[S390] cleanup lowcore access from external interrupts

Read external interrupts parameters from the lowcore in the first
level interrupt handler in entry[64].S.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 8 insertions, 3 deletions

diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index b6570069b127..b4aad0c1f562 100644
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -542,7 +542,8 @@ void pfault_fini(void)
                 : : "a" (&refbk), "m" (refbk) : "cc");
 }
 
-static void pfault_interrupt(__u16 int_code)
+static void pfault_interrupt(unsigned int ext_int_code,
+                             unsigned int param32, unsigned long param64)
 {
         struct task_struct *tsk;
         __u16 subcode;
@@ -553,14 +554,18 @@ static void pfault_interrupt(__u16 int_code)
          * in the 'cpu address' field associated with the
          * external interrupt. 
          */
-        subcode = S390_lowcore.cpu_addr;
+        subcode = ext_int_code >> 16;
         if ((subcode & 0xff00) != __SUBCODE_MASK)
                 return;
 
         /*
          * Get the token (= address of the task structure of the affected task).
          */
-        tsk = *(struct task_struct **) __LC_PFAULT_INTPARM;
+#ifdef CONFIG_64BIT
+        tsk = *(struct task_struct **) param64;
+#else
+        tsk = *(struct task_struct **) param32;
+#endif
 
         if (subcode & 0x0080) {
                 /* signal bit is set -> a page has been swapped in by VM */