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mm: CONFIG_MMU for PG_mlocked

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Remove three degrees of obfuscation, left over from when we had
CONFIG_UNEVICTABLE_LRU.  MLOCK_PAGES is CONFIG_HAVE_MLOCKED_PAGE_BIT is
CONFIG_HAVE_MLOCK is CONFIG_MMU.  rmap.o (and memory-failure.o) are only
built when CONFIG_MMU, so don't need such conditions at all.

Somehow, I feel no compulsion to remove the CONFIG_HAVE_MLOCK* lines from
169 defconfigs: leave those to evolve in due course.

Signed-off-by: Hugh Dickins <[email protected]>
Cc: Izik Eidus <[email protected]>
Cc: Andrea Arcangeli <[email protected]>
Cc: Nick Piggin <[email protected]>
Reviewed-by: KOSAKI Motohiro <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: Lee Schermerhorn <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: KAMEZAWA Hiroyuki <[email protected]>
Cc: Wu Fengguang <[email protected]>
Cc: Minchan Kim <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Hugh Dickins 2009-12-14 17:58:59 -08:00 • committed by Linus Torvalds
commit af8e3354b4
6 changed files with 19 additions and 44 deletions
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26
mm/internal.h
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@ -63,17 +63,6 @@ static inline unsigned long page_order(struct page *page)
return page_private(page);
}
#ifdef CONFIG_HAVE_MLOCK
extern long mlock_vma_pages_range(struct vm_area_struct *vma,
unsigned long start, unsigned long end);
extern void munlock_vma_pages_range(struct vm_area_struct *vma,
unsigned long start, unsigned long end);
static inline void munlock_vma_pages_all(struct vm_area_struct *vma)
{
munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end);
}
#endif
/*
* unevictable_migrate_page() called only from migrate_page_copy() to
* migrate unevictable flag to new page.
@ -86,7 +75,16 @@ static inline void unevictable_migrate_page(struct page *new, struct page *old)
SetPageUnevictable(new);
}
#ifdef CONFIG_HAVE_MLOCKED_PAGE_BIT
#ifdef CONFIG_MMU
extern long mlock_vma_pages_range(struct vm_area_struct *vma,
unsigned long start, unsigned long end);
extern void munlock_vma_pages_range(struct vm_area_struct *vma,
unsigned long start, unsigned long end);
static inline void munlock_vma_pages_all(struct vm_area_struct *vma)
{
munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end);
}
/*
* Called only in fault path via page_evictable() for a new page
* to determine if it's being mapped into a LOCKED vma.
@ -144,7 +142,7 @@ static inline void mlock_migrate_page(struct page *newpage, struct page *page)
}
}
#else /* CONFIG_HAVE_MLOCKED_PAGE_BIT */
#else /* !CONFIG_MMU */
static inline int is_mlocked_vma(struct vm_area_struct *v, struct page *p)
{
return 0;
@ -153,7 +151,7 @@ static inline void clear_page_mlock(struct page *page) { }
static inline void mlock_vma_page(struct page *page) { }
static inline void mlock_migrate_page(struct page *new, struct page *old) { }
#endif /* CONFIG_HAVE_MLOCKED_PAGE_BIT */
#endif /* !CONFIG_MMU */
/*
* Return the mem_map entry representing the 'offset' subpage within