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>
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@ -269,8 +269,8 @@ _GLOBAL(csum_partial_copy_generic)
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rldicl. r6,r3,64-1,64-2 /* r6 = (r3 & 0x3) >> 1 */
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rldicl. r6,r3,64-1,64-2 /* r6 = (r3 & 0x3) >> 1 */
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beq .Lcopy_aligned
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beq .Lcopy_aligned
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li r7,4
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li r9,4
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sub r6,r7,r6
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sub r6,r9,r6
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mtctr r6
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mtctr r6
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1:
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1:
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