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| author | Tony Breeds <tony@bakeyournoodle.com> | 2007-10-18 12:04:57 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-18 23:37:20 +0200 |
| commit | 2c6221483169ddd4c04797cd7296ed4fe52fcdd7 (patch) | |
| tree | 1db73f0bf60b036abe995350637a9a3e916c0ec2 /kernel/time.c | |
| parent | Remove struct task_struct::io_wait (diff) | |
| download | linux-2c6221483169ddd4c04797cd7296ed4fe52fcdd7.tar.xz linux-2c6221483169ddd4c04797cd7296ed4fe52fcdd7.zip | |
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 'kernel/time.c')
| -rw-r--r-- | kernel/time.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/time.c b/kernel/time.c index 2d5b6a682138..d9725bdcd045 100644 --- a/kernel/time.c +++ b/kernel/time.c @@ -30,6 +30,7 @@ #include <linux/module.h> #include <linux/timex.h> #include <linux/capability.h> +#include <linux/clocksource.h> #include <linux/errno.h> #include <linux/syscalls.h> #include <linux/security.h> @@ -158,6 +159,7 @@ int do_sys_settimeofday(struct timespec *tv, struct timezone *tz) if (tz) { /* SMP safe, global irq locking makes it work. */ sys_tz = *tz; + update_vsyscall_tz(); if (firsttime) { firsttime = 0; if (!tv) |