linux-kernel - [PATCH 3.12 24/63] ARM: KVM: fix ordering of 64bit coprocessor accesses

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Message-Id: <ec5d9b94fe9eea94587c644ab7d4ca3409b74c7c.1430387326.git.jslaby@suse.cz>
Date:	Thu, 30 Apr 2015 14:11:53 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Marc Zyngier <marc.zyngier@....com>,
	Shannon Zhao <shannon.zhao@...aro.org>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 24/63] ARM: KVM: fix ordering of 64bit coprocessor accesses

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

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

===============

commit 547f781378a22b65c2ab468f235c23001b5924da upstream.

Commit 240e99cbd00a (ARM: KVM: Fix 64-bit coprocessor handling)
added an ordering dependency for the 64bit registers.

The order described is: CRn, CRm, Op1, Op2, 64bit-first.

Unfortunately, the implementation is: CRn, 64bit-first, CRm...

Move the 64bit test to be last in order to match the documentation.

Signed-off-by: Marc Zyngier <marc.zyngier@....com>
Reviewed-by: Christoffer Dall <christoffer.dall@...aro.org>
Acked-by: Catalin Marinas <catalin.marinas@....com>
Signed-off-by: Shannon Zhao <shannon.zhao@...aro.org>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 arch/arm/kvm/coproc.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/arm/kvm/coproc.h b/arch/arm/kvm/coproc.h
index c5ad7ff40c96..8dda870e84f9 100644
--- a/arch/arm/kvm/coproc.h
+++ b/arch/arm/kvm/coproc.h
@@ -135,13 +135,13 @@ static inline int cmp_reg(const struct coproc_reg *i1,
 		return -1;
 	if (i1->CRn != i2->CRn)
 		return i1->CRn - i2->CRn;
-	if (i1->is_64 != i2->is_64)
-		return i2->is_64 - i1->is_64;
 	if (i1->CRm != i2->CRm)
 		return i1->CRm - i2->CRm;
 	if (i1->Op1 != i2->Op1)
 		return i1->Op1 - i2->Op1;
-	return i1->Op2 - i2->Op2;
+	if (i1->Op2 != i2->Op2)
+		return i1->Op2 - i2->Op2;
+	return i2->is_64 - i1->is_64;
 }
 
 
-- 
2.3.5

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