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d7b2769f8d
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
39 lines
699 B
C
39 lines
699 B
C
/* SPDX-License-Identifier: LGPL-2.1-only OR MIT */
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/*
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* rseq-x86-thread-pointer.h
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*
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* (C) Copyright 2021 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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*/
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#ifndef _RSEQ_X86_THREAD_POINTER
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#define _RSEQ_X86_THREAD_POINTER
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if __GNUC__ > 11 || (__GNUC__ == 11 && __GNUC_MINOR__ >= 1)
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static inline void *rseq_thread_pointer(void)
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{
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return __builtin_thread_pointer();
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}
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#else
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static inline void *rseq_thread_pointer(void)
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{
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void *__result;
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# ifdef __x86_64__
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__asm__ ("mov %%fs:0, %0" : "=r" (__result));
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# else
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__asm__ ("mov %%gs:0, %0" : "=r" (__result));
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# endif
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return __result;
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}
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#endif /* !GCC 11 */
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#ifdef __cplusplus
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}
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#endif
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#endif
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