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| author | Oleg Nesterov <oleg@tv-sign.ru> | 2006-08-29 09:17:41 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@nelson.home.kernel.dk> | 2006-09-30 20:31:18 +0200 |
| commit | cf342e52e3117391868fb4bd900ce772a27a5a1a (patch) | |
| tree | 4e9d48d0680bfd8dc90de645c891a6fa47931fdd /fs | |
| parent | 25034d7a83cf77667f3d65822484b305d4be6b25 (diff) | |
| download | lwn-cf342e52e3117391868fb4bd900ce772a27a5a1a.tar.gz lwn-cf342e52e3117391868fb4bd900ce772a27a5a1a.zip | |
[PATCH] Don't need to disable interrupts for tasklist_lock
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/ioprio.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/fs/ioprio.c b/fs/ioprio.c index 0fd1089d7bf6..03dc4f269b76 100644 --- a/fs/ioprio.c +++ b/fs/ioprio.c @@ -81,7 +81,12 @@ asmlinkage long sys_ioprio_set(int which, int who, int ioprio) } ret = -ESRCH; - read_lock_irq(&tasklist_lock); + /* + * We want IOPRIO_WHO_PGRP/IOPRIO_WHO_USER to be "atomic", + * so we can't use rcu_read_lock(). See re-copy of ->ioprio + * in copy_process(). + */ + read_lock(&tasklist_lock); switch (which) { case IOPRIO_WHO_PROCESS: if (!who) @@ -124,7 +129,7 @@ free_uid: ret = -EINVAL; } - read_unlock_irq(&tasklist_lock); + read_unlock(&tasklist_lock); return ret; } @@ -170,7 +175,7 @@ asmlinkage long sys_ioprio_get(int which, int who) int ret = -ESRCH; int tmpio; - read_lock_irq(&tasklist_lock); + read_lock(&tasklist_lock); switch (which) { case IOPRIO_WHO_PROCESS: if (!who) @@ -221,7 +226,7 @@ asmlinkage long sys_ioprio_get(int which, int who) ret = -EINVAL; } - read_unlock_irq(&tasklist_lock); + read_unlock(&tasklist_lock); return ret; } |