Commit 160d6d6f authored Oct 24, 2022 by Alexey Dobriyan Committed by Greg Kroah-Hartman Jan 18, 2023

proc: fixup uptime selftest

[ 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: 1f5bd054 ("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>

parent d7b9e43a

tools/testing/selftests/proc/proc-uptime-002.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -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);