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>
diff --git a/arch/sh/mm/pg-mmu.c b/arch/sh/mm/pg-mmu.c
index 8602f68..3235120 100644
--- a/arch/sh/mm/pg-mmu.c
+++ b/arch/sh/mm/pg-mmu.c
@@ -37,6 +37,8 @@
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;