From a913e182ab9484308e870af37a14d372742d53b0 Mon Sep 17 00:00:00 2001
From: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Date: Mon, 21 Sep 2009 17:02:26 -0700
Subject: [PATCH] ksm: clean up obsolete references
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>
---
include/linux/ksm.h | 20 --------------------
mm/ksm.c | 14 +++++++++++++-
mm/mmap.c | 1 -
3 files changed, 13 insertions(+), 22 deletions(-)
diff --git a/include/linux/ksm.h b/include/linux/ksm.h
index 0e26de6adb51..a485c14ecd5d 100644
--- a/include/linux/ksm.h
+++ b/include/linux/ksm.h
@@ -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)
{
}
diff --git a/mm/ksm.c b/mm/ksm.c
index 3bd54ce9eb38..e11e7a5ac84f 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -32,7 +32,6 @@
#include <linux/mmu_notifier.h>
#include <linux/ksm.h>
-#include <asm/tlb.h>
#include <asm/tlbflush.h>
/*
@@ -284,6 +283,19 @@ static inline int in_stable_tree(struct rmap_item *rmap_item)
return rmap_item->address & STABLE_FLAG;
}
+/*
+ * ksmd, and unmerge_and_remove_all_rmap_items(), must not touch an mm's
+ * page tables after it has passed through ksm_exit() - which, if necessary,
+ * takes mmap_sem briefly to serialize against them. ksm_exit() does not set
+ * a special flag: they can just back out as soon as mm_users goes to zero.
+ * ksm_test_exit() is used throughout to make this test for exit: in some
+ * places for correctness, in some places just to avoid unnecessary work.
+ */
+static inline bool ksm_test_exit(struct mm_struct *mm)
+{
+ return atomic_read(&mm->mm_users) == 0;
+}
+
/*
* We use break_ksm to break COW on a ksm page: it's a stripped down
*
diff --git a/mm/mmap.c b/mm/mmap.c
index 22dff49d579e..6eed98c00543 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -27,7 +27,6 @@
#include <linux/mount.h>
#include <linux/mempolicy.h>
#include <linux/rmap.h>
-#include <linux/ksm.h>
#include <linux/mmu_notifier.h>
#include <linux/perf_event.h>
--
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