The patch titled
swapoff: use atomic_inc_not_zero() on mm_users
has been removed from the -mm tree. Its filename is
swapoff-atomic_inc_not_zero-on-mm_users.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: swapoff: use atomic_inc_not_zero() on mm_users
From: Hugh Dickins <hugh@xxxxxxxxxxx>
Now that we have atomic_inc_not_zero, it's more elegant for try_to_unuse to
use that on mm_users: doesn't actually matter at present, but safer to be
sure that once mm_users has gone to 0, nothing raises it for an instant.
Signed-off-by: Hugh Dickins <hugh@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
mm/swapfile.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff -puN mm/swapfile.c~swapoff-atomic_inc_not_zero-on-mm_users mm/swapfile.c
--- a/mm/swapfile.c~swapoff-atomic_inc_not_zero-on-mm_users
+++ a/mm/swapfile.c
@@ -772,10 +772,8 @@ static int try_to_unuse(unsigned int typ
while (*swap_map > 1 && !retval &&
(p = p->next) != &start_mm->mmlist) {
mm = list_entry(p, struct mm_struct, mmlist);
- if (atomic_inc_return(&mm->mm_users) == 1) {
- atomic_dec(&mm->mm_users);
+ if (!atomic_inc_not_zero(&mm->mm_users))
continue;
- }
spin_unlock(&mmlist_lock);
mmput(prev_mm);
prev_mm = mm;
_
Patches currently in -mm which might be from hugh@xxxxxxxxxxx are
origin.patch
mm-vm_bug_on.patch
mm-remove-vm_locked-before-remap_pfn_range-and-drop-vm_shm.patch
page-migration-support-a-vma-migration-function.patch
allow-migration-of-mlocked-pages.patch
-
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