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Subject[PATCH 3.16 040/136] arm64: vdso: minor ABI fix for clock_getres
3.16.54-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Nathan Lynch <nathan_lynch@mentor.com>

commit e1b6b6ce55a0a25c8aa8af019095253b2133a41a upstream.

The vdso implementation of clock_getres currently returns 0 (success)
whenever a null timespec is provided by the caller, regardless of the
clock id supplied.

This behavior is incorrect. It should fall back to syscall when an
unrecognized clock id is passed, even when the timespec argument is
null. This ensures that clock_getres always returns an error for
invalid clock ids.

Signed-off-by: Nathan Lynch <nathan_lynch@mentor.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
arch/arm64/kernel/vdso/gettimeofday.S | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

--- a/arch/arm64/kernel/vdso/gettimeofday.S
+++ b/arch/arm64/kernel/vdso/gettimeofday.S
@@ -174,8 +174,6 @@ ENDPROC(__kernel_clock_gettime)
/* int __kernel_clock_getres(clockid_t clock_id, struct timespec *res); */
ENTRY(__kernel_clock_getres)
.cfi_startproc
- cbz w1, 3f
-
cmp w0, #CLOCK_REALTIME
ccmp w0, #CLOCK_MONOTONIC, #0x4, ne
b.ne 1f
@@ -188,6 +186,7 @@ ENTRY(__kernel_clock_getres)
b.ne 4f
ldr x2, 6f
2:
+ cbz w1, 3f
stp xzr, x2, [x1]

3: /* res == NULL. */
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