From: Nicholas Piggin <npiggin@gmail.com>
To: linuxppc-dev@lists.ozlabs.org
Cc: Nicholas Piggin <npiggin@gmail.com>
Subject: [PATCH 03/13] powerpc/64s: masked interrupt returns to kernel so avoid r13 restore
Date: Sun, 6 Aug 2017 03:02:31 +1000 [thread overview]
Message-ID: <20170805170241.22966-4-npiggin@gmail.com> (raw)
In-Reply-To: <20170805170241.22966-1-npiggin@gmail.com>
Places in the kernel where r13 is not the PACA pointer must have
maskable interrupts disabled, so r13 does not have to be restored
when returning from a soft-masked interrupt.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
arch/powerpc/kernel/exceptions-64s.S | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index c4f50a9e2ab5..67321be3122c 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -1379,7 +1379,7 @@ masked_##_H##interrupt: \
ld r9,PACA_EXGEN+EX_R9(r13); \
ld r10,PACA_EXGEN+EX_R10(r13); \
ld r11,PACA_EXGEN+EX_R11(r13); \
- GET_SCRATCH0(r13); \
+ /* returns to kernel where r13 must be set up, so don't restore it */ \
##_H##rfid; \
b .; \
MASKED_DEC_HANDLER(_H)
--
2.11.0
next prev parent reply other threads:[~2017-08-05 17:03 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-05 17:02 [PATCH 00/13] idle and soft-irq improvements and POWER9 idle optimisation Nicholas Piggin
2017-08-05 17:02 ` [PATCH 01/13] powerpc/64s: masked interrupt avoid branch Nicholas Piggin
2017-08-05 17:02 ` [PATCH 02/13] powerpc/64s: masked interrupt avoid instruction Nicholas Piggin
2017-08-05 17:02 ` Nicholas Piggin [this message]
2017-08-05 17:02 ` [PATCH 04/13] powerpc/64: cleanup __check_irq_replay Nicholas Piggin
2017-08-05 17:02 ` [PATCH 05/13] powerpc/64s: irq replay merge HV and non-HV paths for doorbell replay Nicholas Piggin
2017-08-05 17:02 ` [PATCH 06/13] powerpc/64s: irq replay external use the HV handler in HV mode on POWER9 Nicholas Piggin
2017-08-05 17:02 ` [PATCH 07/13] powerpc/64: remove redundant instruction in interrupt replay Nicholas Piggin
2017-08-05 17:02 ` [PATCH 08/13] powerpc/64s: irq replay remove spurious irq reason Nicholas Piggin
2017-08-05 23:00 ` Benjamin Herrenschmidt
2017-08-06 0:51 ` Nicholas Piggin
2017-08-10 13:12 ` Michael Ellerman
2017-08-05 17:02 ` [PATCH 09/13] powerpc/64: runlatch CTRL[RUN] set optimisation Nicholas Piggin
2017-08-05 17:02 ` [PATCH 10/13] powerpc/64s: idle simplify KVM idle on POWER9 Nicholas Piggin
2017-08-05 17:02 ` Nicholas Piggin
2017-08-08 10:36 ` Gautham R Shenoy
2017-08-08 10:48 ` Gautham R Shenoy
2017-08-08 12:42 ` Nicholas Piggin
2017-08-08 12:42 ` Nicholas Piggin
2017-08-10 6:24 ` Gautham R Shenoy
2017-08-10 6:36 ` Gautham R Shenoy
2017-08-10 13:14 ` Michael Ellerman
2017-08-10 13:14 ` Michael Ellerman
2017-08-10 13:53 ` Nicholas Piggin
2017-08-10 13:53 ` Nicholas Piggin
2017-08-05 17:02 ` [PATCH 11/13] powerpc/64s: idle POWER9 can execute stop without ptesync Nicholas Piggin
2017-08-08 10:37 ` Gautham R Shenoy
2017-08-10 13:15 ` Michael Ellerman
2017-08-10 14:03 ` Nicholas Piggin
2017-08-05 17:02 ` [PATCH 12/13] powerpc/64s: idle POWER9 can execute stop in virtual mode Nicholas Piggin
2017-08-05 22:57 ` Benjamin Herrenschmidt
2017-08-08 10:45 ` Gautham R Shenoy
2017-08-05 17:02 ` [PATCH 13/13] powerpc/64s: idle ESL=0 stop can avoid all save/restore overhead Nicholas Piggin
2017-08-05 17:11 ` Nicholas Piggin
2017-08-08 10:49 ` Gautham R Shenoy
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