static inline void SetPageUptodate(struct page *page)
{
-#ifdef CONFIG_S390
- if (!test_and_set_bit(PG_uptodate, &page->flags))
- page_set_storage_key(page_to_phys(page), PAGE_DEFAULT_KEY, 0);
-#else
/*
* Memory barrier must be issued before setting the PG_uptodate bit,
* so that all previous stores issued in order to bring the page
* uptodate are actually visible before PageUptodate becomes true.
- *
- * s390 doesn't need an explicit smp_wmb here because the test and
- * set bit already provides full barriers.
*/
smp_wmb();
set_bit(PG_uptodate, &(page)->flags);
-#endif
}
CLEARPAGEFLAG(Uptodate, uptodate)
* pages on the LRU and/or pagecache.
*/
TESTPAGEFLAG(Compound, compound)
-__PAGEFLAG(Head, compound)
+__SETPAGEFLAG(Head, compound) __CLEARPAGEFLAG(Head, compound)
/*
* PG_reclaim is used in combination with PG_compound to mark the
* PG_compound & PG_reclaim => Tail page
* PG_compound & ~PG_reclaim => Head page
*/
+#define PG_head_mask ((1L << PG_compound))
#define PG_head_tail_mask ((1L << PG_compound) | (1L << PG_reclaim))
+static inline int PageHead(struct page *page)
+{
+ return ((page->flags & PG_head_tail_mask) == PG_head_mask);
+}
+
static inline int PageTail(struct page *page)
{
return ((page->flags & PG_head_tail_mask) == PG_head_tail_mask);