Add additional instructions to our assembly bitops functions to ensure that they only operate on word-aligned pointers. This will be necessary when we switch these operations to use the word-based exclusive operations.
Signed-off-by: Russell King <[email protected]> --- arch/arm/lib/bitops.h | 8 ++++++++ 1 files changed, 8 insertions(+), 0 deletions(-) diff --git a/arch/arm/lib/bitops.h b/arch/arm/lib/bitops.h index d422529..910d599 100644 --- a/arch/arm/lib/bitops.h +++ b/arch/arm/lib/bitops.h @@ -1,6 +1,8 @@ #if __LINUX_ARM_ARCH__ >= 6 && defined(CONFIG_CPU_32v6K) .macro bitop, instr + tst r1, #3 + strne r1, [r1, -r1] @ assert word-aligned mov r2, #1 and r3, r0, #7 @ Get bit offset add r1, r1, r0, lsr #3 @ Get byte offset @@ -14,6 +16,8 @@ .endm .macro testop, instr, store + tst r1, #3 + strne r1, [r1, -r1] @ assert word-aligned and r3, r0, #7 @ Get bit offset mov r2, #1 add r1, r1, r0, lsr #3 @ Get byte offset @@ -32,6 +36,8 @@ .endm #else .macro bitop, instr + tst r1, #3 + strne r1, [r1, -r1] @ assert word-aligned and r2, r0, #7 mov r3, #1 mov r3, r3, lsl r2 @@ -52,6 +58,8 @@ * to avoid dirtying the data cache. */ .macro testop, instr, store + tst r1, #3 + strne r1, [r1, -r1] @ assert word-aligned add r1, r1, r0, lsr #3 and r3, r0, #7 mov r0, #1 -- 1.6.2.5 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
