linux-kernel - [PATCH 4.9 32/66] arm64: cpu_errata: Allow an erratum to be match for all revisions of a core

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Message-Id: <20180417155647.267387199@linuxfoundation.org>
Date:   Tue, 17 Apr 2018 17:59:05 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Mark Rutland <mark.rutland@....com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Marc Zyngier <marc.zyngier@....com>,
        Greg Hackmann <ghackmann@...gle.com>
Subject: [PATCH 4.9 32/66] arm64: cpu_errata: Allow an erratum to be match for all revisions of a core

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Mark Rutland <mark.rutland@....com>


From: Marc Zyngier <marc.zyngier@....com>

commit 06f1494f837da8997d670a1ba87add7963b08922 upstream.

Some minor erratum may not be fixed in further revisions of a core,
leading to a situation where the workaround needs to be updated each
time an updated core is released.

Introduce a MIDR_ALL_VERSIONS match helper that will work for all
versions of that MIDR, once and for all.

Acked-by: Thomas Gleixner <tglx@...utronix.de>
Acked-by: Mark Rutland <mark.rutland@....com>
Acked-by: Daniel Lezcano <daniel.lezcano@...aro.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@....com>
Signed-off-by: Marc Zyngier <marc.zyngier@....com>
Signed-off-by: Mark Rutland <mark.rutland@....com> [v4.9 backport]
Tested-by: Greg Hackmann <ghackmann@...gle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/arm64/kernel/cpu_errata.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/arch/arm64/kernel/cpu_errata.c
+++ b/arch/arm64/kernel/cpu_errata.c
@@ -127,6 +127,13 @@ static void  install_bp_hardening_cb(con
 	.midr_range_min = min, \
 	.midr_range_max = max
 
+#define MIDR_ALL_VERSIONS(model) \
+	.def_scope = SCOPE_LOCAL_CPU, \
+	.matches = is_affected_midr_range, \
+	.midr_model = model, \
+	.midr_range_min = 0, \
+	.midr_range_max = (MIDR_VARIANT_MASK | MIDR_REVISION_MASK)
+
 const struct arm64_cpu_capabilities arm64_errata[] = {
 #if	defined(CONFIG_ARM64_ERRATUM_826319) || \
 	defined(CONFIG_ARM64_ERRATUM_827319) || \