sh: Assume new page cache pages have dirty dcache lines.
This follows the ARM change c01778001a4f5ad9c62d882776235f3f31922fdd
("ARM: 6379/1: Assume new page cache pages have dirty D-cache") for the
same rationale:
There are places in Linux where writes to newly allocated page
cache pages happen without a subsequent call to flush_dcache_page()
(several PIO drivers including USB HCD). This patch changes the
meaning of PG_arch_1 to be PG_dcache_clean and always flush the
D-cache for a newly mapped page in update_mmu_cache().
This addresses issues seen with executing binaries from MMC, in
addition to some of the other HCDs that don't explicitly do cache
management for their pipe-in buffers.
Requested-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/mm/kmap.c b/arch/sh/mm/kmap.c
index 15d74ea42..ec29e14 100644
--- a/arch/sh/mm/kmap.c
+++ b/arch/sh/mm/kmap.c
@@ -34,7 +34,7 @@
enum fixed_addresses idx;
unsigned long vaddr;
- BUG_ON(test_bit(PG_dcache_dirty, &page->flags));
+ BUG_ON(!test_bit(PG_dcache_clean, &page->flags));
pagefault_disable();