linux-kernel - [RFC PATCH v1 16/16] powerpc/32: don't do syscall stuff in transfer_to

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Date:   Fri,  8 Feb 2019 12:52:49 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [RFC PATCH v1 16/16] powerpc/32: don't do syscall stuff in
 transfer_to_handler on non BOOKE

As syscalls are now handled via a fast entry path, syscall related
actions can be removed from the generic transfer_to_handler path.

Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
---
 arch/powerpc/kernel/entry_32.S | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index 0927d5ff1e79..85f1fc88c237 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -211,7 +211,9 @@ transfer_to_handler_cont:
 	 */
 	tophys(r12, r1)
 	lwz	r12,_MSR(r12)
+#ifdef CONFIG_BOOKE	/* to be removed once BOOKE uses fast syscall entry */
 	xor	r12,r10,r12
+#endif
 	andi.	r12,r12,MSR_EE
 	bne	1f
 
@@ -252,8 +254,10 @@ reenable_mmu:
 	 * the rest is restored from the exception frame.
 	 */
 
+#ifdef CONFIG_BOOKE	/* to be removed once BOOKE uses fast syscall entry */
 	/* Are we enabling or disabling interrupts ? */
 	andi.	r0,r10,MSR_EE
+#endif
 
 	stwu	r1,-32(r1)
 	stw	r9,8(r1)
@@ -262,7 +266,9 @@ reenable_mmu:
 	stw	r4,20(r1)
 	stw	r5,24(r1)
 
+#ifdef CONFIG_BOOKE	/* to be removed once BOOKE uses fast syscall entry */
 	bne-	0f
+#endif
 
 	/* If we are disabling interrupts (normal case), simply log it with
 	 * lockdep
@@ -282,6 +288,7 @@ reenable_mmu:
 	mtlr	r9
 	bctr				/* jump to handler */
 
+#ifdef CONFIG_BOOKE	/* to be removed once BOOKE uses fast syscall entry */
 	/* If we are enabling interrupt, this is a syscall. They shouldn't
 	 * happen while interrupts are disabled, so let's do a warning here.
 	 */
@@ -294,6 +301,7 @@ reenable_mmu:
 	ori	r10,r10,MSR_EE
 	mtmsr	r10
 	b	2b
+#endif
 #endif /* CONFIG_TRACE_IRQFLAGS */
 
 #if defined (CONFIG_PPC_BOOK3S_32) || defined(CONFIG_E500)
-- 
2.13.3