path: root/arch/powerpc
diff options
authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2013-10-01 16:54:05 +1000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-10-13 16:08:31 -0700
commit65ddee385ba4ba923eeb64182963815dc24f7bc1 (patch)
treec2c7d699ade3796a35b451ee91425a62593c68c8 /arch/powerpc
parent470d4d6fe7349299ed565948e539260c4d0d041c (diff)
powerpc: Fix parameter clobber in csum_partial_copy_generic()
commit d9813c3681a36774b254c0cdc9cce53c9e22c756 upstream. The csum_partial_copy_generic() uses register r7 to adjust the remaining bytes to process. Unfortunately, r7 also holds a parameter, namely the address of the flag to set in case of access exceptions while reading the source buffer. Lacking a quantum implementation of PowerPC, this commit instead uses register r9 to do the adjusting, leaving r7's pointer uncorrupted. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/powerpc')
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/lib/checksum_64.S b/arch/powerpc/lib/checksum_64.S
index 167f72555d6..609665aede7 100644
--- a/arch/powerpc/lib/checksum_64.S
+++ b/arch/powerpc/lib/checksum_64.S
@@ -269,8 +269,8 @@ _GLOBAL(csum_partial_copy_generic)
rldicl. r6,r3,64-1,64-2 /* r6 = (r3 & 0x3) >> 1 */
beq .Lcopy_aligned
- li r7,4
- sub r6,r7,r6
+ li r9,4
+ sub r6,r9,r6
mtctr r6