From: Peter Collingbourne <pcc@google.com>
To: Andrey Konovalov <andreyknvl@google.com>,
Catalin Marinas <catalin.marinas@arm.com>
Cc: Peter Collingbourne <pcc@google.com>,
Linux ARM <linux-arm-kernel@lists.infradead.org>
Subject: [PATCH] arm64: mte: remove an ISB on kernel exit
Date: Wed, 2 Dec 2020 23:34:58 -0800 [thread overview]
Message-ID: <20201203073458.2675400-1-pcc@google.com> (raw)
This ISB is unnecessary because we will soon do an ERET.
Signed-off-by: Peter Collingbourne <pcc@google.com>
Link: https://linux-review.googlesource.com/id/I69f1ee6bb09b1372dd744a0e01cedaf090c8d448
---
arch/arm64/kernel/entry.S | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S
index 07646ef4f184..f8ad8d7fb1a2 100644
--- a/arch/arm64/kernel/entry.S
+++ b/arch/arm64/kernel/entry.S
@@ -182,7 +182,6 @@ alternative_else_nop_endif
mrs_s \tmp2, SYS_GCR_EL1
bfi \tmp2, \tmp, #0, #16
msr_s SYS_GCR_EL1, \tmp2
- isb
#endif
.endm
@@ -194,6 +193,7 @@ alternative_else_nop_endif
ldr_l \tmp, gcr_kernel_excl
mte_set_gcr \tmp, \tmp2
+ isb
1:
#endif
.endm
--
2.29.2.454.gaff20da3a2-goog
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next reply other threads:[~2020-12-03 7:36 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-03 7:34 Peter Collingbourne [this message]
2020-12-03 14:41 ` [PATCH] arm64: mte: remove an ISB on kernel exit Catalin Marinas
2021-01-04 11:49 ` Catalin Marinas
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