensors described in their DT, too, so they didn't need manual creation of the sensor devices. The old code worked, though, because manual creation came first. Creation of DT devices then failed later and caused error logs, but the sensors worked nonetheless because of the manually created devices. When removing attach_adaper, manual creation now comes later and loses the race. The sensor devices were already registered via DT, yet with another binding, so the driver could not be bound to it. This fix refactors the code to remove the race and only manually creates devices if there are no DT nodes present. Also, the DT binding is updated to match both, the DT and manually created devices. Because we don't know which device creation will be used at runtime, the code to start the kthread is moved to do_probe() which will be called by both methods. Fixes: 3e7bed52 ("macintosh: therm_windtunnel: drop using attach_adapter") Link: https://bugzilla.kernel.org/show_bug.cgi?id=201723Reported-by:
Erhard Furtner <erhard_f@mailbox.org> Tested-by:
Wolfram Sang <wsa@the-dreams.de> Cc: stable@kernel.org # v4.19+
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Qian Cai authored
journal_head::b_transaction and journal_head::b_next_transaction could be accessed concurrently as noticed by KCSAN, LTP: starting fsync04 /dev/zero: Can't open blockdev EXT4-fs (loop0): mounting ext3 file system using the ext4 subsystem EXT4-fs (loop0): mounted filesystem with ordered data mode. Opts: (null) ================================================================== BUG: KCSAN: data-race in __jbd2_journal_refile_buffer [jbd2] / jbd2_write_access_granted [jbd2] write to 0xffff99f9b1bd0e30 of 8 bytes by task 25721 on cpu 70: __jbd2_journal_refile_buffer+0xdd/0x210 [jbd2] __jbd2_journal_refile_buffer at fs/jbd2/transaction.c:2569 jbd2_journal_commit_transaction+0x2d15/0x3f20 [jbd2] (inlined by) jbd2_journal_commit_transaction at fs/jbd2/commit.c:1034 kjournald2+0x13b/0x450 [jbd2] kthread+0x1cd/0x1f0 ret_from_fork+0x27/0x50 read to 0xffff99f9b1bd0e30 of 8 bytes by task 25724 on cpu 68: jbd2_write_access_granted+0x1b2/0x250 [jbd2] jbd2_write_access_granted at fs/jbd2/transaction.c:1155 jbd2_journal_get_write_access+0x2c/0x60 [jbd2] __ext4_journal_get_write_access+0x50/0x90 [ext4] ext4_mb_mark_diskspace_used+0x158/0x620 [ext4] ext4_mb_new_blocks+0x54f/0xca0 [ext4] ext4_ind_map_blocks+0xc79/0x1b40 [ext4] ext4_map_blocks+0x3b4/0x950 [ext4] _ext4_get_block+0xfc/0x270 [ext4] ext4_get_block+0x3b/0x50 [ext4] __block_write_begin_int+0x22e/0xae0 __block_write_begin+0x39/0x50 ext4_write_begin+0x388/0xb50 [ext4] generic_perform_write+0x15d/0x290 ext4_buffered_write_iter+0x11f/0x210 [ext4] ext4_file_write_iter+0xce/0x9e0 [ext4] new_sync_write+0x29c/0x3b0 __vfs_write+0x92/0xa0 vfs_write+0x103/0x260 ksys_write+0x9d/0x130 __x64_sys_write+0x4c/0x60 do_syscall_64+0x91/0xb05 entry_SYSCALL_64_after_hwframe+0x49/0xbe 5 locks held by fsync04/25724: #0: ffff99f9911093f8 (sb_writers#13){.+.+}, at: vfs_write+0x21c/0x260 #1: ffff99f9db4c0348 (&sb->s_type->i_mutex_key#15){+.+.}, at: ext4_buffered_write_iter+0x65/0x210 [ext4] #2: ffff99f5e7dfcf58 (jbd2_handle){++++}, at: start_this_handle+0x1c1/0x9d0 [jbd2] #3: ffff99f9db4c0168 (&ei->i_data_sem){++++}, at: ext4_map_blocks+0x176/0x950 [ext4] #4: ffffffff99086b40 (rcu_read_lock){....}, at: jbd2_write_access_granted+0x4e/0x250 [jbd2] irq event stamp: 1407125 hardirqs last enabled at (1407125): [<ffffffff980da9b7>] __find_get_block+0x107/0x790 hardirqs last disabled at (1407124): [<ffffffff980da8f9>] __find_get_block+0x49/0x790 softirqs last enabled at (1405528): [<ffffffff98a0034c>] __do_softirq+0x34c/0x57c softirqs last disabled at (1405521): [<ffffffff97cc67a2>] irq_exit+0xa2/0xc0 Reported by Kernel Concurrency Sanitizer on: CPU: 68 PID: 25724 Comm: fsync04 Tainted: G L 5.6.0-rc2-next-20200221+ #7 Hardware name: HPE ProLiant DL385 Gen10/ProLiant DL385 Gen10, BIOS A40 07/10/2019 The plain reads are outside of jh->b_state_lock critical section which result in data races. Fix them by adding pairs of READ|WRITE_ONCE(). Reviewed-by:Jan Kara <jack@suse.cz> Signed-off-by:
Qian Cai <cai@lca.pw> Link: https://lore.kernel.org/r/20200222043111.2227-1-cai@lca.pwSigned-off-by:
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git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsiLinus Torvalds authored
Pull SCSI fixes from James Bottomley: "Four small fixes. Three are in drivers for fairly obvious bugs. The fourth is a set of regressions introduced by the compat_ioctl changes because some of the compat updates wrongly replaced .ioctl instead of .compat_ioctl" * tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: scsi: compat_ioctl: cdrom: Replace .ioctl with .compat_ioctl in four appropriate places scsi: zfcp: fix wrong data and display format of SFP+ temperature scsi: sd_sbc: Fix sd_zbc_report_zones() scsi: libfc: free response frame from GPN_ID
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Juergen Gross authored
Commit 2ae27137 ("x86: mm: convert dump_pagetables to use walk_page_range") broke Xen PV guests as the hypervisor reserved hole in the memory map was not taken into account. Fix that by starting the kernel range only at GUARD_HOLE_END_ADDR. Fixes: 2ae27137 ("x86: mm: convert dump_pagetables to use walk_page_range") Reported-by:
Julien Grall <julien@xen.org> Signed-off-by:
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Juergen Gross authored
Commit 111e7b15 ("x86/ioperm: Extend IOPL config to control ioperm() as well") reworked the iopl syscall to use I/O bitmaps. Unfortunately this broke Xen PV domains using that syscall as there is currently no I/O bitmap support in PV domains. Add I/O bitmap support via a new paravirt function update_io_bitmap which Xen PV domains can use to update their I/O bitmaps via a hypercall. Fixes: 111e7b15 ("x86/ioperm: Extend IOPL config to control ioperm() as well") Reported-by:
Jan Beulich <jbeulich@suse.com> Signed-off-by:
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Ingo Molnar authored
Merge tag 'perf-urgent-for-mingo-5.6-20200228' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/urgent Pull perf/urgent fixes from Arnaldo Carvalho de Melo: perf annotate: Ravi Bangoria: - Fix segfault with source toggle. - Fix --show-total-period and --show-nr-samples for tui/stdio2. - Fix handling of settings in ~/.perfconfig versus the ones passed in the command line - Re-render title bar after switching back from script browser. - Fix options man page, document some missing ones. perf probe: He Zhe: - Check return value of strlist__add() for -ENOMEM. tools UAPI: Arnaldo Carvalho de Melo: - Sync x86's msr-index.h copy with the kernel sources. - Update tools's copy of x86's kvm.h headers. Signed-off-by:
Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by:
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- 28 Feb, 2020 1 commit
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git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pciLinus Torvalds authored
Pull PCI fixes from Bjorn Helgaas: - Fix build issue on 32-bit ARM with old compilers (Marek Szyprowski) - Update MAINTAINERS for recent Cadence driver file move (Lukas Bulwahn) * tag 'pci-v5.6-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci: MAINTAINERS: Correct Cadence PCI driver path PCI: brcmstb: Fix build on 32bit ARM platforms with older compilers
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