]> git.itanic.dy.fi Git - linux-stable/commit
tools headers UAPI: Update tools's copy of kvm.h header
authorNamhyung Kim <namhyung@kernel.org>
Tue, 21 Nov 2023 22:56:38 +0000 (14:56 -0800)
committerNamhyung Kim <namhyung@kernel.org>
Wed, 22 Nov 2023 18:57:46 +0000 (10:57 -0800)
commit5a9f95b67059dda160f65ab41c48587103b3b3a0
tree98bb860ae4bb2cc4772985e9cd2ba3a773e35847
parent111844666672347747585e24d6cebda640bd1284
tools headers UAPI: Update tools's copy of kvm.h header

tldr; Just FYI, I'm carrying this on the perf tools tree.

Full explanation:

There used to be no copies, with tools/ code using kernel headers
directly. From time to time tools/perf/ broke due to legitimate kernel
hacking. At some point Linus complained about such direct usage. Then we
adopted the current model.

The way these headers are used in perf are not restricted to just
including them to compile something.

There are sometimes used in scripts that convert defines into string
tables, etc, so some change may break one of these scripts, or new MSRs
may use some different #define pattern, etc.

E.g.:

  $ ls -1 tools/perf/trace/beauty/*.sh | head -5
  tools/perf/trace/beauty/arch_errno_names.sh
  tools/perf/trace/beauty/drm_ioctl.sh
  tools/perf/trace/beauty/fadvise.sh
  tools/perf/trace/beauty/fsconfig.sh
  tools/perf/trace/beauty/fsmount.sh
  $
  $ tools/perf/trace/beauty/fadvise.sh
  static const char *fadvise_advices[] = {
        [0] = "NORMAL",
        [1] = "RANDOM",
        [2] = "SEQUENTIAL",
        [3] = "WILLNEED",
        [4] = "DONTNEED",
        [5] = "NOREUSE",
  };
  $

The tools/perf/check-headers.sh script, part of the tools/ build
process, points out changes in the original files.

So its important not to touch the copies in tools/ when doing changes in
the original kernel headers, that will be done later, when
check-headers.sh inform about the change to the perf tools hackers.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: kvm@vger.kernel.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20231121225650.390246-3-namhyung@kernel.org
tools/include/uapi/linux/kvm.h