MIPS: Ensure Config5.UFE is clear on boot
authorPaul Burton <paul.burton@imgtec.com>
Thu, 11 Sep 2014 07:30:19 +0000 (08:30 +0100)
committerRalf Baechle <ralf@linux-mips.org>
Mon, 24 Nov 2014 06:45:07 +0000 (07:45 +0100)
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@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: linux-fsdevel@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/7677/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
arch/mips/kernel/cpu-probe.c

index d76f189..d68ad96 100644 (file)
@@ -461,7 +461,7 @@ 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)