1. 24 Apr, 2021 16 commits
    • Masahiro Yamada's avatar
      kbuild: generate Module.symvers only when vmlinux exists · 69bc8d38
      Masahiro Yamada authored
      The external module build shows the following warning if Module.symvers
      is missing in the kernel tree.
      
        WARNING: Symbol version dump "Module.symvers" is missing.
                 Modules may not have dependencies or modversions.
      
      I think this is an important heads-up because the resulting modules may
      not work as expected. This happens when you did not build the entire
      kernel tree, for example, you might have prepared the minimal setups
      for external modules by 'make defconfig && make modules_preapre'.
      
      A problem is that 'make modules' creates Module.symvers even without
      vmlinux. In this case, that warning is suppressed since Module.symvers
      already exists in spite of its incomplete content.
      
      The incomplete (i.e. invalid) Module.symvers should not be created.
      
      This commit changes the second pass of modpost to dump symbols into
      modules-only.symvers. The final Module.symvers is created by
      concatenating vmlinux.symvers and modules-only.symvers if both exist.
      
      Module.symvers is supposed to collect symbols from both vmlinux and
      modules. It might be a bit confusing, and I am not quite sure if it
      is an official interface, but presumably it is difficult to rename it
      because some tools (e.g. kmod) parse it.
      Signed-off-by: default avatarMasahiro Yamada <masahiroy@kernel.org>
      69bc8d38
    • Masahiro Yamada's avatar
      arm64: move --fix-cortex-a53-843419 linker test to Kconfig · 987fdfec
      Masahiro Yamada authored
      Since commit 805b2e1d ("kbuild: include Makefile.compiler only when
      compiler is needed"), "make ARCH=arm64 (modules_)install" shows a false
      positive warning.
      
      Move the ld-option test to Kconfig, so that the result can be stored in
      the .config file, avoiding multiple-time evaluations in the build and
      installation time.
      Reported-by: default avatarNathan Chancellor <nathan@kernel.org>
      Signed-off-by: default avatarMasahiro Yamada <masahiroy@kernel.org>
      Acked-by: default avatarWill Deacon <will@kernel.org>
      Tested-by: default avatarNathan Chancellor <nathan@kernel.org>
      Reviewed-by: default avatarNathan Chancellor <nathan@kernel.org>
      987fdfec
    • Masahiro Yamada's avatar
      kbuild: dwarf: use AS_VERSION instead of test_dwarf5_support.sh · 2e988157
      Masahiro Yamada authored
      The test code in scripts/test_dwarf5_support.sh is somewhat difficult
      to understand, but after all, we want to check binutils >= 2.35.2
      
      From the former discussion, the requirement for generating DWARF v5 from
      C code is as follows:
      
       - gcc + gnu as          -> requires gcc 5.0+ (but 7.0+ for full support)
       - clang + gnu as        -> requires binutils 2.35.2+
       - clang + integrated as -> OK
      Signed-off-by: default avatarMasahiro Yamada <masahiroy@kernel.org>
      Reviewed-by: default avatarNathan Chancellor <nathan@kernel.org>
      Reviewed-by: default avatarNick Desaulniers <ndesaulniers@google.com>
      2e988157
    • Masahiro Yamada's avatar
      kbuild: check the minimum assembler version in Kconfig · ba64beb1
      Masahiro Yamada authored
      Documentation/process/changes.rst defines the minimum assembler version
      (binutils version), but we have never checked it in the build time.
      
      Kbuild never invokes 'as' directly because all assembly files in the
      kernel tree are *.S, hence must be preprocessed. I do not expect
      raw assembly source files (*.s) would be added to the kernel tree.
      
      Therefore, we always use $(CC) as the assembler driver, and commit
      aa824e0c ("kbuild: remove AS variable") removed 'AS'. However,
      we are still interested in the version of the assembler acting behind.
      
      As usual, the --version option prints the version string.
      
        $ as --version | head -n 1
        GNU assembler (GNU Binutils for Ubuntu) 2.35.1
      
      But, we do not have $(AS). So, we can add the -Wa prefix so that
      $(CC) passes --version down to the backing assembler.
      
        $ gcc -Wa,--version | head -n 1
        gcc: fatal error: no input files
        compilation terminated.
      
      OK, we need to input something to satisfy gcc.
      
        $ gcc -Wa,--version -c -x assembler /dev/null -o /dev/null | head -n 1
        GNU assembler (GNU Binutils for Ubuntu) 2.35.1
      
      The combination of Clang and GNU assembler works in the same way:
      
        $ clang -no-integrated-as -Wa,--version -c -x assembler /dev/null -o /dev/null | head -n 1
        GNU assembler (GNU Binutils for Ubuntu) 2.35.1
      
      Clang with the integrated assembler fails like this:
      
        $ clang -integrated-as -Wa,--version -c -x assembler /dev/null -o /dev/null | head -n 1
        clang: error: unsupported argument '--version' to option 'Wa,'
      
      For the last case, checking the error message is fragile. If the
      proposal for -Wa,--version support [1] is accepted, this may not be
      even an error in the future.
      
      One easy way is to check if -integrated-as is present in the passed
      arguments. We did not pass -integrated-as to CLANG_FLAGS before, but
      we can make it explicit.
      
      Nathan pointed out -integrated-as is the default for all of the
      architectures/targets that the kernel cares about, but it goes
      along with "explicit is better than implicit" policy. [2]
      
      With all this in my mind, I implemented scripts/as-version.sh to
      check the assembler version in Kconfig time.
      
        $ scripts/as-version.sh gcc
        GNU 23501
        $ scripts/as-version.sh clang -no-integrated-as
        GNU 23501
        $ scripts/as-version.sh clang -integrated-as
        LLVM 0
      
      [1]: https://github.com/ClangBuiltLinux/linux/issues/1320
      [2]: https://lore.kernel.org/linux-kbuild/20210307044253.v3h47ucq6ng25iay@archlinux-ax161/Signed-off-by: default avatarMasahiro Yamada <masahiroy@kernel.org>
      Reviewed-by: default avatarNathan Chancellor <nathan@kernel.org>
      ba64beb1
    • Masahiro Yamada's avatar
      kbuild: collect minimum tool versions into scripts/min-tool-version.sh · e24b3ffc
      Masahiro Yamada authored
      The kernel build uses various tools, many of which are provided by the
      same software suite, for example, LLVM and Binutils.
      
      When you raise the minimum version of Clang/LLVM, you need to update
      clang_min_version in scripts/cc-version.sh and also lld_min_version in
      scripts/ld-version.sh.
      
      Kbuild can handle CC=clang and LD=ld.lld independently, but it does not
      make much sense to maintain their versions separately.
      
      Let's create a central place of minimum tool versions so you do not need
      to touch multiple files. scripts/min-tool-version.sh prints the minimum
      version of the given tool.
      Signed-off-by: default avatarMasahiro Yamada <masahiroy@kernel.org>
      Reviewed-by: default avatarNathan Chancellor <nathan@kernel.org>
      Acked-by: default avatarMiguel Ojeda <ojeda@kernel.org>
      Tested-by: default avatarSedat Dilek <sedat.dilek@gmail.com>
      e24b3ffc
    • Masahiro Yamada's avatar
      kbuild: replace sed with $(subst ) or $(patsubst ) · 6e0839fd
      Masahiro Yamada authored
      For simple text replacement, it is better to use a built-in function
      instead of sed if possible. You can save one process forking.
      
      I do not mean to replace all sed invocations because GNU Make itself
      does not support regular expression (unless you use guile).
      
      I just replaced simple ones.
      Signed-off-by: default avatarMasahiro Yamada <masahiroy@kernel.org>
      6e0839fd
    • Bhaskar Chowdhury's avatar
    • Nathan Chancellor's avatar
      Makefile: Only specify '--prefix=' when building with clang + GNU as · eec08090
      Nathan Chancellor authored
      When building with LLVM_IAS=1, there is no point to specifying
      '--prefix=' because that flag is only used to find GNU cross tools,
      which will not be used indirectly when using the integrated assembler.
      All of the tools are invoked directly from PATH or a full path specified
      via the command line, which does not depend on the value of '--prefix='.
      
      Sharing commands to reproduce issues becomes a little bit easier without
      a '--prefix=' value because that '--prefix=' value is specific to a
      user's machine due to it being an absolute path.
      
      Some further notes from Fangrui Song:
      
        clang can spawn GNU as (if -f?no-integrated-as is specified) and GNU
        objcopy (-f?no-integrated-as and -gsplit-dwarf and -g[123]).
        objcopy is only used for GNU as assembled object files.
        With integrated assembler, the object file streamer creates .o and
        .dwo simultaneously.
        With GNU as, two objcopy commands are needed to extract .debug*.dwo to
        .dwo files && another command to remove .debug*.dwo sections.
      
      A small consequence of this change (to keep things simple) is that
      '--prefix=' will always be specified now, even with a native build, when
      it was not before. This should not be an issue due to the way that the
      Makefile searches for the prefix (based on elfedit's location). This
      ends up improving the experience for host builds because PATH is better
      respected and matches GCC's behavior more closely. See the below thread
      for more details:
      
      https://lore.kernel.org/r/20210205213651.GA16907@Ryzen-5-4500U.localdomain/Signed-off-by: default avatarNathan Chancellor <nathan@kernel.org>
      Signed-off-by: default avatarMasahiro Yamada <masahiroy@kernel.org>
      eec08090
    • Nathan Chancellor's avatar
      Makefile: Remove '--gcc-toolchain' flag · c91d4e47
      Nathan Chancellor authored
      This flag was originally added to allow clang to find the GNU cross
      tools in commit 785f11aa ("kbuild: Add better clang cross build
      support"). This flag was not enough to find the tools at times so
      '--prefix' was added to the list in commit ef8c4ed9 ("kbuild: allow
      to use GCC toolchain not in Clang search path") and improved upon in
      commit ca9b31f6 ("Makefile: Fix GCC_TOOLCHAIN_DIR prefix for Clang
      cross compilation"). Now that '--prefix' specifies a full path and
      prefix, '--gcc-toolchain' serves no purpose because the kernel builds
      with '-nostdinc' and '-nostdlib'.
      
      This has been verified with self compiled LLVM 10.0.1 and LLVM 13.0.0 as
      well as a distribution version of LLVM 11.1.0 without binutils in the
      LLVM toolchain locations.
      
      Link: https://reviews.llvm.org/D97902Signed-off-by: default avatarNathan Chancellor <nathan@kernel.org>
      Reviewed-by: default avatarFangrui Song <maskray@google.com>
      Reviewed-by: default avatarNick Desaulniers <ndesaulniers@google.com>
      Tested-by: default avatarNick Desaulniers <ndesaulniers@google.com>
      Tested-by: default avatarSedat Dilek <sedat.dilek@gmail.com>
      Signed-off-by: default avatarMasahiro Yamada <masahiroy@kernel.org>
      c91d4e47
    • Masahiro Yamada's avatar
      kbuild: move $(strip ) to suffix-search definition · a34e6d1e
      Masahiro Yamada authored
      Move $(strip ...) to the callee from the callers of suffix-search. It
      shortens the code slightly. Adding a space after a comma will not be
      a matter. I also dropped parentheses from single character variables.
      Signed-off-by: default avatarMasahiro Yamada <masahiroy@kernel.org>
      a34e6d1e
    • Masahiro Yamada's avatar
      kbuild: rename multi-used-* to multi-obj-* · a6601e01
      Masahiro Yamada authored
      I think multi-obj-* is clearer, and more consistent with real-obj-*.
      
      Rename as follows:
      
        multi-used-y  ->  multi-obj-y
        multi-used-m  ->  multi-obj-m
        multi-used    ->  multi-obj-ym
      Signed-off-by: default avatarMasahiro Yamada <masahiroy@kernel.org>
      a6601e01
    • Rasmus Villemoes's avatar
      kbuild: apply fixdep logic to link-vmlinux.sh · 0b956e20
      Rasmus Villemoes authored
      The patch adding CONFIG_VMLINUX_MAP revealed a small defect in the
      build system: link-vmlinux.sh takes decisions based on CONFIG_*
      options, but changing one of those does not always lead to vmlinux
      being linked again.
      
      For most of the CONFIG_* knobs referenced previously, this has
      probably been hidden by those knobs also affecting some object file,
      hence indirectly also vmlinux.
      
      But CONFIG_VMLINUX_MAP is only handled inside link-vmlinux.sh, and
      changing CONFIG_VMLINUX_MAP=n to CONFIG_VMLINUX_MAP=y does not cause
      the build system to re-link (and hence have vmlinux.map
      emitted). Since that map file is mostly a debugging aid, this is
      merely a nuisance which is easily worked around by just deleting
      vmlinux and building again.
      
      But one could imagine other (possibly future) CONFIG options that
      actually do affect the vmlinux binary but which are not captured
      through some object file dependency.
      
      To fix this, make link-vmlinux.sh emit a .vmlinux.d file in the same
      format as the dependency files generated by gcc, and apply the fixdep
      logic to that. I've tested that this correctly works with both in-tree
      and out-of-tree builds.
      Signed-off-by: default avatarRasmus Villemoes <linux@rasmusvillemoes.dk>
      Signed-off-by: default avatarMasahiro Yamada <masahiroy@kernel.org>
      0b956e20
    • Rasmus Villemoes's avatar
      kbuild: add CONFIG_VMLINUX_MAP expert option · 5cc12472
      Rasmus Villemoes authored
      It can be quite useful to have ld emit a link map file, in order to
      debug or verify that special sections end up where they are supposed
      to, and to see what LD_DEAD_CODE_DATA_ELIMINATION manages to get rid
      of.
      
      The only reason I'm not just adding this unconditionally is that the
      .map file can be rather large (several MB), and that's a waste of
      space when one isn't interested in these things. Also make it depend
      on CONFIG_EXPERT.
      Signed-off-by: default avatarRasmus Villemoes <linux@rasmusvillemoes.dk>
      Signed-off-by: default avatarMasahiro Yamada <masahiroy@kernel.org>
      5cc12472
    • Masahiro Yamada's avatar
      kbuild: show warning if 'make headers_check' is used · 609bbb4d
      Masahiro Yamada authored
      Since commit 7ecaf069 ("kbuild: move headers_check rule to
      usr/include/Makefile"), 'make headers_check' is no-op.
      
      This stub target is remaining here in case some scripts still invoke it.
      In order to prompt people to remove stale code, show a noisy warning
      message if used. The stub will be really removed after the Linux 5.15
      release.
      Signed-off-by: default avatarMasahiro Yamada <masahiroy@kernel.org>
      609bbb4d
    • Masahiro Yamada's avatar
      kbuild: include Makefile.compiler only when compiler is needed · 805b2e1d
      Masahiro Yamada authored
      Since commit f2f02ebd ("kbuild: improve cc-option to clean up all
      temporary files"), running 'make kernelversion' in a read-only source
      tree emits a bunch of warnings:
      
        mkdir: cannot create directory '.tmp_12345': Permission denied
      
      No-build targets such as kernelversion, clean, help, etc. do not
      need to evaluate $(call cc-option,) or friends. Skip Makefile.compiler
      so $(call cc-option,) becomes no-op.
      
      This not only fixes the warnings, but also runs non-build targets much
      faster.
      
      Basically, all installation targets should also be non-build targets.
      Unfortunately, vdso_install requires the compiler because it builds
      vdso before installation. This is a problem that must be fixed by a
      separate patch.
      Reported-by: default avatarIsrael Tsadok <itsadok@gmail.com>
      Signed-off-by: default avatarMasahiro Yamada <masahiroy@kernel.org>
      805b2e1d
    • Masahiro Yamada's avatar
      kbuild: split cc-option and friends to scripts/Makefile.compiler · 57fd251c
      Masahiro Yamada authored
      scripts/Kbuild.include is included everywhere, but macros such as
      cc-option are needed by build targets only.
      
      For example, when 'make clean' traverses the tree, it does not need
      to evaluate $(call cc-option,).
      
      Split cc-option, ld-option, etc. to scripts/Makefile.compiler, which
      is only included from the top Makefile and scripts/Makefile.build.
      Signed-off-by: default avatarMasahiro Yamada <masahiroy@kernel.org>
      57fd251c
  2. 15 Mar, 2021 1 commit
    • Masahiro Yamada's avatar
      kbuild: prefix $(srctree)/ to some included Makefiles · 3204a7fb
      Masahiro Yamada authored
      VPATH is used in Kbuild to make pattern rules search for prerequisites
      in both $(objtree) and $(srctree). Some of *.c, *.S files are not real
      sources, but generated by tools such as flex, bison, perl.
      
      In contrast, I doubt the benefit of --include-dir=$(abs_srctree) because
      it is always clear which Makefiles are real sources, and which are not.
      
      So, my hope is to add $(srctree)/ prefix to all check-in Makefiles,
      then remove --include-dir=$(abs_srctree) flag in the future.
      
      I am touching only some Kbuild core parts for now. Treewide fixes will
      be needed to achieve this goal.
      Signed-off-by: default avatarMasahiro Yamada <masahiroy@kernel.org>
      3204a7fb
  3. 14 Mar, 2021 14 commits
    • Linus Torvalds's avatar
      Linux 5.12-rc3 · 1e28eed1
      Linus Torvalds authored
      1e28eed1
    • Alexey Dobriyan's avatar
      prctl: fix PR_SET_MM_AUXV kernel stack leak · c995f12a
      Alexey Dobriyan authored
      Doing a
      
      	prctl(PR_SET_MM, PR_SET_MM_AUXV, addr, 1);
      
      will copy 1 byte from userspace to (quite big) on-stack array
      and then stash everything to mm->saved_auxv.
      AT_NULL terminator will be inserted at the very end.
      
      /proc/*/auxv handler will find that AT_NULL terminator
      and copy original stack contents to userspace.
      
      This devious scheme requires CAP_SYS_RESOURCE.
      Signed-off-by: default avatarAlexey Dobriyan <adobriyan@gmail.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      c995f12a
    • Linus Torvalds's avatar
      Merge tag 'irq-urgent-2021-03-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 70404fe3
      Linus Torvalds authored
      Pull irq fixes from Thomas Gleixner:
       "A set of irqchip updates:
      
         - Make the GENERIC_IRQ_MULTI_HANDLER configuration correct
      
         - Add a missing DT compatible string for the Ingenic driver
      
         - Remove the pointless debugfs_file pointer from struct irqdomain"
      
      * tag 'irq-urgent-2021-03-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        irqchip/ingenic: Add support for the JZ4760
        dt-bindings/irq: Add compatible string for the JZ4760B
        irqchip: Do not blindly select CONFIG_GENERIC_IRQ_MULTI_HANDLER
        ARM: ep93xx: Select GENERIC_IRQ_MULTI_HANDLER directly
        irqdomain: Remove debugfs_file from struct irq_domain
      70404fe3
    • Linus Torvalds's avatar
      Merge tag 'timers-urgent-2021-03-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 802b31c0
      Linus Torvalds authored
      Pull timer fix from Thomas Gleixner:
       "A single fix in for hrtimers to prevent an interrupt storm caused by
        the lack of reevaluation of the timers which expire in softirq context
        under certain circumstances, e.g. when the clock was set"
      
      * tag 'timers-urgent-2021-03-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        hrtimer: Update softirq_expires_next correctly after __hrtimer_get_next_event()
      802b31c0
    • Linus Torvalds's avatar
      Merge tag 'sched-urgent-2021-03-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · c72cbc93
      Linus Torvalds authored
      Pull scheduler fixes from Thomas Gleixner:
       "A set of scheduler updates:
      
         - Prevent a NULL pointer dereference in the migration_stop_cpu()
           mechanims
      
         - Prevent self concurrency of affine_move_task()
      
         - Small fixes and cleanups related to task migration/affinity setting
      
         - Ensure that sync_runqueues_membarrier_state() is invoked on the
           current CPU when it is in the cpu mask"
      
      * tag 'sched-urgent-2021-03-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        sched/membarrier: fix missing local execution of ipi_sync_rq_state()
        sched: Simplify set_affinity_pending refcounts
        sched: Fix affine_move_task() self-concurrency
        sched: Optimize migration_cpu_stop()
        sched: Collate affine_move_task() stoppers
        sched: Simplify migration_cpu_stop()
        sched: Fix migration_cpu_stop() requeueing
      c72cbc93
    • Linus Torvalds's avatar
      Merge tag 'objtool-urgent-2021-03-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 19469d2a
      Linus Torvalds authored
      Pull objtool fix from Thomas Gleixner:
       "A single objtool fix to handle the PUSHF/POPF validation correctly for
        the paravirt changes which modified arch_local_irq_restore not to use
        popf"
      
      * tag 'objtool-urgent-2021-03-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        objtool,x86: Fix uaccess PUSHF/POPF validation
      19469d2a
    • Linus Torvalds's avatar
      Merge tag 'locking-urgent-2021-03-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · fa509ff8
      Linus Torvalds authored
      Pull locking fixes from Thomas Gleixner:
       "A couple of locking fixes:
      
         - A fix for the static_call mechanism so it handles unaligned
           addresses correctly.
      
         - Make u64_stats_init() a macro so every instance gets a seperate
           lockdep key.
      
         - Make seqcount_latch_init() a macro as well to preserve the static
           variable which is used for the lockdep key"
      
      * tag 'locking-urgent-2021-03-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        seqlock,lockdep: Fix seqcount_latch_init()
        u64_stats,lockdep: Fix u64_stats_init() vs lockdep
        static_call: Fix the module key fixup
      fa509ff8
    • Linus Torvalds's avatar
      Merge tag 'perf_urgent_for_v5.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 75013c6c
      Linus Torvalds authored
      Pull perf fixes from Borislav Petkov:
      
       - Make sure PMU internal buffers are flushed for per-CPU events too and
         properly handle PID/TID for large PEBS.
      
       - Handle the case properly when there's no PMU and therefore return an
         empty list of perf MSRs for VMX to switch instead of reading random
         garbage from the stack.
      
      * tag 'perf_urgent_for_v5.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        x86/perf: Use RET0 as default for guest_get_msrs to handle "no PMU" case
        perf/x86/intel: Set PERF_ATTACH_SCHED_CB for large PEBS and LBR
        perf/core: Flush PMU internal buffers for per-CPU events
      75013c6c
    • Linus Torvalds's avatar
      Merge tag 'efi-urgent-for-v5.12-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 836d7f05
      Linus Torvalds authored
      Pull EFI fix from Ard Biesheuvel via Borislav Petkov:
       "Fix an oversight in the handling of EFI_RT_PROPERTIES_TABLE, which was
        added v5.10, but failed to take the SetVirtualAddressMap() RT service
        into account"
      
      * tag 'efi-urgent-for-v5.12-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        efi: stub: omit SetVirtualAddressMap() if marked unsupported in RT_PROP table
      836d7f05
    • Linus Torvalds's avatar
      Merge tag 'x86_urgent_for_v5.12_rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 0a7c10df
      Linus Torvalds authored
      Pull x86 fixes from Borislav Petkov:
      
       - A couple of SEV-ES fixes and robustifications: verify usermode stack
         pointer in NMI is not coming from the syscall gap, correctly track
         IRQ states in the #VC handler and access user insn bytes atomically
         in same handler as latter cannot sleep.
      
       - Balance 32-bit fast syscall exit path to do the proper work on exit
         and thus not confuse audit and ptrace frameworks.
      
       - Two fixes for the ORC unwinder going "off the rails" into KASAN
         redzones and when ORC data is missing.
      
      * tag 'x86_urgent_for_v5.12_rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        x86/sev-es: Use __copy_from_user_inatomic()
        x86/sev-es: Correctly track IRQ states in runtime #VC handler
        x86/sev-es: Check regs->sp is trusted before adjusting #VC IST stack
        x86/sev-es: Introduce ip_within_syscall_gap() helper
        x86/entry: Fix entry/exit mismatch on failed fast 32-bit syscalls
        x86/unwind/orc: Silence warnings caused by missing ORC data
        x86/unwind/orc: Disable KASAN checking in the ORC unwinder, part 2
      0a7c10df
    • Linus Torvalds's avatar
      Merge tag 'powerpc-5.12-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux · c3c7579f
      Linus Torvalds authored
      Pull powerpc fixes from Michael Ellerman:
       "Some more powerpc fixes for 5.12:
      
         - Fix wrong instruction encoding for lis in ppc_function_entry(),
           which could potentially lead to missed kprobes.
      
         - Fix SET_FULL_REGS on 32-bit and 64e, which prevented ptrace of
           non-volatile GPRs immediately after exec.
      
         - Clean up a missed SRR specifier in the recent interrupt rework.
      
         - Don't treat unrecoverable_exception() as an interrupt handler, it's
           called from other handlers so shouldn't do the interrupt entry/exit
           accounting itself.
      
         - Fix build errors caused by missing declarations for
           [en/dis]able_kernel_vsx().
      
        Thanks to Christophe Leroy, Daniel Axtens, Geert Uytterhoeven, Jiri
        Olsa, Naveen N. Rao, and Nicholas Piggin"
      
      * tag 'powerpc-5.12-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
        powerpc/traps: unrecoverable_exception() is not an interrupt handler
        powerpc: Fix missing declaration of [en/dis]able_kernel_vsx()
        powerpc/64s/exception: Clean up a missed SRR specifier
        powerpc: Fix inverted SET_FULL_REGS bitop
        powerpc/64s: Use symbolic macros for function entry encoding
        powerpc/64s: Fix instruction encoding for lis in ppc_function_entry()
      c3c7579f
    • Linus Torvalds's avatar
      Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm · 9d0c8e79
      Linus Torvalds authored
      Pull KVM fixes from Paolo Bonzini:
       "More fixes for ARM and x86"
      
      * tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
        KVM: LAPIC: Advancing the timer expiration on guest initiated write
        KVM: x86/mmu: Skip !MMU-present SPTEs when removing SP in exclusive mode
        KVM: kvmclock: Fix vCPUs > 64 can't be online/hotpluged
        kvm: x86: annotate RCU pointers
        KVM: arm64: Fix exclusive limit for IPA size
        KVM: arm64: Reject VM creation when the default IPA size is unsupported
        KVM: arm64: Ensure I-cache isolation between vcpus of a same VM
        KVM: arm64: Don't use cbz/adr with external symbols
        KVM: arm64: Fix range alignment when walking page tables
        KVM: arm64: Workaround firmware wrongly advertising GICv2-on-v3 compatibility
        KVM: arm64: Rename __vgic_v3_get_ich_vtr_el2() to __vgic_v3_get_gic_config()
        KVM: arm64: Don't access PMSELR_EL0/PMUSERENR_EL0 when no PMU is available
        KVM: arm64: Turn kvm_arm_support_pmu_v3() into a static key
        KVM: arm64: Fix nVHE hyp panic host context restore
        KVM: arm64: Avoid corrupting vCPU context register in guest exit
        KVM: arm64: nvhe: Save the SPE context early
        kvm: x86: use NULL instead of using plain integer as pointer
        KVM: SVM: Connect 'npt' module param to KVM's internal 'npt_enabled'
        KVM: x86: Ensure deadline timer has truly expired before posting its IRQ
      9d0c8e79
    • Linus Torvalds's avatar
      Merge branch 'akpm' (patches from Andrew) · 50eb842f
      Linus Torvalds authored
      Merge misc fixes from Andrew Morton:
       "28 patches.
      
        Subsystems affected by this series: mm (memblock, pagealloc, hugetlb,
        highmem, kfence, oom-kill, madvise, kasan, userfaultfd, memcg, and
        zram), core-kernel, kconfig, fork, binfmt, MAINTAINERS, kbuild, and
        ia64"
      
      * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (28 commits)
        zram: fix broken page writeback
        zram: fix return value on writeback_store
        mm/memcg: set memcg when splitting page
        mm/memcg: rename mem_cgroup_split_huge_fixup to split_page_memcg and add nr_pages argument
        ia64: fix ptrace(PTRACE_SYSCALL_INFO_EXIT) sign
        ia64: fix ia64_syscall_get_set_arguments() for break-based syscalls
        mm/userfaultfd: fix memory corruption due to writeprotect
        kasan: fix KASAN_STACK dependency for HW_TAGS
        kasan, mm: fix crash with HW_TAGS and DEBUG_PAGEALLOC
        mm/madvise: replace ptrace attach requirement for process_madvise
        include/linux/sched/mm.h: use rcu_dereference in in_vfork()
        kfence: fix reports if constant function prefixes exist
        kfence, slab: fix cache_alloc_debugcheck_after() for bulk allocations
        kfence: fix printk format for ptrdiff_t
        linux/compiler-clang.h: define HAVE_BUILTIN_BSWAP*
        MAINTAINERS: exclude uapi directories in API/ABI section
        binfmt_misc: fix possible deadlock in bm_register_write
        mm/highmem.c: fix zero_user_segments() with start > end
        hugetlb: do early cow when page pinned on src mm
        mm: use is_cow_mapping() across tree where proper
        ...
      50eb842f
    • Thomas Gleixner's avatar
      Merge tag 'irqchip-fixes-5.12-1' of... · b470ebc9
      Thomas Gleixner authored
      Merge tag 'irqchip-fixes-5.12-1' of git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms into irq/urgent
      
      Pull irqchip fixes from Marc Zyngier:
      
        - More compatible strings for the Ingenic irqchip (introducing the
          JZ4760B SoC)
        - Select GENERIC_IRQ_MULTI_HANDLER on the ARM ep93xx platform
        - Drop all GENERIC_IRQ_MULTI_HANDLER selections from the irqchip
          Kconfig, now relying on the architecture to get it right
        - Drop the debugfs_file field from struct irq_domain, now that
          debugfs can track things on its own
      b470ebc9
  4. 13 Mar, 2021 9 commits
    • Linus Torvalds's avatar
      Merge tag 'char-misc-5.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc · 88fe4924
      Linus Torvalds authored
      Pull char/misc driver fixes from Greg KH:
       "Here are some small misc/char driver fixes to resolve some reported
        problems:
      
         - habanalabs driver fixes
      
         - Acrn build fixes (reported many times)
      
         - pvpanic module table export fix
      
        All of these have been in linux-next for a while with no reported
        issues"
      
      * tag 'char-misc-5.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc:
        misc/pvpanic: Export module FDT device table
        misc: fastrpc: restrict user apps from sending kernel RPC messages
        virt: acrn: Correct type casting of argument of copy_from_user()
        virt: acrn: Use EPOLLIN instead of POLLIN
        virt: acrn: Use vfs_poll() instead of f_op->poll()
        virt: acrn: Make remove_cpu sysfs invisible with !CONFIG_HOTPLUG_CPU
        cpu/hotplug: Fix build error of using {add,remove}_cpu() with !CONFIG_SMP
        habanalabs: fix debugfs address translation
        habanalabs: Disable file operations after device is removed
        habanalabs: Call put_pid() when releasing control device
        drivers: habanalabs: remove unused dentry pointer for debugfs files
        habanalabs: mark hl_eq_inc_ptr() as static
      88fe4924
    • Linus Torvalds's avatar
      Merge tag 'staging-5.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging · be61af33
      Linus Torvalds authored
      Pull staging driver fixes from Greg KH:
       "Here are some small staging driver fixes for reported problems. They
        include:
      
         - wfx header file cleanup patch reverted as it could cause problems
      
         - comedi driver endian fixes
      
         - buffer overflow problems for staging wifi drivers
      
         - build dependency issue for rtl8192e driver
      
        All have been in linux-next for a while with no reported problems"
      
      * tag 'staging-5.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging: (23 commits)
        Revert "staging: wfx: remove unused included header files"
        staging: rtl8188eu: prevent ->ssid overflow in rtw_wx_set_scan()
        staging: rtl8188eu: fix potential memory corruption in rtw_check_beacon_data()
        staging: rtl8192u: fix ->ssid overflow in r8192_wx_set_scan()
        staging: comedi: pcl726: Use 16-bit 0 for interrupt data
        staging: comedi: ni_65xx: Use 16-bit 0 for interrupt data
        staging: comedi: ni_6527: Use 16-bit 0 for interrupt data
        staging: comedi: comedi_parport: Use 16-bit 0 for interrupt data
        staging: comedi: amplc_pc236_common: Use 16-bit 0 for interrupt data
        staging: comedi: pcl818: Fix endian problem for AI command data
        staging: comedi: pcl711: Fix endian problem for AI command data
        staging: comedi: me4000: Fix endian problem for AI command data
        staging: comedi: dmm32at: Fix endian problem for AI command data
        staging: comedi: das800: Fix endian problem for AI command data
        staging: comedi: das6402: Fix endian problem for AI command data
        staging: comedi: adv_pci1710: Fix endian problem for AI command data
        staging: comedi: addi_apci_1500: Fix endian problem for command sample
        staging: comedi: addi_apci_1032: Fix endian problem for COS sample
        staging: ks7010: prevent buffer overflow in ks_wlan_set_scan()
        staging: rtl8712: Fix possible buffer overflow in r8712_sitesurvey_cmd
        ...
      be61af33
    • Linus Torvalds's avatar
      Merge tag 'tty-5.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty · cc14086f
      Linus Torvalds authored
      Pull tty/serial fixes from Greg KH:
       "Here are some small tty and serial driver fixes to resolve some
        reported problems:
      
         - led tty trigger fixes based on review and were acked by the led
           maintainer
      
         - revert a max310x serial driver patch as it was causing problems
      
         - revert a pty change as it was also causing problems
      
        All of these have been in linux-next for a while with no reported
        problems"
      
      * tag 'tty-5.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty:
        Revert "drivers:tty:pty: Fix a race causing data loss on close"
        Revert "serial: max310x: rework RX interrupt handling"
        leds: trigger/tty: Use led_set_brightness_sync() from workqueue
        leds: trigger: Fix error path to not unlock the unlocked mutex
      cc14086f
    • Linus Torvalds's avatar
      Merge tag 'usb-5.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb · 5c7bdbf8
      Linus Torvalds authored
      Pull USB fixes from Greg KH:
       "Here are a small number of USB fixes for 5.12-rc3 to resolve a bunch
        of reported issues:
      
         - usbip fixups for issues found by syzbot
      
         - xhci driver fixes and quirk additions
      
         - gadget driver fixes
      
         - dwc3 QCOM driver fix
      
         - usb-serial new ids and fixes
      
         - usblp fix for a long-time issue
      
         - cdc-acm quirk addition
      
         - other tiny fixes for reported problems
      
        All of these have been in linux-next for a while with no reported
        issues"
      
      * tag 'usb-5.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (25 commits)
        xhci: Fix repeated xhci wake after suspend due to uncleared internal wake state
        usb: xhci: Fix ASMedia ASM1042A and ASM3242 DMA addressing
        xhci: Improve detection of device initiated wake signal.
        usb: xhci: do not perform Soft Retry for some xHCI hosts
        usbip: fix vudc usbip_sockfd_store races leading to gpf
        usbip: fix vhci_hcd attach_store() races leading to gpf
        usbip: fix stub_dev usbip_sockfd_store() races leading to gpf
        usbip: fix vudc to check for stream socket
        usbip: fix vhci_hcd to check for stream socket
        usbip: fix stub_dev to check for stream socket
        usb: dwc3: qcom: Add missing DWC3 OF node refcount decrement
        USB: usblp: fix a hang in poll() if disconnected
        USB: gadget: udc: s3c2410_udc: fix return value check in s3c2410_udc_probe()
        usb: renesas_usbhs: Clear PIPECFG for re-enabling pipe with other EPNUM
        usb: dwc3: qcom: Honor wakeup enabled/disabled state
        usb: gadget: f_uac1: stop playback on function disable
        usb: gadget: f_uac2: always increase endpoint max_packet_size by one audio slot
        USB: gadget: u_ether: Fix a configfs return code
        usb: dwc3: qcom: add ACPI device id for sc8180x
        Goodix Fingerprint device is not a modem
        ...
      5c7bdbf8
    • Linus Torvalds's avatar
      Merge tag 'erofs-for-5.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs · 42062343
      Linus Torvalds authored
      Pull erofs fix from Gao Xiang:
       "Fix an urgent regression introduced by commit baa2c7c9 ("block:
        set .bi_max_vecs as actual allocated vector number"), which could
        cause unexpected hung since linux 5.12-rc1.
      
        Resolve it by avoiding using bio->bi_max_vecs completely"
      
      * tag 'erofs-for-5.12-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs:
        erofs: fix bio->bi_max_vecs behavior change
      42062343
    • Linus Torvalds's avatar
      Merge tag 'kbuild-fixes-v5.12-2' of... · e83bad7f
      Linus Torvalds authored
      Merge tag 'kbuild-fixes-v5.12-2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild
      
      Pull Kbuild fixes from Masahiro Yamada:
      
       - avoid 'make image_name' invoking syncconfig
      
       - fix a couple of bugs in scripts/dummy-tools
      
       - fix LLD_VENDOR and locale issues in scripts/ld-version.sh
      
       - rebuild GCC plugins when the compiler is upgraded
      
       - allow LTO to be enabled with KASAN_HW_TAGS
      
       - allow LTO to be enabled without LLVM=1
      
      * tag 'kbuild-fixes-v5.12-2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild:
        kbuild: fix ld-version.sh to not be affected by locale
        kbuild: remove meaningless parameter to $(call if_changed_rule,dtc)
        kbuild: remove LLVM=1 test from HAS_LTO_CLANG
        kbuild: remove unneeded -O option to dtc
        kbuild: dummy-tools: adjust to scripts/cc-version.sh
        kbuild: Allow LTO to be selected with KASAN_HW_TAGS
        kbuild: dummy-tools: support MPROFILE_KERNEL checks for ppc
        kbuild: rebuild GCC plugins when the compiler is upgraded
        kbuild: Fix ld-version.sh script if LLD was built with LLD_VENDOR
        kbuild: dummy-tools: fix inverted tests for gcc
        kbuild: add image_name to no-sync-config-targets
      e83bad7f
    • Minchan Kim's avatar
      zram: fix broken page writeback · 2766f182
      Minchan Kim authored
      commit 0d835962 ("zram: support page writeback") introduced two
      problems.  It overwrites writeback_store's return value as kstrtol's
      return value, which makes return value zero so user could see zero as
      return value of write syscall even though it wrote data successfully.
      
      It also breaks index value in the loop in that it doesn't increase the
      index any longer.  It means it can write only first starting block index
      so user couldn't write all idle pages in the zram so lose memory saving
      chance.
      
      This patch fixes those issues.
      
      Link: https://lkml.kernel.org/r/20210312173949.2197662-2-minchan@kernel.org
      Fixes: 0d835962("zram: support page writeback")
      Signed-off-by: default avatarMinchan Kim <minchan@kernel.org>
      Reported-by: default avatarAmos Bianchi <amosbianchi@google.com>
      Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
      Cc: John Dias <joaodias@google.com>
      Cc: <stable@vger.kernel.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      2766f182
    • Minchan Kim's avatar
      zram: fix return value on writeback_store · 57e0076e
      Minchan Kim authored
      writeback_store's return value is overwritten by submit_bio_wait's return
      value.  Thus, writeback_store will return zero since there was no IO
      error.  In the end, write syscall from userspace will see the zero as
      return value, which could make the process stall to keep trying the write
      until it will succeed.
      
      Link: https://lkml.kernel.org/r/20210312173949.2197662-1-minchan@kernel.org
      Fixes: 3b82a051("drivers/block/zram/zram_drv.c: fix error return codes not being returned in writeback_store")
      Signed-off-by: default avatarMinchan Kim <minchan@kernel.org>
      Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
      Cc: Colin Ian King <colin.king@canonical.com>
      Cc: John Dias <joaodias@google.com>
      Cc: <stable@vger.kernel.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      57e0076e
    • Zhou Guanghui's avatar
      mm/memcg: set memcg when splitting page · e1baddf8
      Zhou Guanghui authored
      As described in the split_page() comment, for the non-compound high order
      page, the sub-pages must be freed individually.  If the memcg of the first
      page is valid, the tail pages cannot be uncharged when be freed.
      
      For example, when alloc_pages_exact is used to allocate 1MB continuous
      physical memory, 2MB is charged(kmemcg is enabled and __GFP_ACCOUNT is
      set).  When make_alloc_exact free the unused 1MB and free_pages_exact free
      the applied 1MB, actually, only 4KB(one page) is uncharged.
      
      Therefore, the memcg of the tail page needs to be set when splitting a
      page.
      
      Michel:
      
      There are at least two explicit users of __GFP_ACCOUNT with
      alloc_exact_pages added recently.  See 7efe8ef2 ("KVM: arm64:
      Allocate stage-2 pgd pages with GFP_KERNEL_ACCOUNT") and c4196218
      ("KVM: s390: Add memcg accounting to KVM allocations"), so this is not
      just a theoretical issue.
      
      Link: https://lkml.kernel.org/r/20210304074053.65527-3-zhouguanghui1@huawei.comSigned-off-by: default avatarZhou Guanghui <zhouguanghui1@huawei.com>
      Acked-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
      Reviewed-by: default avatarZi Yan <ziy@nvidia.com>
      Reviewed-by: default avatarShakeel Butt <shakeelb@google.com>
      Acked-by: default avatarMichal Hocko <mhocko@suse.com>
      Cc: Hanjun Guo <guohanjun@huawei.com>
      Cc: Hugh Dickins <hughd@google.com>
      Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
      Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
      Cc: Nicholas Piggin <npiggin@gmail.com>
      Cc: Rui Xiang <rui.xiang@huawei.com>
      Cc: Tianhong Ding <dingtianhong@huawei.com>
      Cc: Weilong Chen <chenweilong@huawei.com>
      Cc: <stable@vger.kernel.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      e1baddf8