From: Janosch Frank <frankja@xxxxxxxxxxxxx> Dirtying the CC allows us to find missing CC changes. Signed-off-by: Janosch Frank <frankja@xxxxxxxxxxxxx> Reviewed-by: Claudio Imbrenda <imbrenda@xxxxxxxxxxxxx> Link: https://lore.kernel.org/r/20240131074427.70871-3-frankja@xxxxxxxxxxxxx Signed-off-by: Nico Boehr <nrb@xxxxxxxxxxxxx> --- lib/s390x/asm/uv.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/lib/s390x/asm/uv.h b/lib/s390x/asm/uv.h index e9fb19af..611dcd3f 100644 --- a/lib/s390x/asm/uv.h +++ b/lib/s390x/asm/uv.h @@ -216,14 +216,16 @@ struct uv_cb_ssc { 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) -- 2.44.0
