[PATCH] lockdep: irqtrace subsystem, s390 support
irqtrace support for s390.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/drivers/s390/char/sclp.c b/drivers/s390/char/sclp.c
index 4138564..985d161 100644
--- a/drivers/s390/char/sclp.c
+++ b/drivers/s390/char/sclp.c
@@ -383,6 +383,7 @@
sclp_sync_wait(void)
{
unsigned long psw_mask;
+ unsigned long flags;
unsigned long cr0, cr0_sync;
u64 timeout;
@@ -395,9 +396,11 @@
sclp_tod_from_jiffies(sclp_request_timer.expires -
jiffies);
}
+ local_irq_save(flags);
/* Prevent bottom half from executing once we force interrupts open */
local_bh_disable();
/* Enable service-signal interruption, disable timer interrupts */
+ trace_hardirqs_on();
__ctl_store(cr0, 0, 0);
cr0_sync = cr0;
cr0_sync |= 0x00000200;
@@ -415,11 +418,10 @@
barrier();
cpu_relax();
}
- /* Restore interrupt settings */
- asm volatile ("SSM 0(%0)"
- : : "a" (&psw_mask) : "memory");
+ local_irq_disable();
__ctl_load(cr0, 0, 0);
- __local_bh_enable();
+ _local_bh_enable();
+ local_irq_restore(flags);
}
EXPORT_SYMBOL(sclp_sync_wait);