The patch titled
Subject: sparc,x86: vdso: remove meaningless undefining CONFIG_OPTIMIZE_INLINING
has been added to the -mm tree. Its filename is
sparcx86-vdso-remove-meaningless-undefining-config_optimize_inlining.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/sparcx86-vdso-remove-meaningless-undefining-config_optimize_inlining.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/sparcx86-vdso-remove-meaningless-undefining-config_optimize_inlining.patch
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------------------------------------------------------
From: Masahiro Yamada <masahiroy@xxxxxxxxxx>
Subject: sparc,x86: vdso: remove meaningless undefining CONFIG_OPTIMIZE_INLINING
The code, #undef CONFIG_OPTIMIZE_INLINING, is not working as expected
because <linux/compiler_types.h> is parsed before vclock_gettime.c since
28128c61e08e ("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 28128c61e08e. 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.
Link: http://lkml.kernel.org/r/20200220110807.32534-1-masahiroy@xxxxxxxxxx
Signed-off-by: Masahiro Yamada <masahiroy@xxxxxxxxxx>
Acked-by: Miguel Ojeda <miguel.ojeda.sandonis@xxxxxxxxx>
Reviewed-by: Nathan Chancellor <natechancellor@xxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Masahiro Yamada <masahiroy@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: David Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/sparc/vdso/vdso32/vclock_gettime.c | 4 ----
arch/x86/entry/vdso/vdso32/vclock_gettime.c | 4 ----
2 files changed, 8 deletions(-)
--- a/arch/sparc/vdso/vdso32/vclock_gettime.c~sparcx86-vdso-remove-meaningless-undefining-config_optimize_inlining
+++ a/arch/sparc/vdso/vdso32/vclock_gettime.c
@@ -4,10 +4,6 @@
#define BUILD_VDSO32
-#ifndef CONFIG_CC_OPTIMIZE_FOR_SIZE
-#undef CONFIG_OPTIMIZE_INLINING
-#endif
-
#ifdef CONFIG_SPARC64
/*
--- a/arch/x86/entry/vdso/vdso32/vclock_gettime.c~sparcx86-vdso-remove-meaningless-undefining-config_optimize_inlining
+++ a/arch/x86/entry/vdso/vdso32/vclock_gettime.c
@@ -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
/*
_
Patches currently in -mm which might be from masahiroy@xxxxxxxxxx are
asm-generic-make-more-kernel-space-headers-mandatory.patch
sparcx86-vdso-remove-meaningless-undefining-config_optimize_inlining.patch
compiler-remove-config_optimize_inlining-entirely.patch
