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|
#ifndef PAGE_FLAGS_H
#define PAGE_FLAGS_H
#include <linux/types.h>
#include <linux/bug.h>
#ifndef __GENERATING_BOUNDS_H
#include <linux/mm_types.h>
#include <generated/bounds.h>
#endif
enum pageflags {
PG_locked,
PG_error,
PG_referenced,
PG_uptodate,
PG_dirty,
PG_lru,
PG_active,
PG_slab,
PG_owner_priv_1,
PG_arch_1,
PG_reserved,
PG_private,
PG_private_2,
PG_writeback,
#ifdef CONFIG_PAGEFLAGS_EXTENDED
PG_head,
PG_tail,
#else
PG_compound,
#endif
PG_swapcache,
PG_mappedtodisk,
PG_reclaim,
PG_swapbacked,
PG_unevictable,
#ifdef CONFIG_MMU
PG_mlocked,
#endif
#ifdef CONFIG_ARCH_USES_PG_UNCACHED
PG_uncached,
#endif
#ifdef CONFIG_MEMORY_FAILURE
PG_hwpoison,
#endif
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
PG_compound_lock,
#endif
PG_readahead, /* page in a readahead window */
__NR_PAGEFLAGS,
PG_checked = PG_owner_priv_1,
PG_fscache = PG_private_2,
PG_pinned = PG_owner_priv_1,
PG_savepinned = PG_dirty,
PG_slob_free = PG_private,
};
#ifndef __GENERATING_BOUNDS_H
#define TESTPAGEFLAG(uname, lname) \
static inline int Page##uname(const struct page *page) \
{ return test_bit(PG_##lname, &page->flags); }
#define SETPAGEFLAG(uname, lname) \
static inline void SetPage##uname(struct page *page) \
{ set_bit(PG_##lname, &page->flags); }
#define CLEARPAGEFLAG(uname, lname) \
static inline void ClearPage##uname(struct page *page) \
{ clear_bit(PG_##lname, &page->flags); }
#define __SETPAGEFLAG(uname, lname) \
static inline void __SetPage##uname(struct page *page) \
{ __set_bit(PG_##lname, &page->flags); }
#define __CLEARPAGEFLAG(uname, lname) \
static inline void __ClearPage##uname(struct page *page) \
{ __clear_bit(PG_##lname, &page->flags); }
#define TESTSETFLAG(uname, lname) \
static inline int TestSetPage##uname(struct page *page) \
{ return test_and_set_bit(PG_##lname, &page->flags); }
#define TESTCLEARFLAG(uname, lname) \
static inline int TestClearPage##uname(struct page *page) \
{ return test_and_clear_bit(PG_##lname, &page->flags); }
#define __TESTCLEARFLAG(uname, lname) \
static inline int __TestClearPage##uname(struct page *page) \
{ return __test_and_clear_bit(PG_##lname, &page->flags); }
#define PAGEFLAG(uname, lname) TESTPAGEFLAG(uname, lname) \
SETPAGEFLAG(uname, lname) CLEARPAGEFLAG(uname, lname)
#define __PAGEFLAG(uname, lname) TESTPAGEFLAG(uname, lname) \
__SETPAGEFLAG(uname, lname) __CLEARPAGEFLAG(uname, lname)
#define PAGEFLAG_FALSE(uname) \
static inline int Page##uname(const struct page *page) \
{ return 0; }
#define TESTSCFLAG(uname, lname) \
TESTSETFLAG(uname, lname) TESTCLEARFLAG(uname, lname)
#define SETPAGEFLAG_NOOP(uname) \
static inline void SetPage##uname(struct page *page) { }
#define CLEARPAGEFLAG_NOOP(uname) \
static inline void ClearPage##uname(struct page *page) { }
#define __CLEARPAGEFLAG_NOOP(uname) \
static inline void __ClearPage##uname(struct page *page) { }
#define TESTCLEARFLAG_FALSE(uname) \
static inline int TestClearPage##uname(struct page *page) { return 0; }
#define __TESTCLEARFLAG_FALSE(uname) \
static inline int __TestClearPage##uname(struct page *page) { return 0; }
struct page;
TESTPAGEFLAG(Locked, locked)
PAGEFLAG(Error, error) TESTCLEARFLAG(Error, error)
PAGEFLAG(Referenced, referenced) TESTCLEARFLAG(Referenced, referenced)
PAGEFLAG(Dirty, dirty) TESTSCFLAG(Dirty, dirty) __CLEARPAGEFLAG(Dirty, dirty)
PAGEFLAG(LRU, lru) __CLEARPAGEFLAG(LRU, lru)
PAGEFLAG(Active, active) __CLEARPAGEFLAG(Active, active)
TESTCLEARFLAG(Active, active)
__PAGEFLAG(Slab, slab)
PAGEFLAG(Checked, checked)
PAGEFLAG(Pinned, pinned) TESTSCFLAG(Pinned, pinned)
PAGEFLAG(SavePinned, savepinned);
PAGEFLAG(Reserved, reserved) __CLEARPAGEFLAG(Reserved, reserved)
PAGEFLAG(SwapBacked, swapbacked) __CLEARPAGEFLAG(SwapBacked, swapbacked)
__PAGEFLAG(SlobFree, slob_free)
PAGEFLAG(Private, private) __SETPAGEFLAG(Private, private)
__CLEARPAGEFLAG(Private, private)
PAGEFLAG(Private2, private_2) TESTSCFLAG(Private2, private_2)
PAGEFLAG(OwnerPriv1, owner_priv_1) TESTCLEARFLAG(OwnerPriv1, owner_priv_1)
TESTPAGEFLAG(Writeback, writeback) TESTSCFLAG(Writeback, writeback)
PAGEFLAG(MappedToDisk, mappedtodisk)
PAGEFLAG(Reclaim, reclaim) TESTCLEARFLAG(Reclaim, reclaim)
PAGEFLAG(Readahead, reclaim)
#ifdef CONFIG_HIGHMEM
#define PageHighMem(__p) is_highmem(page_zone(__p))
#else
PAGEFLAG_FALSE(HighMem)
#endif
#ifdef CONFIG_SWAP
PAGEFLAG(SwapCache, swapcache)
#else
PAGEFLAG_FALSE(SwapCache)
SETPAGEFLAG_NOOP(SwapCache) CLEARPAGEFLAG_NOOP(SwapCache)
#endif
PAGEFLAG(Unevictable, unevictable) __CLEARPAGEFLAG(Unevictable, unevictable)
TESTCLEARFLAG(Unevictable, unevictable)
#ifdef CONFIG_MMU
PAGEFLAG(Mlocked, mlocked) __CLEARPAGEFLAG(Mlocked, mlocked)
TESTSCFLAG(Mlocked, mlocked) __TESTCLEARFLAG(Mlocked, mlocked)
#else
PAGEFLAG_FALSE(Mlocked) SETPAGEFLAG_NOOP(Mlocked)
TESTCLEARFLAG_FALSE(Mlocked) __TESTCLEARFLAG_FALSE(Mlocked)
#endif
#ifdef CONFIG_ARCH_USES_PG_UNCACHED
PAGEFLAG(Uncached, uncached)
#else
PAGEFLAG_FALSE(Uncached)
#endif
#ifdef CONFIG_MEMORY_FAILURE
PAGEFLAG(HWPoison, hwpoison)
TESTSCFLAG(HWPoison, hwpoison)
#define __PG_HWPOISON (1UL << PG_hwpoison)
#else
PAGEFLAG_FALSE(HWPoison)
#define __PG_HWPOISON 0
#endif
u64 stable_page_flags(struct page *page);
static inline int PageUptodate(struct page *page)
{
int ret = test_bit(PG_uptodate, &(page)->flags);
if (ret)
smp_rmb();
return ret;
}
static inline void __SetPageUptodate(struct page *page)
{
smp_wmb();
__set_bit(PG_uptodate, &(page)->flags);
}
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
smp_wmb();
set_bit(PG_uptodate, &(page)->flags);
#endif
}
CLEARPAGEFLAG(Uptodate, uptodate)
extern void cancel_dirty_page(struct page *page, unsigned int account_size);
int test_clear_page_writeback(struct page *page);
int test_set_page_writeback(struct page *page);
static inline void set_page_writeback(struct page *page)
{
test_set_page_writeback(page);
}
#ifdef CONFIG_PAGEFLAGS_EXTENDED
__PAGEFLAG(Head, head) CLEARPAGEFLAG(Head, head)
__PAGEFLAG(Tail, tail)
static inline int PageCompound(struct page *page)
{
return page->flags & ((1L << PG_head) | (1L << PG_tail));
}
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
static inline void ClearPageCompound(struct page *page)
{
BUG_ON(!PageHead(page));
ClearPageHead(page);
}
#endif
#else
TESTPAGEFLAG(Compound, compound)
__PAGEFLAG(Head, compound)
#define PG_head_tail_mask ((1L << PG_compound) | (1L << PG_reclaim))
static inline int PageTail(struct page *page)
{
return ((page->flags & PG_head_tail_mask) == PG_head_tail_mask);
}
static inline void __SetPageTail(struct page *page)
{
page->flags |= PG_head_tail_mask;
}
static inline void __ClearPageTail(struct page *page)
{
page->flags &= ~PG_head_tail_mask;
}
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
static inline void ClearPageCompound(struct page *page)
{
BUG_ON((page->flags & PG_head_tail_mask) != (1 << PG_compound));
clear_bit(PG_compound, &page->flags);
}
#endif
#endif
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
static inline int PageTransHuge(struct page *page)
{
VM_BUG_ON(PageTail(page));
return PageHead(page);
}
static inline int PageTransCompound(struct page *page)
{
return PageCompound(page);
}
static inline int PageTransTail(struct page *page)
{
return PageTail(page);
}
#else
static inline int PageTransHuge(struct page *page)
{
return 0;
}
static inline int PageTransCompound(struct page *page)
{
return 0;
}
static inline int PageTransTail(struct page *page)
{
return 0;
}
#endif
#ifdef CONFIG_MMU
#define __PG_MLOCKED (1 << PG_mlocked)
#else
#define __PG_MLOCKED 0
#endif
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
#define __PG_COMPOUND_LOCK (1 << PG_compound_lock)
#else
#define __PG_COMPOUND_LOCK 0
#endif
#define PAGE_FLAGS_CHECK_AT_FREE \
(1 << PG_lru | 1 << PG_locked | \
1 << PG_private | 1 << PG_private_2 | \
1 << PG_writeback | 1 << PG_reserved | \
1 << PG_slab | 1 << PG_swapcache | 1 << PG_active | \
1 << PG_unevictable | __PG_MLOCKED | __PG_HWPOISON | \
__PG_COMPOUND_LOCK)
#define PAGE_FLAGS_CHECK_AT_PREP ((1 << NR_PAGEFLAGS) - 1)
#define PAGE_FLAGS_PRIVATE \
(1 << PG_private | 1 << PG_private_2)
static inline int page_has_private(struct page *page)
{
return !!(page->flags & PAGE_FLAGS_PRIVATE);
}
#endif
#endif
|
