From: Anton Blanchard <anton@samba.org>
To: benh@kernel.crashing.org, paulus@samba.org, mpe@ellerman.id.au,
mikey@neuling.org, cyril.bur@au1.ibm.com
Cc: linuxppc-dev@lists.ozlabs.org
Subject: [PATCH 3/3] powerpc: Remove redundant mflr in _switch
Date: Sun, 26 Jul 2015 02:57:45 +1000 [thread overview]
Message-ID: <1437843465-1577-3-git-send-email-anton@samba.org> (raw)
In-Reply-To: <1437843465-1577-1-git-send-email-anton@samba.org>
No need to execute mflr twice.
Signed-off-by: Anton Blanchard <anton@samba.org>
---
arch/powerpc/kernel/entry_64.S | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index 8428280..f8779f2 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -440,9 +440,7 @@ _GLOBAL(_switch)
/* r3-r13 are caller saved -- Cort */
SAVE_8GPRS(14, r1)
SAVE_10GPRS(22, r1)
- mflr r20 /* Return to switch caller */
-
- std r20,_NIP(r1)
+ std r0,_NIP(r1) /* Return to switch caller */
mfcr r23
std r23,_CCR(r1)
std r1,KSP(r3) /* Set old stack pointer */
--
2.1.4
prev parent reply other threads:[~2015-07-25 16:57 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-25 16:57 [PATCH 1/3] powerpc: No need to disable kernel FP/VMX/VSX MSR bits on context switch Anton Blanchard
2015-07-25 16:57 ` [PATCH 2/3] powerpc: Create context switch helpers save_sprs() and restore_sprs() Anton Blanchard
2015-07-25 16:57 ` Anton Blanchard [this message]
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