s390/pci: cleanup clp inline assembly

Tell gcc that the memory region pointed to by req will be used (and
changed). Also remove the (now) superfluous memory constraint.

Acked-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 6 insertions, 5 deletions

diff --git a/arch/s390/pci/pci_clp.c b/arch/s390/pci/pci_clp.c
index 2c847143cbd1..702bd2693689 100644
--- a/arch/s390/pci/pci_clp.c
+++ b/arch/s390/pci/pci_clp.c
@@ -19,18 +19,19 @@
  * Call Logical Processor
  * Retry logic is handled by the caller.
  */
-static inline u8 clp_instr(void *req)
+static inline u8 clp_instr(void *data)
 {
-        u64 ilpm;
+        struct { u8 _[CLP_BLK_SIZE]; } *req = data;
+        u64 ignored;
         u8 cc;
 
         asm volatile (
-                "       .insn   rrf,0xb9a00000,%[ilpm],%[req],0x0,0x2\n"
+                "       .insn   rrf,0xb9a00000,%[ign],%[req],0x0,0x2\n"
                 "       ipm     %[cc]\n"
                 "       srl     %[cc],28\n"
-                : [cc] "=d" (cc), [ilpm] "=d" (ilpm)
+                : [cc] "=d" (cc), [ign] "=d" (ignored), "+m" (*req)
                 : [req] "a" (req)
-                : "cc", "memory");
+                : "cc");
         return cc;
 }