提交 2ed21dae 编写于 作者: V Vineet Gupta

ARC: [mm] Assume pagecache page dirty by default

Similar to ARM/SH
Signed-off-by: NVineet Gupta <vgupta@synopsys.com>
上级 fedf5b9b
...@@ -80,6 +80,13 @@ void flush_anon_page(struct vm_area_struct *vma, ...@@ -80,6 +80,13 @@ void flush_anon_page(struct vm_area_struct *vma,
#endif /* CONFIG_ARC_CACHE_VIPT_ALIASING */ #endif /* CONFIG_ARC_CACHE_VIPT_ALIASING */
/*
* A new pagecache page has PG_arch_1 clear - thus dcache dirty by default
* This works around some PIO based drivers which don't call flush_dcache_page
* to record that they dirtied the dcache
*/
#define PG_dc_clean PG_arch_1
/* /*
* Simple wrapper over config option * Simple wrapper over config option
* Bootup code ensures that hardware matches kernel configuration * Bootup code ensures that hardware matches kernel configuration
......
...@@ -512,7 +512,7 @@ void flush_dcache_page(struct page *page) ...@@ -512,7 +512,7 @@ void flush_dcache_page(struct page *page)
struct address_space *mapping; struct address_space *mapping;
if (!cache_is_vipt_aliasing()) { if (!cache_is_vipt_aliasing()) {
set_bit(PG_arch_1, &page->flags); clear_bit(PG_dc_clean, &page->flags);
return; return;
} }
...@@ -526,7 +526,7 @@ void flush_dcache_page(struct page *page) ...@@ -526,7 +526,7 @@ void flush_dcache_page(struct page *page)
* Make a note that K-mapping is dirty * Make a note that K-mapping is dirty
*/ */
if (!mapping_mapped(mapping)) { if (!mapping_mapped(mapping)) {
set_bit(PG_arch_1, &page->flags); clear_bit(PG_dc_clean, &page->flags);
} else if (page_mapped(page)) { } else if (page_mapped(page)) {
/* kernel reading from page with U-mapping */ /* kernel reading from page with U-mapping */
...@@ -734,7 +734,7 @@ void copy_user_highpage(struct page *to, struct page *from, ...@@ -734,7 +734,7 @@ void copy_user_highpage(struct page *to, struct page *from,
* non copied user pages (e.g. read faults which wire in pagecache page * non copied user pages (e.g. read faults which wire in pagecache page
* directly). * directly).
*/ */
set_bit(PG_arch_1, &to->flags); clear_bit(PG_dc_clean, &to->flags);
/* /*
* if SRC was already usermapped and non-congruent to kernel mapping * if SRC was already usermapped and non-congruent to kernel mapping
...@@ -742,16 +742,16 @@ void copy_user_highpage(struct page *to, struct page *from, ...@@ -742,16 +742,16 @@ void copy_user_highpage(struct page *to, struct page *from,
*/ */
if (clean_src_k_mappings) { if (clean_src_k_mappings) {
__flush_dcache_page(kfrom, kfrom); __flush_dcache_page(kfrom, kfrom);
clear_bit(PG_arch_1, &from->flags); set_bit(PG_dc_clean, &from->flags);
} else { } else {
set_bit(PG_arch_1, &from->flags); clear_bit(PG_dc_clean, &from->flags);
} }
} }
void clear_user_page(void *to, unsigned long u_vaddr, struct page *page) void clear_user_page(void *to, unsigned long u_vaddr, struct page *page)
{ {
clear_page(to); clear_page(to);
set_bit(PG_arch_1, &page->flags); clear_bit(PG_dc_clean, &page->flags);
} }
......
...@@ -453,7 +453,7 @@ void update_mmu_cache(struct vm_area_struct *vma, unsigned long vaddr_unaligned, ...@@ -453,7 +453,7 @@ void update_mmu_cache(struct vm_area_struct *vma, unsigned long vaddr_unaligned,
if ((vma->vm_flags & VM_EXEC) || if ((vma->vm_flags & VM_EXEC) ||
addr_not_cache_congruent(paddr, vaddr)) { addr_not_cache_congruent(paddr, vaddr)) {
int dirty = test_and_clear_bit(PG_arch_1, &page->flags); int dirty = !test_and_set_bit(PG_dc_clean, &page->flags);
if (dirty) { if (dirty) {
/* wback + inv dcache lines */ /* wback + inv dcache lines */
__flush_dcache_page(paddr, paddr); __flush_dcache_page(paddr, paddr);
......
Markdown is supported
0% .
You are about to add 0 people to the discussion. Proceed with caution.
先完成此消息的编辑!
想要评论请 注册