From: Christophe Leroy <christophe.leroy@c-s.fr>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Michael Ellerman <mpe@ellerman.id.au>,
Nicholas Piggin <npiggin@gmail.com>
Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org
Subject: [RFC PATCH v1 16/16] powerpc/32: don't do syscall stuff in transfer_to_handler on non BOOKE
Date: Fri, 8 Feb 2019 12:52:49 +0000 (UTC) [thread overview]
Message-ID: <e7ba540e3ca711be32ca84870fb2314c2f0b025d.1549630193.git.christophe.leroy@c-s.fr> (raw)
In-Reply-To: <cover.1549630193.git.christophe.leroy@c-s.fr>
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@c-s.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
prev parent reply other threads:[~2019-02-08 12:53 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-08 12:52 [RFC PATCH v1 00/16] powerpc/32: Implement fast syscall entry Christophe Leroy
2019-02-08 12:52 ` [PATCH v1 01/16] powerpc: CONFIG_THREAD_INFO_IN_TASK series Christophe Leroy
2019-02-08 12:52 ` [PATCH v1 02/16] powerpc/32: Refactor EXCEPTION entry macros for head_8xx.S and head_32.S Christophe Leroy
2019-02-08 12:52 ` [PATCH v1 03/16] powerpc/32: move LOAD_MSR_KERNEL() into head_32.h and use it Christophe Leroy
2019-02-11 0:21 ` Benjamin Herrenschmidt
2019-02-11 6:26 ` Christophe Leroy
2019-02-11 8:06 ` Benjamin Herrenschmidt
2019-02-08 12:52 ` [PATCH v1 04/16] powerpc/32: make the 6xx/8xx EXC_XFER_TEMPLATE() similar to the 40x/booke one Christophe Leroy
2019-02-08 12:52 ` [PATCH v1 05/16] powerpc/40x: Don't use SPRN_SPRG_SCRATCH2 in EXCEPTION_PROLOG Christophe Leroy
2019-02-08 12:52 ` [PATCH v1 06/16] powerpc/40x: add exception frame marker Christophe Leroy
2019-02-08 12:52 ` [PATCH v1 07/16] powerpc/40x: Split and rename NORMAL_EXCEPTION_PROLOG Christophe Leroy
2019-02-08 12:52 ` [PATCH v1 08/16] powerpc/40x: Refactor exception entry macros by using head_32.h Christophe Leroy
2019-02-08 12:52 ` [RFC PATCH v1 09/16] powerpc/fsl_booke: ensure SPEFloatingPointException() reenables interrupts Christophe Leroy
2019-02-08 12:52 ` [RFC PATCH v1 10/16] powerpc/32: enter syscall with MSR_EE inconditionaly set Christophe Leroy
2019-02-08 12:52 ` [RFC PATCH v1 11/16] powerpc/32: Enter exceptions with MSR_EE unset Christophe Leroy
2019-02-08 12:52 ` [RFC PATCH v1 12/16] powerpc/32: get rid of COPY_EE in exception entry Christophe Leroy
2019-02-08 12:52 ` [RFC PATCH v1 13/16] powerpc: Fix 32-bit handling of MSR_EE on exceptions Christophe Leroy
2019-02-08 12:52 ` [RFC PATCH v1 14/16] powerpc/32: implement fast entry for syscalls on non BOOKE Christophe Leroy
2019-02-10 18:05 ` christophe leroy
2019-02-08 12:52 ` [RFC PATCH v1 15/16] powerpc/32: Remove MSR_PR test when returning from syscall Christophe Leroy
2019-02-08 12:52 ` Christophe Leroy [this message]
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