diff options
| author | James Jones <jajones@nvidia.com> | 2010-11-24 00:21:37 +0100 |
|---|---|---|
| committer | Andi Kleen <ak@linux.intel.com> | 2010-12-14 23:40:15 +0100 |
| commit | a678efd76c8bb4041d95973c32f7def1fc7c43bf (patch) | |
| tree | 8f03c6b7377804bf1d800d4f395ab645b06f0530 | |
| parent | a683346b0f0625d3b29194fa86082235d1e858ce (diff) | |
ARM: 6482/2: Fix find_next_zero_bit and related assembly
commit 0e91ec0c06d2cd15071a6021c94840a50e6671aa upstream.
The find_next_bit, find_first_bit, find_next_zero_bit
and find_first_zero_bit functions were not properly
clamping to the maxbit argument at the bit level. They
were instead only checking maxbit at the byte level.
To fix this, add a compare and a conditional move
instruction to the end of the common bit-within-the-
byte code used by all the functions and be sure not to
clobber the maxbit argument before it is used.
Reviewed-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Tested-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: James Jones <jajones@nvidia.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
| -rw-r--r-- | arch/arm/lib/findbit.S | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/arm/lib/findbit.S b/arch/arm/lib/findbit.S index 1e4cbd4e7be..64f6bc1a913 100644 --- a/arch/arm/lib/findbit.S +++ b/arch/arm/lib/findbit.S @@ -174,8 +174,8 @@ ENDPROC(_find_next_bit_be) */ .L_found: #if __LINUX_ARM_ARCH__ >= 5 - rsb r1, r3, #0 - and r3, r3, r1 + rsb r0, r3, #0 + and r3, r3, r0 clz r3, r3 rsb r3, r3, #31 add r0, r2, r3 @@ -190,5 +190,7 @@ ENDPROC(_find_next_bit_be) addeq r2, r2, #1 mov r0, r2 #endif + cmp r1, r0 @ Clamp to maxbit + movlo r0, r1 mov pc, lr |