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Message-Id: <20180417155646.684452470@linuxfoundation.org>
Date: Tue, 17 Apr 2018 17:58:52 +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>,
Suzuki K Poulose <suzuki.poulose@....com>,
Marc Zyngier <marc.zyngier@....com>,
James Morse <james.morse@....com>,
Catalin Marinas <catalin.marinas@....com>,
Greg Hackmann <ghackmann@...gle.com>,
Mark Rutland <mark.rutland@....com>
Subject: [PATCH 4.9 19/66] arm64: cpufeature: __this_cpu_has_cap() shouldnt stop early
4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Mark Rutland <mark.rutland@....com>
From: James Morse <james.morse@....com>
commit edf298cfce47ab7279d03b5203ae2ef3a58e49db upstream.
this_cpu_has_cap() tests caps->desc not caps->matches, so it stops
walking the list when it finds a 'silent' feature, instead of
walking to the end of the list.
Prior to v4.6's 644c2ae198412 ("arm64: cpufeature: Test 'matches' pointer
to find the end of the list") we always tested desc to find the end of
a capability list. This was changed for dubious things like PAN_NOT_UAO.
v4.7's e3661b128e53e ("arm64: Allow a capability to be checked on
single CPU") added this_cpu_has_cap() using the old desc style test.
CC: Suzuki K Poulose <suzuki.poulose@....com>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@....com>
Acked-by: Marc Zyngier <marc.zyngier@....com>
Signed-off-by: James Morse <james.morse@....com>
Signed-off-by: Catalin Marinas <catalin.marinas@....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/cpufeature.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -1024,9 +1024,8 @@ static bool __this_cpu_has_cap(const str
if (WARN_ON(preemptible()))
return false;
- for (caps = cap_array; caps->desc; caps++)
+ for (caps = cap_array; caps->matches; caps++)
if (caps->capability == cap &&
- caps->matches &&
caps->matches(caps, SCOPE_LOCAL_CPU))
return true;
return false;
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