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sparc,x86: vdso: remove meaningless undefining CONFIG_OPTIMIZE_INLINING

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The code, #undef CONFIG_OPTIMIZE_INLINING, is not working as expected
because <linux/compiler_types.h> is parsed before vclock_gettime.c since
28128c61e0 ("kconfig.h: Include compiler types to avoid missed struct
attributes").

Since then, <linux/compiler_types.h> is included really early by using the
'-include' option.  So, you cannot negate the decision of
<linux/compiler_types.h> in this way.

You can confirm it by checking the pre-processed code, like this:

  $ make arch/x86/entry/vdso/vdso32/vclock_gettime.i

There is no difference with/without CONFIG_CC_OPTIMIZE_FOR_SIZE.

It is about two years since 28128c61e0.  Nobody has reported a problem
(or, nobody has even noticed the fact that this code is not working).

It is ugly and unreliable to attempt to undefine a CONFIG option from C
files, and anyway the inlining heuristic is up to the compiler.

Just remove the broken code.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Acked-by: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: David Miller <davem@davemloft.net>
Link: http://lkml.kernel.org/r/20200220110807.32534-1-masahiroy@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Masahiro Yamada 2020-04-06 20:09:30 -07:00 committed by Linus Torvalds
parent 63174f61df
commit 12a5b00a53
2 changed files with 0 additions and 8 deletions
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4
arch/sparc/vdso/vdso32/vclock_gettime.c
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@ -4,10 +4,6 @@
#define BUILD_VDSO32
#ifndef CONFIG_CC_OPTIMIZE_FOR_SIZE
#undef CONFIG_OPTIMIZE_INLINING
#endif
#ifdef CONFIG_SPARC64
/*

4
arch/x86/entry/vdso/vdso32/vclock_gettime.c
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@ -1,10 +1,6 @@
// SPDX-License-Identifier: GPL-2.0
#define BUILD_VDSO32
#ifndef CONFIG_CC_OPTIMIZE_FOR_SIZE
#undef CONFIG_OPTIMIZE_INLINING
#endif
#ifdef CONFIG_X86_64
/*