linux.git/tools/include/linux/compiler.h, branch v6.18.21

tools headers: Add stub definition for __iomem

2025-08-27T18:14:06+00:00

Add an empty definition for __iomem so that kernel headers that use
__iomem can be imported into tools/include/ with less modifications.

Acked-by: Shuah Khan 
Signed-off-by: David Matlack 
Link: https://lore.kernel.org/r/20250822212518.4156428-15-dmatlack@google.com
Signed-off-by: Alex Williamson

tools headers: Syncronize linux/build_bug.h with the kernel sources

2025-06-16T17:05:11+00:00

To pick up the changes in:

  243c90e917f5cfc9 ("build_bug.h: more user friendly error messages in BUILD_BUG_ON_ZERO()")

This also needed to pick the __BUILD_BUG_ON_ZERO_MSG() in
linux/compiler.h, that needed to be polished to avoid hitting old clang
problems with _Static_assert on arrays of structs:

  Debian clang version 11.0.1-2~deb10u1

  Debian clang version 11.0.1-2~deb10u1
  $ make NO_LIBTRACEEVENT=1 ARCH= CROSS_COMPILE= EXTRA_CFLAGS= -C tools/perf O=/tmp/build/perf CC=clang
  
  btf_dump.c:895:18: error: type name does not allow storage class to be specified
          for (i = 0; i < ARRAY_SIZE(pads); i++) {
                          ^
  /git/perf-6.16.0-rc1/tools/include/linux/kernel.h:91:59: note: expanded from macro 'ARRAY_SIZE'
  #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
                                                            ^
  /git/perf-6.16.0-rc1/tools/include/linux/compiler-gcc.h:26:28: note: expanded from macro '__must_be_array'
  #define __must_be_array(a)      BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
                                  ^
  /git/perf-6.16.0-rc1/tools/include/linux/build_bug.h:17:2: note: expanded from macro 'BUILD_BUG_ON_ZERO'
          __BUILD_BUG_ON_ZERO_MSG(e, ##__VA_ARGS__, #e " is true")
          ^
  /git/perf-6.16.0-rc1/tools/include/linux/compiler.h:248:67: note: expanded from macro '__BUILD_BUG_ON_ZERO_MSG'
  #define __BUILD_BUG_ON_ZERO_MSG(e, msg, ...) ((int)sizeof(struct {_Static_assert(!(e), msg);}))
                                                                    ^
  /usr/include/x86_64-linux-gnu/sys/cdefs.h:438:5: note: expanded from macro '_Static_assert'
      extern int (*__Static_assert_function (void)) \
      ^

These also failed:

toolsbuilder@five:~$ grep FAIL dm.log/summary | grep clang
   1    72.87 almalinux:8    : FAIL clang version 19.1.7 ( 19.1.7-2.module_el8.10.0+3990+33d0d926)
  15    73.39 centos:stream  : FAIL clang version 17.0.6 (Red Hat 17.0.6-1.module_el8+767+9fa966b8)
  36    87.14 opensuse:15.4  : FAIL clang version 15.0.7
  37    80.08 opensuse:15.5  : FAIL clang version 15.0.7
  40    72.12 oraclelinux:8  : FAIL clang version 16.0.6 (Red Hat 16.0.6-2.0.1.module+el8.9.0+90129+d3ee8717)
  42    74.12 rockylinux:8   : FAIL clang version 16.0.6 (Red Hat 16.0.6-2.module+el8.9.0+1651+e10a8f6d)
toolsbuilder@five:~$

This addresses this perf build warning:

  Warning: Kernel ABI header differences:
    diff -u tools/include/linux/build_bug.h include/linux/build_bug.h

Cc: Adrian Hunter 
Cc: Ian Rogers 
Cc: James Clark 
Cc: Jiri Olsa 
Cc: Kan Liang 
Cc: Namhyung Kim 
Cc: Vincent Mailhol 
Cc: Yury Norov 
Link: https://lore.kernel.org/r/aEszb7SSIJB6Lp6f@x1
Signed-off-by: Arnaldo Carvalho de Melo

tools headers compiler: Pick the const_true() define from the kernel sources

2025-05-20T15:57:19+00:00

The sync of include/linux/bits.h with the kernel sources will make use
of this define, so add it to the tools/include/linux/compiler. variant
used to build tools/ living code.

Acked-by: Vincent Mailhol 
Acked-by: Yury Norov [NVIDIA] 
Cc: Adrian Hunter 
Cc: Ian Rogers 
Cc: James Clark 
Cc: Jiri Olsa 
Cc: Kan Liang 
Cc: Namhyung Kim 
Link: https://lore.kernel.org/r/20250519214126.1652491-7-acme@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo

Merge tag 'memblock-v6.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rppt/memblock

2024-09-25T18:35:19+00:00

Pull memblock updates from Mike Rapoport:

 - new memblock_estimated_nr_free_pages() helper to replace
   totalram_pages() which is less accurate when
   CONFIG_DEFERRED_STRUCT_PAGE_INIT is set

 - fixes for memblock tests

* tag 'memblock-v6.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rppt/memblock:
  s390/mm: get estimated free pages by memblock api
  kernel/fork.c: get estimated free pages by memblock api
  mm/memblock: introduce a new helper memblock_estimated_nr_free_pages()
  memblock test: fix implicit declaration of function 'strscpy'
  memblock test: fix implicit declaration of function 'isspace'
  memblock test: fix implicit declaration of function 'memparse'
  memblock test: add the definition of __setup()
  memblock test: fix implicit declaration of function 'virt_to_phys'
  tools/testing: abstract two init.h into common include directory
  memblock tests: include export.h in linkage.h as kernel dose
  memblock tests: include memory_hotplug.h in mmzone.h as kernel dose

arm64: vDSO: Wire up getrandom() vDSO implementation

2024-09-13T15:28:36+00:00

Hook up the generic vDSO implementation to the aarch64 vDSO data page.
The _vdso_rng_data required data is placed within the _vdso_data vvar
page, by using a offset larger than the vdso_data.

The vDSO function requires a ChaCha20 implementation that does not write
to the stack, and that can do an entire ChaCha20 permutation.  The one
provided uses NEON on the permute operation, with a fallback to the
syscall for chips that do not support AdvSIMD.

This also passes the vdso_test_chacha test along with
vdso_test_getrandom. The vdso_test_getrandom bench-single result on
Neoverse-N1 shows:

   vdso: 25000000 times in 0.783884250 seconds
   libc: 25000000 times in 8.780275399 seconds
syscall: 25000000 times in 8.786581518 seconds

A small fixup to arch/arm64/include/asm/mman.h was required to avoid
pulling kernel code into the vDSO, similar to what's already done in
arch/arm64/include/asm/rwonce.h.

Signed-off-by: Adhemerval Zanella 
Reviewed-by: Ard Biesheuvel 
Acked-by: Will Deacon 
Signed-off-by: Jason A. Donenfeld

tools/testing: abstract two init.h into common include directory

2024-08-06T05:17:50+00:00

Currently we have two test suits define its own init.h. This is a little
redundant.

Let's create a init.h in common include directory and merge these two
into it.

Signed-off-by: Wei Yang 
CC: Mike Rapoport 
CC: Liam R. Howlett 
Link: https://lore.kernel.org/r/20240712035138.24674-3-richard.weiyang@gmail.com
Signed-off-by: Mike Rapoport (Microsoft)

selftests/bpf: Add uretprobe syscall test for regs integrity

2024-06-11T23:44:28+00:00

Add uretprobe syscall test that compares register values before
and after the uretprobe is hit. It also compares the register
values seen from attached bpf program.

Link: https://lore.kernel.org/all/20240611112158.40795-6-jolsa@kernel.org/

Acked-by: Andrii Nakryiko 
Reviewed-by: Masami Hiramatsu (Google) 
Signed-off-by: Jiri Olsa 
Signed-off-by: Masami Hiramatsu (Google)

selftests/bpf: Mark uprobe trigger functions with nocf_check attribute

2024-03-22T17:01:17+00:00

Some distros seem to enable the -fcf-protection=branch by default,
which breaks our setup on first instruction of uprobe trigger
functions and place there endbr64 instruction.

Marking them with nocf_check attribute to skip that.

Ignoring unknown attribute warning in gcc for bench objects, because
nocf_check can be used only when -fcf-protection=branch is enabled,
otherwise we get a warning and break compilation.

Signed-off-by: Jiri Olsa 
Signed-off-by: Andrii Nakryiko 
Link: https://lore.kernel.org/bpf/20240322134936.1075395-1-jolsa@kernel.org

compiler.h: move __is_constexpr() to compiler.h

2023-10-18T21:43:22+00:00

Prior to f747e6667ebb2 __is_constexpr() was in its only user minmax.h. 
That commit moved it to const.h - but that file just defines ULL(x) and
UL(x) so that constants can be defined for .S and .c files.

So apart from the word 'const' it wasn't really a good location.  Instead
move the definition to compiler.h just before the similar

  is_signed_type() and is_unsigned_type().

This may not be a good long-term home, but the three definitions belong
together.

Link: https://lkml.kernel.org/r/2a6680bbe2e84459816a113730426782@AcuMS.aculab.com
Signed-off-by: David Laight 
Reviewed-by: Kees Cook 
Cc: Arnd Bergmann 
Cc: Bart Van Assche 
Cc: Nathan Chancellor 
Cc: Nick Desaulniers 
Cc: Rasmus Villemoes 
Cc: Steven Rostedt (Google) 
Signed-off-by: Andrew Morton

tools include: Add some common function attributes

2023-08-04T16:36:52+00:00

We don't have definitions of __always_unused or __noreturn in the tools
version of compiler.h, add them so we can use them in kselftests.

Signed-off-by: Mark Brown 
Link: https://lore.kernel.org/r/20230728-arm64-signal-memcpy-fix-v4-3-0c1290db5d46@kernel.org
Signed-off-by: Will Deacon