From: Christian Ehrhardt <ehrhardt@xxxxxxxxxxxxxxxxxx>
When trying to run rate limited fio runs we encountered that the current
definition of a nop uses a privileged instruction which is not even a nop,
but a yield call to the hipervisor.
That leads to a SIGILL as it is privileged.
To solve that issue replace it with a nop, the assembler will take care
of it (likely to become a BCR 0,0)
Signed-off-by: Christian Ehrhardt <ehrhardt@xxxxxxxxxxxxxxxxxx>
---
[diffstat]
arch/arch-s390.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
[diff]
--- a/arch/arch-s390.h
+++ b/arch/arch-s390.h
@@ -18,7 +18,7 @@
#define __NR_sys_vmsplice 309
#endif
-#define nop asm volatile ("diag 0,0,68" : : : "memory")
+#define nop asm volatile("nop" : : : "memory")
#define read_barrier() asm volatile("bcr 15,0" : : : "memory")
#define write_barrier() asm volatile("bcr 15,0" : : : "memory")
--
To unsubscribe from this list: send the line "unsubscribe fio" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
