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Message-ID: <20230830121115.v12.5.Ifadbfd45b22c52edcb499034dd4783d096343260@changeid>
Date: Wed, 30 Aug 2023 12:11:26 -0700
From: Douglas Anderson <dianders@...omium.org>
To: Mark Rutland <mark.rutland@....com>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will@...nel.org>,
Sumit Garg <sumit.garg@...aro.org>,
Daniel Thompson <daniel.thompson@...aro.org>,
Marc Zyngier <maz@...nel.org>
Cc: linux-arm-kernel@...ts.infradead.org,
Masayoshi Mizuma <msys.mizuma@...il.com>,
"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
Chen-Yu Tsai <wens@...e.org>,
Lecopzer Chen <lecopzer.chen@...iatek.com>,
Tomohiro Misono <misono.tomohiro@...itsu.com>,
Stephane Eranian <eranian@...gle.com>,
kgdb-bugreport@...ts.sourceforge.net,
Peter Zijlstra <peterz@...radead.org>,
Thomas Gleixner <tglx@...utronix.de>,
Stephen Boyd <swboyd@...omium.org>, ito-yuichi@...itsu.com,
linux-perf-users@...r.kernel.org, Ard Biesheuvel <ardb@...nel.org>,
Douglas Anderson <dianders@...omium.org>,
D Scott Phillips <scott@...amperecomputing.com>,
Josh Poimboeuf <jpoimboe@...nel.org>,
Valentin Schneider <vschneid@...hat.com>,
linux-kernel@...r.kernel.org
Subject: [PATCH v12 5/7] arm64: smp: IPI_CPU_STOP and IPI_CPU_CRASH_STOP should try for NMI
There's no reason why IPI_CPU_STOP and IPI_CPU_CRASH_STOP can't be
handled as NMI. They are very simple and everything in them is
NMI-safe. Mark them as things to use NMI for if NMI is available.
Suggested-by: Mark Rutland <mark.rutland@....com>
Reviewed-by: Stephen Boyd <swboyd@...omium.org>
Reviewed-by: Misono Tomohiro <misono.tomohiro@...itsu.com>
Reviewed-by: Sumit Garg <sumit.garg@...aro.org>
Signed-off-by: Douglas Anderson <dianders@...omium.org>
---
I don't actually have any good way to test/validate this patch. It's
added to the series at Mark's request.
(no changes since v10)
Changes in v10:
- ("IPI_CPU_STOP and IPI_CPU_CRASH_STOP should try for NMI") new for v10.
arch/arm64/kernel/smp.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index 28c904ca499a..800c59cf9b64 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -946,6 +946,8 @@ static bool ipi_should_be_nmi(enum ipi_msg_type ipi)
return false;
switch (ipi) {
+ case IPI_CPU_STOP:
+ case IPI_CPU_CRASH_STOP:
case IPI_CPU_BACKTRACE:
return true;
default:
--
2.42.0.283.g2d96d420d3-goog
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