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authorAnton Arapov <anton@redhat.com>2012-08-07 11:21:50 +0200
committerAnton Arapov <anton@redhat.com>2012-08-07 12:52:25 +0200
commit1d44b6f3fcf6058fb7c960b7558766967e8028f7 (patch)
tree53d88547c973ba048d233091a3f91f3173ad01df /arch/s390/mm/fault.c
parentd91eda5d7b0383e6a0c83e0146ff141ff3b1355b (diff)
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fedora kernel: 222b075b3ff0d9e88aa9353e3c80667756ed7361v3.5.0-4
Signed-off-by: Anton Arapov <anton@redhat.com>
Diffstat (limited to 'arch/s390/mm/fault.c')
-rw-r--r--arch/s390/mm/fault.c33
1 files changed, 16 insertions, 17 deletions
diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index 4e66860029f..72cec9ecd96 100644
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -294,7 +294,7 @@ static inline int do_exception(struct pt_regs *regs, int access)
down_read(&mm->mmap_sem);
#ifdef CONFIG_PGSTE
- if (test_tsk_thread_flag(current, TIF_SIE) && S390_lowcore.gmap) {
+ if ((current->flags & PF_VCPU) && S390_lowcore.gmap) {
address = __gmap_fault(address,
(struct gmap *) S390_lowcore.gmap);
if (address == -EFAULT) {
@@ -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 */
@@ -586,12 +582,13 @@ 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 (WARN_ON_ONCE(tsk != current))
+ goto out;
if (tsk->thread.pfault_wait == 1) {
/* Already on the list with a reference: put to sleep */
- set_task_state(tsk, TASK_UNINTERRUPTIBLE);
+ __set_task_state(tsk, TASK_UNINTERRUPTIBLE);
set_tsk_need_resched(tsk);
} else if (tsk->thread.pfault_wait == -1) {
/* Completion interrupt was faster than the initial
@@ -607,11 +604,13 @@ static void pfault_interrupt(struct ext_code ext_code,
get_task_struct(tsk);
tsk->thread.pfault_wait = 1;
list_add(&tsk->thread.list, &pfault_list);
- set_task_state(tsk, TASK_UNINTERRUPTIBLE);
+ __set_task_state(tsk, TASK_UNINTERRUPTIBLE);
set_tsk_need_resched(tsk);
}
}
+out:
spin_unlock(&pfault_lock);
+ put_task_struct(tsk);
}
static int __cpuinit pfault_cpu_notify(struct notifier_block *self,