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authorAndy Lutomirski <luto@MIT.EDU>2011-06-05 21:50:20 +0400
committerIngo Molnar <mingo@elte.hu>2011-06-05 23:30:33 +0400
commit0d7b8547fb67d5c2a7d954c56b3715b0e708be4a (patch)
treef2d8b6c9c06b751f1b2c1b0665e761ce8e28a358 /arch/x86/include/asm
parent9fd67b4ed0714ab718f1f9bd14c344af336a6df7 (diff)
downloadlinux-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')
-rw-r--r--arch/x86/include/asm/vgtod.h1
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);