Eric Lee / smarc-ti-linux-kernel

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Commit 70af7c5c6492ef6ad137dbff6c4568c73edbcaf0

Authored by Hugh Dickins
Committed by Linus Torvalds
1 parent 9637a5efd4
Exists in master and in 20 other branches dlt-processor-sdk-linux-03.00.00.04, newt-ti-linux-3.12.y, processor-sdk-linux-01.00.00, processor-sdk-linux-02.00.01, smarc-ti-linux-3.12.10, smarc-ti-linux-3.12.y, smarc-ti-linux-3.14.y, smarc-ti-linux-3.15.y, smarc-ti-lsk-linux-4.1.y, smarct3x-processor-sdk-04.01.00.06, smarct3x-processor-sdk-linux-02.00.01, smarct3x-processor-sdk-linux-03.00.00.04, smarct4x-800-processor-sdk-linux-02.00.01, smarct4x-processor-sdk-04.01.00.06, smarct4x-processor-sdk-linux-02.00.01, smarct4x-processor-sdk-linux-03.00.00.04, ti-linux-3.12.y, ti-linux-3.14.y, ti-linux-3.15.y, ti-lsk-linux-4.1.y

[PATCH] swapoff: use atomic_inc_not_zero() on mm_users 

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@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Showing 1 changed file with 1 additions and 3 deletions Side-by-side Diff

... ... @@ -772,10 +772,8 @@
772 772 while (*swap_map > 1 && !retval &&
773 773 (p = p->next) != &start_mm->mmlist) {
774 774 mm = list_entry(p, struct mm_struct, mmlist);
775   - if (atomic_inc_return(&mm->mm_users) == 1) {
776   - atomic_dec(&mm->mm_users);
  775 + if (!atomic_inc_not_zero(&mm->mm_users))
777 776 continue;
778   - }
779 777 spin_unlock(&mmlist_lock);
780 778 mmput(prev_mm);
781 779 prev_mm = mm;