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proc: fixup uptime selftest

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[ 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: 1f5bd05476 ("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>
This commit is contained in:
Alexey Dobriyan 2022-10-24 21:08:09 +03:00 committed by Greg Kroah-Hartman
parent d7b9e43a5c
commit 160d6d6f14
1 changed files with 2 additions and 1 deletions
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3
tools/testing/selftests/proc/proc-uptime-002.c
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@ -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);