From: Nicholas Piggin <npiggin@gmail.com>
To: linuxppc-dev@lists.ozlabs.org
Cc: Nicholas Piggin <npiggin@gmail.com>
Subject: [PATCH v2 03/14] powerpc/64s: masked interrupt returns to kernel so avoid r13 restore
Date: Sat, 12 Aug 2017 02:39:01 +1000 [thread overview]
Message-ID: <20170811163912.28783-4-npiggin@gmail.com> (raw)
In-Reply-To: <20170811163912.28783-1-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)
--
2.13.3
next prev parent reply other threads:[~2017-08-11 16:39 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-11 16:38 [PATCH v2 00/14] idle and soft-irq improvements and POWER9 idle optimisation Nicholas Piggin
2017-08-11 16:38 ` [PATCH v2 01/14] powerpc/64s: masked interrupt avoid branch Nicholas Piggin
2017-08-24 12:37 ` [v2,01/14] " Michael Ellerman
2017-08-11 16:39 ` [PATCH v2 02/14] powerpc/64s: masked interrupt avoid instruction Nicholas Piggin
2017-08-11 16:39 ` Nicholas Piggin [this message]
2017-08-11 16:39 ` [PATCH v2 04/14] powerpc/64: cleanup __check_irq_replay Nicholas Piggin
2017-08-11 16:39 ` [PATCH v2 05/14] powerpc/64s: irq replay merge HV and non-HV paths for doorbell replay Nicholas Piggin
2017-08-11 16:39 ` [PATCH v2 06/14] powerpc/64s: irq replay external use the HV handler in HV mode on POWER9 Nicholas Piggin
2017-08-11 16:39 ` [PATCH v2 07/14] powerpc/64: remove redundant instruction in interrupt replay Nicholas Piggin
2017-08-11 16:39 ` [PATCH v2 08/14] powerpc/64s: irq replay remove spurious irq reason Nicholas Piggin
2017-08-11 16:39 ` [PATCH v2 09/14] powerpc/64: runlatch CTRL[RUN] set optimisation Nicholas Piggin
2017-08-11 16:39 ` [PATCH v2 10/14] KVM: PPC: Book3S HV: POWER9 does not require secondary thread management Nicholas Piggin
2017-08-24 9:34 ` Paul Mackerras
2017-08-24 12:45 ` Nicholas Piggin
2017-08-11 16:39 ` [PATCH v2 11/14] powerpc/64s: idle POWER9 can execute stop without a sync sequence Nicholas Piggin
2017-08-11 16:39 ` [PATCH v2 12/14] KVM: PPC: Book3S HV: " Nicholas Piggin
2017-08-24 10:27 ` Paul Mackerras
2017-08-24 12:53 ` Nicholas Piggin
2017-08-11 16:39 ` [PATCH v2 13/14] powerpc/64s: idle POWER9 can execute stop in virtual mode Nicholas Piggin
2017-08-11 16:39 ` [PATCH v2 14/14] powerpc/64s: idle ESL=0 stop can avoid MSR and save/restore overhead Nicholas Piggin
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