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powerpc/40x: Clear MSR_DR in one insn instead of two

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Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christophe Leroy
2016-08-05 13:28:05 +02:00
committed by Michael Ellerman
parent 92aa2fe039
commit 362957c27e
1 changed files with 2 additions and 4 deletions
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6
arch/powerpc/kernel/misc_32.S
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@@ -244,8 +244,7 @@ _GLOBAL(_nmask_and_or_msr)
*/ */
_GLOBAL(real_readb) _GLOBAL(real_readb)
mfmsr r7 mfmsr r7
ori r0,r7,MSR_DR rlwinm r0,r7,0,~MSR_DR
xori r0,r0,MSR_DR
sync sync
mtmsr r0 mtmsr r0
sync sync
@@ -262,8 +261,7 @@ _GLOBAL(real_readb)
*/ */
_GLOBAL(real_writeb) _GLOBAL(real_writeb)
mfmsr r7 mfmsr r7
ori r0,r7,MSR_DR rlwinm r0,r7,0,~MSR_DR
xori r0,r0,MSR_DR
sync sync
mtmsr r0 mtmsr r0
sync sync