| Message ID | 20220819232706.2009052-1-edliaw@google.com |
|---|---|
| State | Accepted |
| Headers | show |
| Series | [v3] syscalls/signal06: loop being clobbered by syscall on clang | expand |
Hi! Applied, thanks.
diff --git a/testcases/kernel/syscalls/signal/signal06.c b/testcases/kernel/syscalls/signal/signal06.c index 64f886ee3..cf0706ea4 100644 --- a/testcases/kernel/syscalls/signal/signal06.c +++ b/testcases/kernel/syscalls/signal/signal06.c @@ -72,8 +72,8 @@ void test(void) while (D == VALUE && loop < LOOPS) { /* sys_tkill(pid, SIGHUP); asm to avoid save/reload * fp regs around c call */ - asm ("" : : "a"(__NR_tkill), "D"(pid), "S"(SIGHUP)); - asm ("syscall" : : : "ax"); + int unused; + asm volatile ("syscall" : "=a"(unused) : "a"(__NR_tkill), "D"(pid), "S"(SIGHUP) : "rcx", "r11"); loop++; }
Indicate to the compiler that the syscall will modify registers rcx and r11 to prevent loop from getting clobbered. Signed-off-by: Edward Liaw <edliaw@google.com> --- I added an output operand for the result so that the compiler would know that rax is clobbered as well. --- testcases/kernel/syscalls/signal/signal06.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)