sh: Use more aggressive dcache purging in kmap teardown.

This fixes up a number of outstanding issues observed with old mappings
on the same colour hanging around. This requires some more optimal
handling, but is a safe fallback until all of the corner cases have been
handled.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/arch/sh/mm/kmap.c b/arch/sh/mm/kmap.c
index c52cd8c40a64..16e01b5fed04 100644
--- a/arch/sh/mm/kmap.c
+++ b/arch/sh/mm/kmap.c
@@ -54,6 +54,9 @@ void kunmap_coherent(void *kvaddr)
 		unsigned long vaddr = (unsigned long)kvaddr & PAGE_MASK;
 		enum fixed_addresses idx = __virt_to_fix(vaddr);
 
+		/* XXX.. Kill this later, here for sanity at the moment.. */
+		__flush_purge_region((void *)vaddr, PAGE_SIZE);
+
 		pte_clear(&init_mm, vaddr, kmap_coherent_pte - idx);
 		local_flush_tlb_one(get_asid(), vaddr);
 	}