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authorRalf Baechle <ralf@linux-mips.org>2008-06-14 22:22:08 +0100
committerRalf Baechle <ralf@linux-mips.org>2008-06-16 15:14:48 +0100
commitc9c5023d83df5dc7d58830a63fd0e082120f00e3 (patch)
tree7c0bc5cca357aae84e8bb6c0544da5b04ea6d77b /arch/mips/mm
parent0c3bd83b0974238a5808d342663c6407512564d0 (diff)
downloadop-kernel-dev-c9c5023d83df5dc7d58830a63fd0e082120f00e3.zip
op-kernel-dev-c9c5023d83df5dc7d58830a63fd0e082120f00e3.tar.gz
[MIPS] Fix buggy use of kmap_coherent.
Assuming the call of kmap_coherent in local_r4k_flush_cache_page doesn't need fixing this was skipped in fcae549295bcae801ac48fc1c2030ab8cc487020. Turns out it needed the same change after all. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/mm')
-rw-r--r--arch/mips/mm/c-r4k.c7
1 files changed, 5 insertions, 2 deletions
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);
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