We use PG_uptodate on head pages on transparent huge page.
Let's use NO_TAIL.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
---
include/linux/page-flags.h | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 0b6921d2f2f3..55a69c40e4ae 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -408,8 +408,9 @@ u64 stable_page_flags(struct page *page);
static inline int PageUptodate(struct page *page)
{
- int ret = test_bit(PG_uptodate, &(page)->flags);
-
+ int ret;
+ page = compound_head(page);
+ ret = test_bit(PG_uptodate, &(page)->flags);
/*
* Must ensure that the data we read out of the page is loaded
* _after_ we've loaded page->flags to check for PageUptodate.
@@ -426,12 +427,14 @@ static inline int PageUptodate(struct page *page)
static inline void __SetPageUptodate(struct page *page)
{
+ VM_BUG_ON_PAGE(PageTail(page), page);
smp_wmb();
__set_bit(PG_uptodate, &page->flags);
}
static inline void SetPageUptodate(struct page *page)
{
+ VM_BUG_ON_PAGE(PageTail(page), page);
/*
* Memory barrier must be issued before setting the PG_uptodate bit,
* so that all previous stores issued in order to bring the page
@@ -441,7 +444,7 @@ static inline void SetPageUptodate(struct page *page)
set_bit(PG_uptodate, &page->flags);
}
-CLEARPAGEFLAG(Uptodate, uptodate, ANY)
+CLEARPAGEFLAG(Uptodate, uptodate, NO_TAIL)
int test_clear_page_writeback(struct page *page);
int __test_set_page_writeback(struct page *page, bool keep_write);
--
2.1.4
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@xxxxxxxxx. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>