[PATCH kvm-unit-tests 1/2] s390x: diag288: Add missing clobber

Nico Boehr
2021-12-17T10:32:28Z

We clobber r0 and thus should let the compiler know we're doing so.

Because we change from basic to extended ASM, we need to change the
register names, as %r0 will be interpreted as a token in the assembler
template.

For consistency, we align with the common style in kvm-unit-tests which
is just 0.

Signed-off-by: Nico Boehr <nrb@linux.ibm.com>
---
s390x/diag288.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/s390x/diag288.c b/s390x/diag288.c
index 072c04a5cbd6..da7b06c365bf 100644
--- a/s390x/diag288.c
+++ b/s390x/diag288.c
@@ -94,11 +94,12 @@ static void test_bite(void)
/* Arm watchdog */
lc->restart_new_psw.mask = extract_psw_mask() & ~PSW_MASK_EXT;
diag288(CODE_INIT, 15, ACTION_RESTART);
- asm volatile(" larl %r0, 1f\n"
- " stg %r0, 424\n"
+ asm volatile(" larl 0, 1f\n"
+ " stg 0, 424\n"
"0: nop\n"
" j 0b\n"
- "1:");
+ "1:"
+ : : : "0");
report_pass("restart");
}

--
2.31.1