[PATCH 3.12 09/32] arm64: vdso: update wtm fields for CLOCK_MONOTONIC_COARSE

From: Greg Kroah-Hartman
Date: Tue Feb 18 2014 - 17:47:07 EST


3.12-stable review patch. If anyone has any objections, please let me know.

------------------

From: Nathan Lynch <nathan_lynch@xxxxxxxxxx>

commit d4022a335271a48cce49df35d825897914fbffe3 upstream.

Update wall-to-monotonic fields in the VDSO data page
unconditionally. These are used to service CLOCK_MONOTONIC_COARSE,
which is not guarded by use_syscall.

Signed-off-by: Nathan Lynch <nathan_lynch@xxxxxxxxxx>
Acked-by: Will Deacon <will.deacon@xxxxxxx>
Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
arch/arm64/kernel/vdso.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

--- a/arch/arm64/kernel/vdso.c
+++ b/arch/arm64/kernel/vdso.c
@@ -235,6 +235,8 @@ void update_vsyscall(struct timekeeper *
vdso_data->use_syscall = use_syscall;
vdso_data->xtime_coarse_sec = xtime_coarse.tv_sec;
vdso_data->xtime_coarse_nsec = xtime_coarse.tv_nsec;
+ vdso_data->wtm_clock_sec = tk->wall_to_monotonic.tv_sec;
+ vdso_data->wtm_clock_nsec = tk->wall_to_monotonic.tv_nsec;

if (!use_syscall) {
vdso_data->cs_cycle_last = tk->clock->cycle_last;
@@ -242,8 +244,6 @@ void update_vsyscall(struct timekeeper *
vdso_data->xtime_clock_nsec = tk->xtime_nsec;
vdso_data->cs_mult = tk->mult;
vdso_data->cs_shift = tk->shift;
- vdso_data->wtm_clock_sec = tk->wall_to_monotonic.tv_sec;
- vdso_data->wtm_clock_nsec = tk->wall_to_monotonic.tv_nsec;
}

smp_wmb();


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