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| author | Jiri Slaby <jslaby@suse.cz> | 2010-03-05 13:41:44 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-03-06 11:26:24 -0800 |
| commit | 59e99e5b9706867f18d4a36c1e4645fbaacbec2e (patch) | |
| tree | e977fb5eecccf1446296fd196072bd1287b0a92f /mm/mlock.c | |
| parent | 06f9d8c2b50060543fb6e0af87ddb86e654dee6b (diff) | |
| download | lwn-59e99e5b9706867f18d4a36c1e4645fbaacbec2e.tar.gz lwn-59e99e5b9706867f18d4a36c1e4645fbaacbec2e.zip | |
mm: use rlimit helpers
Make sure compiler won't do weird things with limits. E.g. fetching them
twice may return 2 different values after writable limits are implemented.
I.e. either use rlimit helpers added in
3e10e716abf3c71bdb5d86b8f507f9e72236c9cd ("resource: add helpers for
fetching rlimits") or ACCESS_ONCE if not applicable.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/mlock.c')
| -rw-r--r-- | mm/mlock.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/mm/mlock.c b/mm/mlock.c index 2b8335a89400..8f4e2dfceec1 100644 --- a/mm/mlock.c +++ b/mm/mlock.c @@ -25,7 +25,7 @@ int can_do_mlock(void) { if (capable(CAP_IPC_LOCK)) return 1; - if (current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur != 0) + if (rlimit(RLIMIT_MEMLOCK) != 0) return 1; return 0; } @@ -487,7 +487,7 @@ SYSCALL_DEFINE2(mlock, unsigned long, start, size_t, len) locked = len >> PAGE_SHIFT; locked += current->mm->locked_vm; - lock_limit = current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur; + lock_limit = rlimit(RLIMIT_MEMLOCK); lock_limit >>= PAGE_SHIFT; /* check against resource limits */ @@ -550,7 +550,7 @@ SYSCALL_DEFINE1(mlockall, int, flags) down_write(¤t->mm->mmap_sem); - lock_limit = current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur; + lock_limit = rlimit(RLIMIT_MEMLOCK); lock_limit >>= PAGE_SHIFT; ret = -ENOMEM; @@ -584,7 +584,7 @@ int user_shm_lock(size_t size, struct user_struct *user) int allowed = 0; locked = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; - lock_limit = current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur; + lock_limit = rlimit(RLIMIT_MEMLOCK); if (lock_limit == RLIM_INFINITY) allowed = 1; lock_limit >>= PAGE_SHIFT; @@ -618,12 +618,12 @@ int account_locked_memory(struct mm_struct *mm, struct rlimit *rlim, down_write(&mm->mmap_sem); - lim = rlim[RLIMIT_AS].rlim_cur >> PAGE_SHIFT; + lim = ACCESS_ONCE(rlim[RLIMIT_AS].rlim_cur) >> PAGE_SHIFT; vm = mm->total_vm + pgsz; if (lim < vm) goto out; - lim = rlim[RLIMIT_MEMLOCK].rlim_cur >> PAGE_SHIFT; + lim = ACCESS_ONCE(rlim[RLIMIT_MEMLOCK].rlim_cur) >> PAGE_SHIFT; vm = mm->locked_vm + pgsz; if (lim < vm) goto out; |