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MIPS: Don't probe reserved EntryHi bits. 

The patch that adds cpu_probe_vmbits is erroneously writing to reserved
bit 12.  Since we are really only probing high bits, don't write this bit
with a one.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
Cc: Guenter Roeck <guenter.roeck@ericsson.com>
Patchwork: http://patchwork.linux-mips.org/patch/949/
Acked-by: Guenter Roeck <guenter.roeck@ericsson.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
David Daney 2010-02-08 12:27:00 -08:00 committed by Ralf Baechle
parent c2d5b5e525
commit 5b7efa898b
1 changed files with 2 additions and 2 deletions
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4
arch/mips/kernel/cpu-probe.c
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@ -287,9 +287,9 @@ static inline int __cpu_has_fpu(void)
static inline void cpu_probe_vmbits(struct cpuinfo_mips *c)
{
#ifdef __NEED_VMBITS_PROBE
write_c0_entryhi(0x3ffffffffffff000ULL);
write_c0_entryhi(0x3fffffffffffe000ULL);
back_to_back_c0_hazard();
c->vmbits = fls64(read_c0_entryhi() & 0x3ffffffffffff000ULL);
c->vmbits = fls64(read_c0_entryhi() & 0x3fffffffffffe000ULL);
#endif
}