FAILED: Patch "tools: Fix bitfield dependency failure" failed to apply to 6.12-stable tree

[Sasha Levin <sashal@kernel.org>]

The patch below does not apply to the 6.12-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

Thanks,
Sasha

------------------ original commit in Linus's tree ------------------

From a537c0da168a08b0b6a7f7bd9e75f4cc8d45ff57 Mon Sep 17 00:00:00 2001
From: Leo Yan <leo.yan@arm.com>
Date: Fri, 23 Jan 2026 13:32:03 +0000
Subject: [PATCH] tools: Fix bitfield dependency failure
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

A perf build failure was reported by Thomas Voegtle on stable kernel
v6.6.120:

    CC      tests/sample-parsing.o
    CC      util/intel-pt-decoder/intel-pt-pkt-decoder.o
    CC      util/perf-regs-arch/perf_regs_csky.o
    CC      util/arm-spe-decoder/arm-spe-pkt-decoder.o
    CC      util/perf-regs-arch/perf_regs_loongarch.o
  In file included from util/arm-spe-decoder/arm-spe-pkt-decoder.h:10,
                   from util/arm-spe-decoder/arm-spe-pkt-decoder.c:14:
  /local/git/linux-stable-rc/tools/include/linux/bitfield.h: In function ‘le16_encode_bits’:
  /local/git/linux-stable-rc/tools/include/linux/bitfield.h:166:31: error: implicit declaration of
  function ‘cpu_to_le16’; did you mean ‘htole16’? [-Werror=implicit-function-declaration]
    ____MAKE_OP(le##size,u##size,cpu_to_le##size,le##size##_to_cpu) \
                                 ^~~~~~~~~
  /local/git/linux-stable-rc/tools/include/linux/bitfield.h:149:9: note: in definition of macro
  ‘____MAKE_OP’
    return to((v & field_mask(field)) * field_multiplier(field)); \
           ^~
  /local/git/linux-stable-rc/tools/include/linux/bitfield.h:170:1: note: in expansion of macro
  ‘__MAKE_OP’
   __MAKE_OP(16)

Fix this by including linux/kernel.h, which provides the required
definitions.

The issue was not found on the mainline due to the relevant C files have
included kernel.h.  It'd be good to merge this change on mainline
as well for robustness.

Closes: https://lore.kernel.org/stable/3a44500b-d7c8-179f-61f6-e51cb50d3512@lio96.de/
Fixes: 64d86c03e1441742 ("perf arm-spe: Extend branch operations")
Reported-by: Hamza Mahfooz <hamzamahfooz@linux.microsoft.com>
Reported-by: Thomas Voegtle <tv@lio96.de>
Signed-off-by: Leo Yan <leo.yan@arm.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Ian Rogers <irogers@google.com>
Cc: James Clark <james.clark@linaro.org>
Cc: Leo Yan <leo.yan@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
To: Sasha Levin <sashal@kernel.org>
Cc: stable@vger.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/include/linux/bitfield.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/include/linux/bitfield.h b/tools/include/linux/bitfield.h
index 6093fa6db2600..ddf81f24956ba 100644
--- a/tools/include/linux/bitfield.h
+++ b/tools/include/linux/bitfield.h
@@ -8,6 +8,7 @@
 #define _LINUX_BITFIELD_H
 
 #include <linux/build_bug.h>
+#include <linux/kernel.h>
 #include <asm/byteorder.h>
 
 /*
-- 
2.51.0