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ksm: clean up obsolete references

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A few cleanups, given the munlock fix: the comment on ksm_test_exit() no
longer applies, and it can be made private to ksm.c; there's no more
reference to mmu_gather or tlb.h, and mmap.c doesn't need ksm.h.

Signed-off-by: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Acked-by: Izik Eidus <ieidus@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Hugh Dickins 2009-09-21 17:02:26 -07:00 • committed by Linus Torvalds
parent 8314c4f24a
commit a913e182ab
3 changed files with 13 additions and 22 deletions
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20
include/linux/ksm.h
View file

@ -12,8 +12,6 @@
#include <linux/sched.h>
#include <linux/vmstat.h>
struct mmu_gather;
#ifdef CONFIG_KSM
int ksm_madvise(struct vm_area_struct *vma, unsigned long start,
unsigned long end, int advice, unsigned long *vm_flags);
@ -27,19 +25,6 @@ static inline int ksm_fork(struct mm_struct *mm, struct mm_struct *oldmm)
return 0;
}
/*
* For KSM to handle OOM without deadlock when it's breaking COW in a
* likely victim of the OOM killer, exit_mmap() has to serialize with
* ksm_exit() after freeing mm's pages but before freeing its page tables.
* That leaves a window in which KSM might refault pages which have just
* been finally unmapped: guard against that with ksm_test_exit(), and
* use it after getting mmap_sem in ksm.c, to check if mm is exiting.
*/
static inline bool ksm_test_exit(struct mm_struct *mm)
{
return atomic_read(&mm->mm_users) == 0;
}
static inline void ksm_exit(struct mm_struct *mm)
{
if (test_bit(MMF_VM_MERGEABLE, &mm->flags))
@ -79,11 +64,6 @@ static inline int ksm_fork(struct mm_struct *mm, struct mm_struct *oldmm)
return 0;
}
static inline bool ksm_test_exit(struct mm_struct *mm)
{
return 0;
}
static inline void ksm_exit(struct mm_struct *mm)
{
}