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-rw-r--r--arch/arm/include/asm/cacheflush.h6
-rw-r--r--arch/arm/include/asm/tlbflush.h2
-rw-r--r--arch/arm/mm/copypage-v4mc.c2
-rw-r--r--arch/arm/mm/copypage-v6.c2
-rw-r--r--arch/arm/mm/copypage-xscale.c2
-rw-r--r--arch/arm/mm/dma-mapping.c6
-rw-r--r--arch/arm/mm/fault-armv.c4
-rw-r--r--arch/arm/mm/flush.c3
8 files changed, 17 insertions, 10 deletions
diff --git a/arch/arm/include/asm/cacheflush.h b/arch/arm/include/asm/cacheflush.h
index 4656a24058d2..d3730f0f4b50 100644
--- a/arch/arm/include/asm/cacheflush.h
+++ b/arch/arm/include/asm/cacheflush.h
@@ -137,10 +137,10 @@
#endif
/*
- * This flag is used to indicate that the page pointed to by a pte
- * is dirty and requires cleaning before returning it to the user.
+ * This flag is used to indicate that the page pointed to by a pte is clean
+ * and does not require cleaning before returning it to the user.
*/
-#define PG_dcache_dirty PG_arch_1
+#define PG_dcache_clean PG_arch_1
/*
* MM Cache Management
diff --git a/arch/arm/include/asm/tlbflush.h b/arch/arm/include/asm/tlbflush.h
index 33b546ae72d4..9ad329ad7458 100644
--- a/arch/arm/include/asm/tlbflush.h
+++ b/arch/arm/include/asm/tlbflush.h
@@ -560,7 +560,7 @@ extern void flush_tlb_kernel_range(unsigned long start, unsigned long end);
#endif
/*
- * if PG_dcache_dirty is set for the page, we need to ensure that any
+ * If PG_dcache_clean is not set for the page, we need to ensure that any
* cache entries for the kernels virtual memory range are written
* back to the page.
*/
diff --git a/arch/arm/mm/copypage-v4mc.c b/arch/arm/mm/copypage-v4mc.c
index 598c51ad5071..b8061519ce77 100644
--- a/arch/arm/mm/copypage-v4mc.c
+++ b/arch/arm/mm/copypage-v4mc.c
@@ -73,7 +73,7 @@ void v4_mc_copy_user_highpage(struct page *to, struct page *from,
{
void *kto = kmap_atomic(to, KM_USER1);
- if (test_and_clear_bit(PG_dcache_dirty, &from->flags))
+ if (!test_and_set_bit(PG_dcache_clean, &from->flags))
__flush_dcache_page(page_mapping(from), from);
spin_lock(&minicache_lock);
diff --git a/arch/arm/mm/copypage-v6.c b/arch/arm/mm/copypage-v6.c
index f55fa1044f72..bdba6c65c901 100644
--- a/arch/arm/mm/copypage-v6.c
+++ b/arch/arm/mm/copypage-v6.c
@@ -79,7 +79,7 @@ static void v6_copy_user_highpage_aliasing(struct page *to,
unsigned int offset = CACHE_COLOUR(vaddr);
unsigned long kfrom, kto;
- if (test_and_clear_bit(PG_dcache_dirty, &from->flags))
+ if (!test_and_set_bit(PG_dcache_clean, &from->flags))
__flush_dcache_page(page_mapping(from), from);
/* FIXME: not highmem safe */
diff --git a/arch/arm/mm/copypage-xscale.c b/arch/arm/mm/copypage-xscale.c
index 9920c0ae2096..649bbcd325bf 100644
--- a/arch/arm/mm/copypage-xscale.c
+++ b/arch/arm/mm/copypage-xscale.c
@@ -95,7 +95,7 @@ void xscale_mc_copy_user_highpage(struct page *to, struct page *from,
{
void *kto = kmap_atomic(to, KM_USER1);
- if (test_and_clear_bit(PG_dcache_dirty, &from->flags))
+ if (!test_and_set_bit(PG_dcache_clean, &from->flags))
__flush_dcache_page(page_mapping(from), from);
spin_lock(&minicache_lock);
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index 4bc43e535d3b..e4dd0646e859 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -523,6 +523,12 @@ void ___dma_page_dev_to_cpu(struct page *page, unsigned long off,
outer_inv_range(paddr, paddr + size);
dma_cache_maint_page(page, off, size, dir, dmac_unmap_area);
+
+ /*
+ * Mark the D-cache clean for this page to avoid extra flushing.
+ */
+ if (dir != DMA_TO_DEVICE && off == 0 && size >= PAGE_SIZE)
+ set_bit(PG_dcache_clean, &page->flags);
}
EXPORT_SYMBOL(___dma_page_dev_to_cpu);
diff --git a/arch/arm/mm/fault-armv.c b/arch/arm/mm/fault-armv.c
index 9b906dec1ca1..58846cbd0e0b 100644
--- a/arch/arm/mm/fault-armv.c
+++ b/arch/arm/mm/fault-armv.c
@@ -141,7 +141,7 @@ make_coherent(struct address_space *mapping, struct vm_area_struct *vma,
* a page table, or changing an existing PTE. Basically, there are two
* things that we need to take care of:
*
- * 1. If PG_dcache_dirty is set for the page, we need to ensure
+ * 1. If PG_dcache_clean is not set for the page, we need to ensure
* that any cache entries for the kernels virtual memory
* range are written back to the page.
* 2. If we have multiple shared mappings of the same space in
@@ -169,7 +169,7 @@ void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr,
mapping = page_mapping(page);
#ifndef CONFIG_SMP
- if (test_and_clear_bit(PG_dcache_dirty, &page->flags))
+ if (!test_and_set_bit(PG_dcache_clean, &page->flags))
__flush_dcache_page(mapping, page);
#endif
if (mapping) {
diff --git a/arch/arm/mm/flush.c b/arch/arm/mm/flush.c
index 87dd5ffdfa2d..b4efce9b7985 100644
--- a/arch/arm/mm/flush.c
+++ b/arch/arm/mm/flush.c
@@ -248,7 +248,7 @@ void flush_dcache_page(struct page *page)
#ifndef CONFIG_SMP
if (mapping && !mapping_mapped(mapping))
- set_bit(PG_dcache_dirty, &page->flags);
+ clear_bit(PG_dcache_clean, &page->flags);
else
#endif
{
@@ -257,6 +257,7 @@ void flush_dcache_page(struct page *page)
__flush_dcache_aliases(mapping, page);
else if (mapping)
__flush_icache_all();
+ set_bit(PG_dcache_clean, &page->flags);
}
}
EXPORT_SYMBOL(flush_dcache_page);
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