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ARC: Fix bogus gcc warning and micro-optimise TLB iteration loop 

------------------>8----------------------
arch/arc/mm/tlb.c: In function ‘do_tlb_overlap_fault’:
arch/arc/mm/tlb.c:688:13: warning: array subscript is above array bounds
[-Warray-bounds]
         (pd0[n] & PAGE_MASK)) {
             ^
------------------>8----------------------

While at it, remove the usless last iteration of outer loop when reading
a TLB SET for duplicate entries.

Suggested-by: Mischa Jonker <mjonker@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
This commit is contained in:
Vineet Gupta 2013-09-27 18:20:06 +05:30
parent 0dafafc3ef
commit 0a4c40a3b7
1 changed files with 2 additions and 2 deletions
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4
arch/arc/mm/tlb.c
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@ -610,9 +610,9 @@ void do_tlb_overlap_fault(unsigned long cause, unsigned long address,
struct pt_regs *regs)
{
int set, way, n;
unsigned int pd0[4], pd1[4]; /* assume max 4 ways */
unsigned long flags, is_valid;
struct cpuinfo_arc_mmu *mmu = &cpuinfo_arc700[smp_processor_id()].mmu;
unsigned int pd0[mmu->ways], pd1[mmu->ways];
local_irq_save(flags);
@ -637,7 +637,7 @@ void do_tlb_overlap_fault(unsigned long cause, unsigned long address,
continue;
/* Scan the set for duplicate ways: needs a nested loop */
for (way = 0; way < mmu->ways; way++) {
for (way = 0; way < mmu->ways - 1; way++) {
if (!pd0[way])
continue;