From: Alexey Dobriyan <adobriyan@xxxxxxxxx> Subject: proc: more robust bulk read test /proc may not be mounted and test will exit successfully. Ensure proc is mounted at /proc. Link: http://lkml.kernel.org/r/20190209105613.GA10384@avx2 Signed-off-by: Alexey Dobriyan <adobriyan@xxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- tools/testing/selftests/proc/read.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) --- a/tools/testing/selftests/proc/read.c~proc-more-robust-bulk-read-test +++ a/tools/testing/selftests/proc/read.c @@ -26,8 +26,10 @@ #include <dirent.h> #include <stdbool.h> #include <stdlib.h> +#include <stdio.h> #include <string.h> #include <sys/stat.h> +#include <sys/vfs.h> #include <fcntl.h> #include <unistd.h> @@ -123,10 +125,22 @@ static void f(DIR *d, unsigned int level int main(void) { DIR *d; + struct statfs sfs; d = opendir("/proc"); if (!d) return 4; + + /* Ensure /proc is proc. */ + if (fstatfs(dirfd(d), &sfs) == -1) { + return 1; + } + if (sfs.f_type != 0x9fa0) { + fprintf(stderr, "error: unexpected f_type %lx\n", (long)sfs.f_type); + return 2; + } + f(d, 0); + return 0; } _
