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authorGreg Ungerer <gerg@snapgear.com>2009-05-20 02:12:32 -0400
committerRalf Baechle <ralf@linux-mips.org>2009-05-20 13:53:14 -0400
commita5e696e5d0f1377ff6beb10d2f40edb6a3d1de18 (patch)
tree2f7b194c53e9a7e2ab6c8b58335c299a897231fe /arch/mips/mm/tlb-r8k.c
parent195d1a96ae5fdfbedb8dc4b97afee578921fa99e (diff)
MIPS: 64-bit: Fix system lockup.
The address range size calculation inside local_flush_tlb_kernel_range() is being truncated by a too small size variable holder on 64-bit systems. The truncated size can result in an erroneous tlbsize check that means we sit spinning inside a loop trying to flush a hige number of TLB entries. This is for all intents and purposes a system hang. Fix by using an appropriately sized valiable to hold the size. [Ralf: Greg's original patch submission identified the issue and fixed one instance in tlb-r4k.c but there there were several more. For consistency I also modified tlb-r3k.c even though that file is only used on 32-bit.] Signed-off-by: Greg Ungerer <gerg@snapgear.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/mm/tlb-r8k.c')
-rw-r--r--arch/mips/mm/tlb-r8k.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/mips/mm/tlb-r8k.c b/arch/mips/mm/tlb-r8k.c
index 4f01a3be215c..4ec95cc2df2f 100644
--- a/arch/mips/mm/tlb-r8k.c
+++ b/arch/mips/mm/tlb-r8k.c
@@ -111,8 +111,7 @@ out_restore:
111/* Usable for KV1 addresses only! */ 111/* Usable for KV1 addresses only! */
112void local_flush_tlb_kernel_range(unsigned long start, unsigned long end) 112void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)
113{ 113{
114 unsigned long flags; 114 unsigned long size, flags;
115 int size;
116 115
117 size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT; 116 size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
118 size = (size + 1) >> 1; 117 size = (size + 1) >> 1;