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Message-Id: <1381488130-30235-87-git-send-email-luis.henriques@canonical.com> Date: Fri, 11 Oct 2013 11:41:56 +0100 From: Luis Henriques <luis.henriques@...onical.com> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org, kernel-team@...ts.ubuntu.com Cc: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, Anton Blanchard <anton@...ba.org>, Benjamin Herrenschmidt <benh@...nel.crashing.org>, Luis Henriques <luis.henriques@...onical.com> Subject: [PATCH 086/100] powerpc: Fix parameter clobber in csum_partial_copy_generic() 3.5.7.23 -stable review patch. If anyone has any objections, please let me know. ------------------ From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> 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@...ux.vnet.ibm.com> Signed-off-by: Anton Blanchard <anton@...ba.org> Signed-off-by: Benjamin Herrenschmidt <benh@...nel.crashing.org> Signed-off-by: Luis Henriques <luis.henriques@...onical.com> --- arch/powerpc/lib/checksum_64.S | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/lib/checksum_64.S b/arch/powerpc/lib/checksum_64.S index 18245af..afa2eba 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: -- 1.8.3.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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