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

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>
git-mirror · Aug 4, 2009 · 700487c · 700487c
1 parent 3ed6e12
commit 700487c
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/arch/sh/mm/pg-mmu.c b/arch/sh/mm/pg-mmu.c
@@ -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;