[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>

1 files changed, 6 insertions, 4 deletions

diff --git a/drivers/s390/char/sclp.c b/drivers/s390/char/sclp.c
index 4138564402b8..985d1613baaa 100644
--- a/drivers/s390/char/sclp.c
+++ b/drivers/s390/char/sclp.c
@@ -383,6 +383,7 @@ void
 sclp_sync_wait(void)
 {
         unsigned long psw_mask;
+        unsigned long flags;
         unsigned long cr0, cr0_sync;
         u64 timeout;
 
@@ -395,9 +396,11 @@ sclp_sync_wait(void)
                           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 @@ sclp_sync_wait(void)
                 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);