lib: s390x: uv: Dirty CC before uvc execution
Dirtying the CC allows us to find missing CC changes.
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Link: https://lore.kernel.org/r/20240131074427.70871-3-frankja@linux.ibm.com
Signed-off-by: Nico Boehr <nrb@linux.ibm.com>
diff --git a/lib/s390x/asm/uv.h b/lib/s390x/asm/uv.h
index e9fb19a..611dcd3 100644
--- a/lib/s390x/asm/uv.h
+++ b/lib/s390x/asm/uv.h
@@ -216,14 +216,16 @@
static inline int uv_call_once(unsigned long r1, unsigned long r2)
{
+ uint64_t bogus_cc = 1;
int cc;
asm volatile(
+ " tmll %[bogus_cc],3\n"
"0: .insn rrf,0xB9A40000,%[r1],%[r2],0,0\n"
" ipm %[cc]\n"
" srl %[cc],28\n"
: [cc] "=d" (cc)
- : [r1] "a" (r1), [r2] "a" (r2)
+ : [r1] "a" (r1), [r2] "a" (r2), [bogus_cc] "d" (bogus_cc)
: "memory", "cc");
if (UVC_ERR_DEBUG && cc == 1)
