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authorTony Breeds <tony@bakeyournoodle.com>2007-10-18 06:04:57 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-18 17:37:20 -0400
commit2c6221483169ddd4c04797cd7296ed4fe52fcdd7 (patch)
tree1db73f0bf60b036abe995350637a9a3e916c0ec2 /include/linux/clocksource.h
parent6212e3a388fdda3f19fa660ef5a30edf54d1dcfd (diff)
Fix discrepancy between VDSO based gettimeofday() and sys_gettimeofday().
On platforms that copy sys_tz into the vdso (currently only x86_64, soon to include powerpc), it is possible for the vdso to get out of sync if a user calls (admittedly unusual) settimeofday(NULL, ptr). This patch adds a hook for architectures that set CONFIG_GENERIC_TIME_VSYSCALL to ensure when sys_tz is updated they can also updatee their copy in the vdso. Signed-off-by: Tony Breeds <tony@bakeyournoodle.com> Cc: Andi Kleen <ak@suse.de> Cc: Tony Luck <tony.luck@intel.com> Acked-by: John Stultz <johnstul@us.ibm.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/clocksource.h')
-rw-r--r--include/linux/clocksource.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h
index 16ea3374dddf..107787aacb64 100644
--- a/include/linux/clocksource.h
+++ b/include/linux/clocksource.h
@@ -221,10 +221,15 @@ extern void clocksource_resume(void);
221 221
222#ifdef CONFIG_GENERIC_TIME_VSYSCALL 222#ifdef CONFIG_GENERIC_TIME_VSYSCALL
223extern void update_vsyscall(struct timespec *ts, struct clocksource *c); 223extern void update_vsyscall(struct timespec *ts, struct clocksource *c);
224extern void update_vsyscall_tz(void);
224#else 225#else
225static inline void update_vsyscall(struct timespec *ts, struct clocksource *c) 226static inline void update_vsyscall(struct timespec *ts, struct clocksource *c)
226{ 227{
227} 228}
229
230static inline void update_vsyscall_tz(void)
231{
232}
228#endif 233#endif
229 234
230#endif /* _LINUX_CLOCKSOURCE_H */ 235#endif /* _LINUX_CLOCKSOURCE_H */