s390/hypfs: use basic block for diag inline assembly

Use only simple inline assemblies which consist of a single basic
block if the register asm construct is being used.

Otherwise gcc would generate broken code if the compiler option
--sanitize-coverage=trace-pc would be used.

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

diff --git a/arch/s390/hypfs/hypfs_diag.c b/arch/s390/hypfs/hypfs_diag.c
index 27779f0..67d43a0 100644 (file)
--- a/arch/s390/hypfs/hypfs_diag.c
+++ b/arch/s390/hypfs/hypfs_diag.c
@@ -337,9 +337,9 @@ static inline __u64 phys_cpu__ctidx(enum diag204_format type, void *hdr)
 
 /* Diagnose 204 functions */
 
-static inline int __diag204(unsigned long subcode, unsigned long size, void *addr)
+static inline int __diag204(unsigned long *subcode, unsigned long size, void *addr)
 {
-       register unsigned long _subcode asm("0") = subcode;
+       register unsigned long _subcode asm("0") = *subcode;
        register unsigned long _size asm("1") = size;
 
        asm volatile(
@@ -347,15 +347,17 @@ static inline int __diag204(unsigned long subcode, unsigned long size, void *add
                "0:     nopr    %%r7\n"
                EX_TABLE(0b,0b)
                : "+d" (_subcode), "+d" (_size) : "d" (addr) : "memory");
-       if (_subcode)
-               return -1;
+       *subcode = _subcode;
        return _size;
 }
 
 static int diag204(unsigned long subcode, unsigned long size, void *addr)
 {
        diag_stat_inc(DIAG_STAT_X204);
-       return __diag204(subcode, size, addr);
+       size = __diag204(&subcode, size, addr);
+       if (subcode)
+               return -1;
+       return size;
 }
 
 /*