linux-kernel - [PATCH 4.0 139/220] arm64: fix midr range for Cortex-A57 erratum 832075

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Message-Id: <20150502185900.334926411@linuxfoundation.org>
Date:	Sat,  2 May 2015 21:00:54 +0200
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Andre Przywara <andre.przywara@....com>,
	Paul Walmsley <paul@...an.com>, Bo Yan <byan@...dia.com>,
	Will Deacon <will.deacon@....com>
Subject: [PATCH 4.0 139/220] arm64: fix midr range for Cortex-A57 erratum 832075

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

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

From: Bo Yan <byan@...dia.com>

commit 6d1966dfd6e0ad2f8aa4b664ae1a62e33abe1998 upstream.

Register MIDR_EL1 is masked to get variant and revision fields, then
compared against midr_range_min and midr_range_max when checking
whether CPU is affected by any particular erratum. However, variant
and revision fields in MIDR_EL1 are separated by 16 bits, so the min
and max of midr range should be constructed accordingly, otherwise
the patch will not be applied when variant field is non-0.

Acked-by: Andre Przywara <andre.przywara@....com>
Reviewed-by: Paul Walmsley <paul@...an.com>
Signed-off-by: Bo Yan <byan@...dia.com>
[will: use MIDR_VARIANT_SHIFT to construct upper bound]
Signed-off-by: Will Deacon <will.deacon@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm64/kernel/cpu_errata.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/arch/arm64/kernel/cpu_errata.c
+++ b/arch/arm64/kernel/cpu_errata.c
@@ -88,7 +88,8 @@ struct arm64_cpu_capabilities arm64_erra
 	/* Cortex-A57 r0p0 - r1p2 */
 		.desc = "ARM erratum 832075",
 		.capability = ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE,
-		MIDR_RANGE(MIDR_CORTEX_A57, 0x00, 0x12),
+		MIDR_RANGE(MIDR_CORTEX_A57, 0x00,
+			   (1 << MIDR_VARIANT_SHIFT) | 2),
 	},
 #endif
 	{


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