diff options
author | Oleg Nesterov <oleg@tv-sign.ru> | 2008-07-25 12:47:38 +0400 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-07-25 21:53:39 +0400 |
commit | 246bb0b1deb29726990620d8b5e55ca29f331362 (patch) | |
tree | 5173b9e0c1d18934a8b2693c690a7162acb1bca8 /fs/exec.c | |
parent | 7b34e4283c685f5cc6ba6d30e939906eee0d4bcf (diff) | |
download | linux-246bb0b1deb29726990620d8b5e55ca29f331362.tar.xz |
kill PF_BORROWED_MM in favour of PF_KTHREAD
Kill PF_BORROWED_MM. Change use_mm/unuse_mm to not play with ->flags, and
do s/PF_BORROWED_MM/PF_KTHREAD/ for a couple of other users.
No functional changes yet. But this allows us to do further
fixes/cleanups.
oom_kill/ptrace/etc often check "p->mm != NULL" to filter out the
kthreads, this is wrong because of use_mm(). The problem with
PF_BORROWED_MM is that we need task_lock() to avoid races. With this
patch we can check PF_KTHREAD directly, or use a simple lockless helper:
/* The result must not be dereferenced !!! */
struct mm_struct *__get_task_mm(struct task_struct *tsk)
{
if (tsk->flags & PF_KTHREAD)
return NULL;
return tsk->mm;
}
Note also ecard_task(). It runs with ->mm != NULL, but it's the kernel
thread without PF_BORROWED_MM.
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/exec.c')
0 files changed, 0 insertions, 0 deletions