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page-flags: define behavior of FS/IO-related flags on compound pages

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It seems we don't have compound page on FS/IO path currently.  Use
PF_NO_COMPOUND to catch if we have.

The odd exception is PG_dirty: sound uses compound pages and maps them
with PTEs.  PF_NO_COMPOUND triggers VM_BUG_ON() in set_page_dirty() on
handling shared fault.  Let's use PF_HEAD for PG_dirty.

Signed-off-by: Kirill A. Shutemov <[email protected]>
Cc: Andrea Arcangeli <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: Mel Gorman <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: Naoya Horiguchi <[email protected]>
Cc: Steve Capper <[email protected]>
Cc: "Aneesh Kumar K.V" <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Jerome Marchand <[email protected]>
Cc: Jérôme Glisse <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Kirill A. Shutemov authored and Linus Torvalds committed 2016-01-15 17:56:32 -08:00
1 parent 48c935ad88
commit df8c94d13c
1 file changed
+13 -10
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include/linux/page-flags.h
+13 -10
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@@ -257,16 +257,16 @@ static inline int __TestClearPage##uname(struct page *page) { return 0; }
TESTSETFLAG_FALSE(uname) TESTCLEARFLAG_FALSE(uname)
__PAGEFLAG(Locked, locked, PF_NO_TAIL)
PAGEFLAG(Error, error, PF_ANY) TESTCLEARFLAG(Error, error, PF_ANY)
PAGEFLAG(Error, error, PF_NO_COMPOUND) TESTCLEARFLAG(Error, error, PF_NO_COMPOUND)
PAGEFLAG(Referenced, referenced, PF_ANY) TESTCLEARFLAG(Referenced, referenced, PF_ANY)
__SETPAGEFLAG(Referenced, referenced, PF_ANY)
PAGEFLAG(Dirty, dirty, PF_ANY) TESTSCFLAG(Dirty, dirty, PF_ANY)
__CLEARPAGEFLAG(Dirty, dirty, PF_ANY)
PAGEFLAG(Dirty, dirty, PF_HEAD) TESTSCFLAG(Dirty, dirty, PF_HEAD)
__CLEARPAGEFLAG(Dirty, dirty, PF_HEAD)
PAGEFLAG(LRU, lru, PF_ANY) __CLEARPAGEFLAG(LRU, lru, PF_ANY)
PAGEFLAG(Active, active, PF_ANY) __CLEARPAGEFLAG(Active, active, PF_ANY)
TESTCLEARFLAG(Active, active, PF_ANY)
__PAGEFLAG(Slab, slab, PF_ANY)
PAGEFLAG(Checked, checked, PF_ANY) /* Used by some filesystems */
PAGEFLAG(Checked, checked, PF_NO_COMPOUND) /* Used by some filesystems */
PAGEFLAG(Pinned, pinned, PF_ANY) TESTSCFLAG(Pinned, pinned, PF_ANY) /* Xen */
PAGEFLAG(SavePinned, savepinned, PF_ANY); /* Xen */
PAGEFLAG(Foreign, foreign, PF_ANY); /* Xen */
@@ -292,12 +292,15 @@ PAGEFLAG(OwnerPriv1, owner_priv_1, PF_ANY)
* Only test-and-set exist for PG_writeback. The unconditional operators are
* risky: they bypass page accounting.
*/
TESTPAGEFLAG(Writeback, writeback, PF_ANY) TESTSCFLAG(Writeback, writeback, PF_ANY)
PAGEFLAG(MappedToDisk, mappedtodisk, PF_ANY)
TESTPAGEFLAG(Writeback, writeback, PF_NO_COMPOUND)
TESTSCFLAG(Writeback, writeback, PF_NO_COMPOUND)
PAGEFLAG(MappedToDisk, mappedtodisk, PF_NO_COMPOUND)
/* PG_readahead is only used for reads; PG_reclaim is only for writes */
PAGEFLAG(Reclaim, reclaim, PF_ANY) TESTCLEARFLAG(Reclaim, reclaim, PF_ANY)
PAGEFLAG(Readahead, reclaim, PF_ANY) TESTCLEARFLAG(Readahead, reclaim, PF_ANY)
PAGEFLAG(Reclaim, reclaim, PF_NO_COMPOUND)
TESTCLEARFLAG(Reclaim, reclaim, PF_NO_COMPOUND)
PAGEFLAG(Readahead, reclaim, PF_NO_COMPOUND)
TESTCLEARFLAG(Readahead, reclaim, PF_NO_COMPOUND)
#ifdef CONFIG_HIGHMEM
/*
@@ -413,7 +416,7 @@ static inline int PageUptodate(struct page *page)
static inline void __SetPageUptodate(struct page *page)
{
smp_wmb();
__set_bit(PG_uptodate, &(page)->flags);
__set_bit(PG_uptodate, &page->flags);
}
static inline void SetPageUptodate(struct page *page)
@@ -424,7 +427,7 @@ static inline void SetPageUptodate(struct page *page)
* uptodate are actually visible before PageUptodate becomes true.
*/
smp_wmb();
set_bit(PG_uptodate, &(page)->flags);
set_bit(PG_uptodate, &page->flags);
}
CLEARPAGEFLAG(Uptodate, uptodate, PF_ANY)