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MIPS: dump_tlb: Take EHINV bit into account

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The EHINV bit in EntryHi allows a TLB entry to be properly marked
invalid so that EntryHi doesn't have to be set to a unique value to
avoid machine check exceptions due to multiple matching entries.

Unfortunately dump_tlb() doesn't take this into account so it will print
all the uninteresting invalid TLB entries if the current ASID happens to
be 00. Therefore add a condition to skip entries which are marked
invalid with the EHINV bit.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/10076/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
James Hogan 2015-05-19 09:50:36 +01:00 committed by Ralf Baechle
parent 48269c78fb
commit decebccd76
1 changed files with 3 additions and 0 deletions
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3
arch/mips/lib/dump_tlb.c
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@ -67,6 +67,9 @@ static void dump_tlb(int first, int last)
entrylo0 = read_c0_entrylo0();
entrylo1 = read_c0_entrylo1();
/* EHINV bit marks entire entry as invalid */
if (cpu_has_tlbinv && entryhi & MIPS_ENTRYHI_EHINV)
continue;
/*
* Prior to tlbinv, unused entries have a virtual address of
* CKSEG0.