diff options
| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2013-10-01 16:54:05 +1000 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2013-10-26 21:06:07 +0100 |
| commit | 13ce0c4a399a654effc40a9a57e87ac23cf19267 (patch) | |
| tree | 7b5dd828aa41e5ca6b15d8a28448ad778923e919 /arch | |
| parent | 408318734877aca9f11a8d7d1835456305c61f4d (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: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/lib/checksum_64.S | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/lib/checksum_64.S b/arch/powerpc/lib/checksum_64.S index 18245af38aea..afa2ebaee174 100644 --- a/arch/powerpc/lib/checksum_64.S +++ b/arch/powerpc/lib/checksum_64.S @@ -272,8 +272,8 @@ _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: |