mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
synced 2026-11-03 16:13:17 +01:00
Peter Zijlstra
9ae1e990f1
The GCC specific __attribute__((optimize)) attribute does not what is commonly expected and is explicitly recommended against using in production code by the GCC people. Unlike what is often expected, it doesn't add to the optimization flags, but it fully replaces them, loosing any and all optimization flags provided by the compiler commandline. The only guaranteed upon means of inhibiting tail-calls is by placing a volatile asm with side-effects after the call such that the tail-call simply cannot be done. Given the original commit wasn't specific on which calls were the problem, this removal might re-introduce the problem, which can then be re-analyzed and cured properly. Signed-off-by: Peter Zijlstra <[email protected]> Acked-by: Ard Biesheuvel <[email protected]> Acked-by: Miguel Ojeda <[email protected]> Cc: Alexei Starovoitov <[email protected]> Cc: Arnd Bergmann <[email protected]> Cc: Arvind Sankar <[email protected]> Cc: Daniel Borkmann <[email protected]> Cc: Geert Uytterhoeven <[email protected]> Cc: Ian Rogers <[email protected]> Cc: Josh Poimboeuf <[email protected]> Cc: Kees Kook <[email protected]> Cc: Martin Liška <[email protected]> Cc: Nick Desaulniers <[email protected]> Cc: Randy Dunlap <[email protected]> Cc: Thomas Gleixner <[email protected]> Link: http://lore.kernel.org/lkml/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
45 lines
1.2 KiB
C
45 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _TOOLS_LINUX_COMPILER_H_
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#error "Please don't include <linux/compiler-gcc.h> directly, include <linux/compiler.h> instead."
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#endif
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/*
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* Common definitions for all gcc versions go here.
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*/
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#ifndef GCC_VERSION
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#define GCC_VERSION (__GNUC__ * 10000 \
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+ __GNUC_MINOR__ * 100 \
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+ __GNUC_PATCHLEVEL__)
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#endif
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#if GCC_VERSION >= 70000 && !defined(__CHECKER__)
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# define __fallthrough __attribute__ ((fallthrough))
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#endif
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#if GCC_VERSION >= 40300
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# define __compiletime_error(message) __attribute__((error(message)))
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#endif /* GCC_VERSION >= 40300 */
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/* &a[0] degrades to a pointer: a different type from an array */
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#define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
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#ifndef __pure
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#define __pure __attribute__((pure))
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#endif
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#define noinline __attribute__((noinline))
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#ifndef __packed
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#define __packed __attribute__((packed))
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#endif
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#ifndef __noreturn
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#define __noreturn __attribute__((noreturn))
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#endif
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#ifndef __aligned
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#define __aligned(x) __attribute__((aligned(x)))
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#endif
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#define __printf(a, b) __attribute__((format(printf, a, b)))
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#define __scanf(a, b) __attribute__((format(scanf, a, b)))
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#if GCC_VERSION >= 50100
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#define COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 1
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#endif
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