[S390] cpu shutdown rework

Let one master cpu kill all other cpus instead of sending an external
interrupt to all other cpus so they can kill themselves.
Simplifies reipl/shutdown functions a lot.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/include/asm-s390/smp.h b/include/asm-s390/smp.h
index c3cf030ada4d..7097c96ed026 100644
--- a/include/asm-s390/smp.h
+++ b/include/asm-s390/smp.h
@@ -18,6 +18,7 @@
 
 #include <asm/lowcore.h>
 #include <asm/sigp.h>
+#include <asm/ptrace.h>
 
 /*
   s390 specific smp.c headers
@@ -101,6 +102,13 @@ smp_call_function_on(void (*func) (void *info), void *info,
         func(info);
         return 0;
 }
+
+static inline void smp_send_stop(void)
+{
+        /* Disable all interrupts/machine checks */
+        __load_psw_mask(PSW_KERNEL_BITS & ~PSW_MASK_MCHECK);
+}
+
 #define smp_cpu_not_running(cpu)        1
 #define smp_get_cpu(cpu) ({ 0; })
 #define smp_put_cpu(cpu) ({ 0; })