linux-kernel - [PATCH V2] MIPS: change type of asid

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Date:	Wed, 21 May 2014 13:36:03 +0800
From:	Yong Zhang <yong.zhang@...driver.com>
To:	<ralf@...ux-mips.org>, <huawei.libin@...wei.com>
CC:	<linux-mips@...ux-mips.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH V2] MIPS: change type of asid_cache to unsigned long

asid_cache must be unsigned long otherwise on 64bit system
it will become 0 if the value in get_new_mmu_context()
reaches 0xffffffff and in the end the assumption of
ASID_FIRST_VERSION is not true anymore thus leads to
more dangerous things.

Reported-by: libin <huawei.libin@...wei.com>
Signed-off-by: Yong Zhang <yong.zhang@...driver.com>
---

V2<-V1: Add the reporter.

 arch/mips/include/asm/cpu-info.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/mips/include/asm/cpu-info.h b/arch/mips/include/asm/cpu-info.h
index f6299be..ebcc2ed 100644
--- a/arch/mips/include/asm/cpu-info.h
+++ b/arch/mips/include/asm/cpu-info.h
@@ -40,7 +40,7 @@ struct cache_desc {
 
 struct cpuinfo_mips {
 	unsigned int		udelay_val;
-	unsigned int		asid_cache;
+	unsigned long		asid_cache;
 
 	/*
 	 * Capability and feature descriptor structure for MIPS CPU
-- 
1.7.9.5

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