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authorTony Breeds <tony@bakeyournoodle.com>2007-10-18 03:04:57 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-18 14:37:20 -0700
commit2c6221483169ddd4c04797cd7296ed4fe52fcdd7 (patch)
tree1db73f0bf60b036abe995350637a9a3e916c0ec2 /arch/ia64
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 'arch/ia64')
-rw-r--r--arch/ia64/kernel/time.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/ia64/kernel/time.c b/arch/ia64/kernel/time.c
index 98cfc90cab1..2bb84214e5f 100644
--- a/arch/ia64/kernel/time.c
+++ b/arch/ia64/kernel/time.c
@@ -371,6 +371,11 @@ ia64_setup_printk_clock(void)
ia64_printk_clock = ia64_itc_printk_clock;
}
+/* IA64 doesn't cache the timezone */
+void update_vsyscall_tz(void)
+{
+}
+
void update_vsyscall(struct timespec *wall, struct clocksource *c)
{
unsigned long flags;