linux-kernel - [PATCH 06/10] MIPS: ensure Config5.UFE is clear on boot

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Date:	Thu, 11 Sep 2014 08:30:19 +0100
From:	Paul Burton <paul.burton@...tec.com>
To:	<linux-mips@...ux-mips.org>
CC:	Alexander Viro <viro@...iv.linux.org.uk>,
	<linux-fsdevel@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Paul Burton <paul.burton@...tec.com>
Subject: [PATCH 06/10] MIPS: ensure Config5.UFE is clear on boot

As is done for UFR, ensure that userland cannot directly manipulate the
mode by clearing the UFE bit during boot.

Signed-off-by: Paul Burton <paul.burton@...tec.com>
---
 arch/mips/kernel/cpu-probe.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index db929a0..4e2a6e0 100644
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -400,7 +400,7 @@ static inline unsigned int decode_config5(struct cpuinfo_mips *c)
 	unsigned int config5;
 
 	config5 = read_c0_config5();
-	config5 &= ~MIPS_CONF5_UFR;
+	config5 &= ~(MIPS_CONF5_UFR | MIPS_CONF5_UFE);
 	write_c0_config5(config5);
 
 	if (config5 & MIPS_CONF5_EVA)
-- 
2.0.4

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