From: Alexey Dobriyan adobriyan@gmail.com
[ Upstream commit 5cc81d5c81af0dee54da9a67a3ebe4be076a13db ]
syscall(3) returns -1 and sets errno on error, unlike "syscall" instruction.
Systems which have <= 32/64 CPUs are unaffected. Test won't bounce to all CPUs before completing if there are more of them.
Link: https://lkml.kernel.org/r/Y1bUiT7VRXlXPQa1@p183 Fixes: 1f5bd0547654 ("proc: selftests: test /proc/uptime") Signed-off-by: Alexey Dobriyan adobriyan@gmail.com Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- tools/testing/selftests/proc/proc-uptime-002.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/proc/proc-uptime-002.c b/tools/testing/selftests/proc/proc-uptime-002.c index e7ceabed7f51..7d0aa22bdc12 100644 --- a/tools/testing/selftests/proc/proc-uptime-002.c +++ b/tools/testing/selftests/proc/proc-uptime-002.c @@ -17,6 +17,7 @@ // while shifting across CPUs. #undef NDEBUG #include <assert.h> +#include <errno.h> #include <unistd.h> #include <sys/syscall.h> #include <stdlib.h> @@ -54,7 +55,7 @@ int main(void) len += sizeof(unsigned long); free(m); m = malloc(len); - } while (sys_sched_getaffinity(0, len, m) == -EINVAL); + } while (sys_sched_getaffinity(0, len, m) == -1 && errno == EINVAL);
fd = open("/proc/uptime", O_RDONLY); assert(fd >= 0);