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powerpc: Fix parameter clobber in csum_partial_copy_generic()

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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>
This commit is contained in:
Paul E. McKenney 2013-10-01 16:54:05 +10:00 committed by Benjamin Herrenschmidt
parent f7e3334a6b
commit d9813c3681
1 changed files with 2 additions and 2 deletions
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4
arch/powerpc/lib/checksum_64.S
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@ -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: