The block in sys_swapon which does the final adjustments to the
swap_info_struct and to swap_list is the same as the block which
re-inserts it again at sys_swapoff on failure of try_to_unuse(), except
for the order of the operations within the lock. Since the order should
not matter, arbitrarily change sys_swapoff to match sys_swapon, in
preparation to making both share the same code.
Signed-off-by: Cesar Eduardo Barros <cesarb@xxxxxxxxxx>
---
mm/swapfile.c | 7 ++++---
1 files changed, 4 insertions(+), 3 deletions(-)
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 33f9102..c9825aa 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -1625,6 +1625,10 @@ SYSCALL_DEFINE1(swapoff, const char __user *, specialfile)
spin_lock(&swap_lock);
if (p->prio < 0)
p->prio = --least_priority;
+ p->flags |= SWP_WRITEOK;
+ nr_swap_pages += p->pages;
+ total_swap_pages += p->pages;
+
prev = -1;
for (i = swap_list.head; i >= 0; i = swap_info[i]->next) {
if (p->prio >= swap_info[i]->prio)
@@ -1636,9 +1640,6 @@ SYSCALL_DEFINE1(swapoff, const char __user *, specialfile)
swap_list.head = swap_list.next = type;
else
swap_info[prev]->next = type;
- nr_swap_pages += p->pages;
- total_swap_pages += p->pages;
- p->flags |= SWP_WRITEOK;
spin_unlock(&swap_lock);
goto out_dput;
}
--
1.7.4
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