diff options
| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2012-05-10 09:44:35 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2012-05-16 14:42:42 +0200 |
| commit | 54c27791227756b37504bd35b9ad0a40d1ae4c4b (patch) | |
| tree | 0bc3deade66273cac996297166c9c82a5a23b392 /arch/s390/mm/fault.c | |
| parent | d5e50a51ccbda36b379aba9d1131a852eb908dda (diff) | |
| download | op-kernel-dev-54c27791227756b37504bd35b9ad0a40d1ae4c4b.zip op-kernel-dev-54c27791227756b37504bd35b9ad0a40d1ae4c4b.tar.gz | |
s390/pfault: always search for task with reported pid
Make the code a bit more symmetric and always search for the task of the
reported pid. This simplifies the code a bit.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/mm/fault.c')
| -rw-r--r-- | arch/s390/mm/fault.c | 24 |
1 files changed, 10 insertions, 14 deletions
diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c index 67e2d4d..4306f5e 100644 --- a/arch/s390/mm/fault.c +++ b/arch/s390/mm/fault.c @@ -549,19 +549,15 @@ static void pfault_interrupt(struct ext_code ext_code, if ((subcode & 0xff00) != __SUBCODE_MASK) return; kstat_cpu(smp_processor_id()).irqs[EXTINT_PFL]++; - if (subcode & 0x0080) { - /* Get the token (= pid of the affected task). */ - pid = sizeof(void *) == 4 ? param32 : param64; - rcu_read_lock(); - tsk = find_task_by_pid_ns(pid, &init_pid_ns); - if (tsk) - get_task_struct(tsk); - rcu_read_unlock(); - if (!tsk) - return; - } else { - tsk = current; - } + /* Get the token (= pid of the affected task). */ + pid = sizeof(void *) == 4 ? param32 : param64; + rcu_read_lock(); + tsk = find_task_by_pid_ns(pid, &init_pid_ns); + if (tsk) + get_task_struct(tsk); + rcu_read_unlock(); + if (!tsk) + return; spin_lock(&pfault_lock); if (subcode & 0x0080) { /* signal bit is set -> a page has been swapped in by VM */ @@ -586,7 +582,6 @@ static void pfault_interrupt(struct ext_code ext_code, if (tsk->state == TASK_RUNNING) tsk->thread.pfault_wait = -1; } - put_task_struct(tsk); } else { /* signal bit not set -> a real page is missing. */ if (tsk->thread.pfault_wait == 1) { @@ -612,6 +607,7 @@ static void pfault_interrupt(struct ext_code ext_code, } } spin_unlock(&pfault_lock); + put_task_struct(tsk); } static int __cpuinit pfault_cpu_notify(struct notifier_block *self, |
