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sh: Add a PG_dcache_dirty sanity check in kmap_coherent().

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This plugs in a BUG_ON() in kmap_coherent() for PG_dcache_dirty pages
to catch when things go horribly wrong. Copied from the MIPS
implementation.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2009-08-04 15:57:44 +09:00
parent 3ed6e12939
commit 700487c158
1 changed files with 2 additions and 0 deletions
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2
arch/sh/mm/pg-mmu.c
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@ -37,6 +37,8 @@ static inline void *kmap_coherent(struct page *page, unsigned long addr)
unsigned long vaddr, flags;
pte_t pte;
BUG_ON(test_bit(PG_dcache_dirty, &page->flags));
inc_preempt_count();
idx = (addr & current_cpu_data.dcache.alias_mask) >> PAGE_SHIFT;