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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2013-10-01 10:54:05 +0400
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2013-10-03 11:22:36 +0400
commitd9813c3681a36774b254c0cdc9cce53c9e22c756 (patch)
tree8aaf4c7d3f7c9984084e00476bd7d61c6230405f /arch/powerpc/lib
parentf7e3334a6bcb42e7295a9bd9cb36ca4e6e4e66b4 (diff)
downloadlinux-d9813c3681a36774b254c0cdc9cce53c9e22c756.tar.xz
powerpc: Fix parameter clobber in csum_partial_copy_generic()
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> Cc: stable@vger.kernel.org Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/lib')
-rw-r--r--arch/powerpc/lib/checksum_64.S4
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/lib/checksum_64.S b/arch/powerpc/lib/checksum_64.S
index 167f72555d60..609665aede75 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
1: