[S390] pfault: cpu hotplug vs missing completion interrupts

On cpu hot remove a PFAULT CANCEL command is sent to the hypervisor
which in turn will cancel all outstanding pfault requests that have
been issued on that cpu (the same happens with a SIGP cpu reset).

The result is that we end up with uninterruptible processes where
the interrupt that would wake up these processes never arrives.

In order to solve this all processes which wait for a pfault
completion interrupt get woken up after a cpu hot remove. The worst
case that could happen is that they fault again and in turn need to
wait again.

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

2 files changed, 3 insertions, 2 deletions

diff --git a/arch/s390/include/asm/lowcore.h b/arch/s390/include/asm/lowcore.h
index b8624d53c379..228cf0b295db 100644
--- a/arch/s390/include/asm/lowcore.h
+++ b/arch/s390/include/asm/lowcore.h
@@ -124,7 +124,7 @@ struct _lowcore {
         /* Address space pointer. */
         __u32   kernel_asce;                    /* 0x02ac */
         __u32   user_asce;                      /* 0x02b0 */
-        __u8    pad_0x02b4[0x02b8-0x02b4];      /* 0x02b4 */
+        __u32   current_pid;                    /* 0x02b4 */
 
         /* SMP info area */
         __u32   cpu_nr;                         /* 0x02b8 */
@@ -255,7 +255,7 @@ struct _lowcore {
         /* Address space pointer. */
         __u64   kernel_asce;                    /* 0x0310 */
         __u64   user_asce;                      /* 0x0318 */
-        __u8    pad_0x0320[0x0328-0x0320];      /* 0x0320 */
+        __u64   current_pid;                    /* 0x0320 */
 
         /* SMP info area */
         __u32   cpu_nr;                         /* 0x0328 */
diff --git a/arch/s390/include/asm/processor.h b/arch/s390/include/asm/processor.h
index 2c79b6416271..1300c3025334 100644
--- a/arch/s390/include/asm/processor.h
+++ b/arch/s390/include/asm/processor.h
@@ -84,6 +84,7 @@ struct thread_struct {
         struct per_event per_event;     /* Cause of the last PER trap */
         /* pfault_wait is used to block the process on a pfault event */
         unsigned long pfault_wait;
+        struct list_head list;
 };
 
 typedef struct thread_struct thread_struct;