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authorTony Breeds <tony@bakeyournoodle.com>2007-10-18 14:04:57 +0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-19 01:37:20 +0400
commit2c6221483169ddd4c04797cd7296ed4fe52fcdd7 (patch)
tree1db73f0bf60b036abe995350637a9a3e916c0ec2 /kernel/time.c
parent6212e3a388fdda3f19fa660ef5a30edf54d1dcfd (diff)
downloadlinux-2c6221483169ddd4c04797cd7296ed4fe52fcdd7.tar.xz
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.c2
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)