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nommu: there is no mlock() for NOMMU, so don't provide the bits

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The mlock() facility does not exist for NOMMU since all mappings are
effectively locked anyway, so we don't make the bits available when
they're not useful.

Signed-off-by: David Howells <[email protected]>
Reviewed-by: KOSAKI Motohiro <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Greg Ungerer <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: Lee Schermerhorn <[email protected]>
Cc: Enrik Berkhan <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
David Howells 2009-03-31 15:23:26 -07:00 • committed by Linus Torvalds
commit 33925b25d2
3 changed files with 26 additions and 10 deletions
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8
mm/internal.h
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@ -63,6 +63,7 @@ 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,
@ -71,6 +72,7 @@ static inline void munlock_vma_pages_all(struct vm_area_struct *vma)
{
munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end);
}
#endif
#ifdef CONFIG_UNEVICTABLE_LRU
/*
@ -90,7 +92,7 @@ static inline void unevictable_migrate_page(struct page *new, struct page *old)
}
#endif
#ifdef CONFIG_UNEVICTABLE_LRU
#ifdef CONFIG_HAVE_MLOCKED_PAGE_BIT
/*
* Called only in fault path via page_evictable() for a new page
* to determine if it's being mapped into a LOCKED vma.
@ -165,7 +167,7 @@ static inline void free_page_mlock(struct page *page)
}
}
#else /* CONFIG_UNEVICTABLE_LRU */
#else /* CONFIG_HAVE_MLOCKED_PAGE_BIT */
static inline int is_mlocked_vma(struct vm_area_struct *v, struct page *p)
{
return 0;
@ -175,7 +177,7 @@ static inline void mlock_vma_page(struct page *page) { }
static inline void mlock_migrate_page(struct page *new, struct page *old) { }
static inline void free_page_mlock(struct page *page) { }
#endif /* CONFIG_UNEVICTABLE_LRU */
#endif /* CONFIG_HAVE_MLOCKED_PAGE_BIT */
/*
* Return the mem_map entry representing the 'offset' subpage within