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| author | Andy Lutomirski <luto@MIT.EDU> | 2011-06-05 21:50:20 +0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2011-06-05 23:30:33 +0400 |
| commit | 0d7b8547fb67d5c2a7d954c56b3715b0e708be4a (patch) | |
| tree | f2d8b6c9c06b751f1b2c1b0665e761ce8e28a358 /arch/x86/include/asm/vgtod.h | |
| parent | 9fd67b4ed0714ab718f1f9bd14c344af336a6df7 (diff) | |
| download | linux-0d7b8547fb67d5c2a7d954c56b3715b0e708be4a.tar.xz | |
x86-64: Remove kernel.vsyscall64 sysctl
It's unnecessary overhead in code that's supposed to be highly
optimized. Removing it allows us to remove one of the two
syscall instructions in the vsyscall page.
The only sensible use for it is for UML users, and it doesn't
fully address inconsistent vsyscall results on UML. The real
fix for UML is to stop using vsyscalls entirely.
Signed-off-by: Andy Lutomirski <luto@mit.edu>
Cc: Jesper Juhl <jj@chaosbits.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Arjan van de Ven <arjan@infradead.org>
Cc: Jan Beulich <JBeulich@novell.com>
Cc: richard -rw- weinberger <richard.weinberger@gmail.com>
Cc: Mikael Pettersson <mikpe@it.uu.se>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Louis Rilling <Louis.Rilling@kerlabs.com>
Cc: Valdis.Kletnieks@vt.edu
Cc: pageexec@freemail.hu
Link: http://lkml.kernel.org/r/973ae803fe76f712da4b2740e66dccf452d3b1e4.1307292171.git.luto@mit.edu
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/include/asm/vgtod.h')
| -rw-r--r-- | arch/x86/include/asm/vgtod.h | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/x86/include/asm/vgtod.h b/arch/x86/include/asm/vgtod.h index 646b4c1ca695..aa5add855a91 100644 --- a/arch/x86/include/asm/vgtod.h +++ b/arch/x86/include/asm/vgtod.h @@ -11,7 +11,6 @@ struct vsyscall_gtod_data { time_t wall_time_sec; u32 wall_time_nsec; - int sysctl_enabled; struct timezone sys_tz; struct { /* extract of a clocksource struct */ cycle_t (*vread)(void); |