On Fri, Jun 13, 2008 at 04:06:03PM +0100, Thomas Horsten wrote:
Only compile tested - can you try this one?
Ralf
Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
diff --git a/arch/mips/mm/c-r4k.c b/arch/mips/mm/c-r4k.c
index c41ea22..2709675 100644
--- a/arch/mips/mm/c-r4k.c
+++ b/arch/mips/mm/c-r4k.c
@@ -446,6 +446,7 @@ static inline void local_r4k_flush_cache_page(void *args)
struct page *page = pfn_to_page(fcp_args->pfn);
int exec = vma->vm_flags & VM_EXEC;
struct mm_struct *mm = vma->vm_mm;
+ int map_coherent = 0;
pgd_t *pgdp;
pud_t *pudp;
pmd_t *pmdp;
@@ -479,7 +480,9 @@ static inline void local_r4k_flush_cache_page(void *args)
* Use kmap_coherent or kmap_atomic to do flushes for
* another ASID than the current one.
*/
- if (cpu_has_dc_aliases)
+ map_coherent = (cpu_has_dc_aliases &&
+ page_mapped(page) && !Page_dcache_dirty(page));
+ if (map_coherent)
vaddr = kmap_coherent(page, addr);
else
vaddr = kmap_atomic(page, KM_USER0);
@@ -502,7 +505,7 @@ static inline void local_r4k_flush_cache_page(void *args)
}
if (vaddr) {
- if (cpu_has_dc_aliases)
+ if (map_coherent)
kunmap_coherent();
else
kunmap_atomic(vaddr, KM_USER0);
