linux-kernel - [PATCH v12 7/7] arm64: smp: Mark IPI globals as __ro_after

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Message-ID: <20230830121115.v12.7.I625d393afd71e1766ef73d3bfaac0b347a4afd19@changeid>
Date:   Wed, 30 Aug 2023 12:11:28 -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 7/7] arm64: smp: Mark IPI globals as __ro_after_init

Mark the three IPI-related globals in smp.c as "__ro_after_init" since
they are only ever set in set_smp_ipi_range(), which is marked
"__init". This is a better and more secure marking than the old
"__read_mostly".

Suggested-by: Stephen Boyd <swboyd@...omium.org>
Signed-off-by: Douglas Anderson <dianders@...omium.org>
---
This patch is almost completely unrelated to the rest of the series
other than the fact that it would cause a merge conflict with the
series if sent separately. I tacked it on to this series in response
to Stephen's feedback on v11 of this series [1]. If someone hates it
(not sure why they would), it could be dropped. If someone loves it,
it could be promoted to the start of the series and/or land on its own
(resolving merge conflicts).

[1] https://lore.kernel.org/r/CAE-0n52iVDgZa8XT8KTMj12c_ESSJt7f7A0fuZ_oAMMqpGcSzA@mail.gmail.com

Changes in v12:
- ("arm64: smp: Mark IPI globals as __ro_after_init") new for v12.

 arch/arm64/kernel/smp.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index 1a53e57c81d0..814d9aa93b21 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -84,9 +84,9 @@ enum ipi_msg_type {
 	MAX_IPI
 };
 
-static int ipi_irq_base __read_mostly;
-static int nr_ipi __read_mostly = NR_IPI;
-static struct irq_desc *ipi_desc[MAX_IPI] __read_mostly;
+static int ipi_irq_base __ro_after_init;
+static int nr_ipi __ro_after_init = NR_IPI;
+static struct irq_desc *ipi_desc[MAX_IPI] __ro_after_init;
 
 static void ipi_setup(int cpu);
 
-- 
2.42.0.283.g2d96d420d3-goog