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.

Signed-off-by: Masahiro Yamada <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Reviewed-by: Nathan Chancellor <[e-mail]>
Acked-by: Miguel Ojeda <[e-mail]>
Cc: Arnd Bergmann <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: Thomas Gleixner <[e-mail]>
Cc: Masahiro Yamada <[e-mail]>
Cc: Borislav Petkov <[e-mail]>
Cc: "H. Peter Anvin" <[e-mail]>
Cc: David Miller <[e-mail]>
Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Linus Torvalds <[e-mail]>

arch/sparc/vdso/vdso32/vclock_gettime.c

···
 
 #define	BUILD_VDSO32
 
-#ifndef	CONFIG_CC_OPTIMIZE_FOR_SIZE
-#undef	CONFIG_OPTIMIZE_INLINING
-#endif
-
 #ifdef	CONFIG_SPARC64
 
 /*

arch/x86/entry/vdso/vdso32/vclock_gettime.c

···
 // SPDX-License-Identifier: GPL-2.0
 #define BUILD_VDSO32
 
-#ifndef CONFIG_CC_OPTIMIZE_FOR_SIZE
-#undef CONFIG_OPTIMIZE_INLINING
-#endif
-
 #ifdef CONFIG_X86_64
 
 /*