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selftests/rseq: Replace glibc-specific __GNUC_PREREQ with portable check

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Building the rseq selftests against musl libc fails because musl's
<features.h> does not provide the glibc-specific __GNUC_PREREQ macro:

  error: missing binary operator before token '('

Replace __GNUC_PREREQ(11, 1) with an equivalent check using __GNUC__
and __GNUC_MINOR__ directly.  This pattern is portable across all C
library implementations and is already used elsewhere in the tools/
tree (e.g., tools/include/linux/string.h).

This also allows removing the #include <features.h>, which was only
needed for __GNUC_PREREQ.

Fixes: 886ddfba93 ("selftests/rseq: Introduce thread pointer getters")
Signed-off-by: Hisam Mehboob <hisamshar@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/20260618193724.589113-2-hisamshar@gmail.com
This commit is contained in:
Hisam Mehboob
2026-07-03 00:15:01 +02:00
committed by Thomas Gleixner
parent dc59e4fea9
commit d7b2769f8d
1 changed files with 1 additions and 3 deletions
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tools/testing/selftests/rseq/rseq-x86-thread-pointer.h
+1 -3
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@@ -8,13 +8,11 @@
#ifndef _RSEQ_X86_THREAD_POINTER
#define _RSEQ_X86_THREAD_POINTER
#include <features.h>
#ifdef __cplusplus
extern "C" {
#endif
#if __GNUC_PREREQ (11, 1)
#if __GNUC__ > 11 || (__GNUC__ == 11 && __GNUC_MINOR__ >= 1)
static inline void *rseq_thread_pointer(void)
{
return __builtin_thread_pointer();