mm: copy over oom_adj value at fork time

Fix a post-2.6.31 regression which was introduced by
2ff05b2b4eac2e63d345fc731ea151a060247f53 ("oom: move oom_adj value from
task_struct to mm_struct").

After moving the oom_adj value from the task struct to the mm_struct, the
oom_adj value was no longer properly inherited by child processes.

Copying over the oom_adj value at fork time fixes that bug.

[[email protected]: test for current->mm before dereferencing it]
Signed-off-by: Rik van Riel <[email protected]>
Reported-by: Paul Menage <[email protected]>
Cc: KOSAKI Motohiro <[email protected]>
Acked-by: David Rientjes <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

diff --git a/kernel/fork.c b/kernel/fork.c
index 9b42695f0d1484a1a7ee405b9aa73996d29da7ae..29b532e718f7cf0a9055e9564fc265b6f7922cf2 100644 (file)
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -426,6 +426,7 @@ static struct mm_struct * mm_init(struct mm_struct * mm, struct task_struct *p)
        init_rwsem(&mm->mmap_sem);
        INIT_LIST_HEAD(&mm->mmlist);
        mm->flags = (current->mm) ? current->mm->flags : default_dump_filter;
+       mm->oom_adj = (current->mm) ? current->mm->oom_adj : 0;
        mm->core_state = NULL;
        mm->nr_ptes = 0;
        set_mm_counter(mm, file_rss, 0);