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| author | Joel Savitz <jsavitz@redhat.com> | 2022-05-10 03:20:47 +0200 |
|---|---|---|
| committer | akpm <akpm@linux-foundation.org> | 2022-05-10 03:20:47 +0200 |
| commit | 17de1e559cf1eb01d5d90afd3064d5a280060f6f (patch) | |
| tree | d1122be16c6498580b9b80448a2b84583c27b727 /tools | |
| parent | mm/gup: fix comments to pin_user_pages_*() (diff) | |
| download | linux-17de1e559cf1eb01d5d90afd3064d5a280060f6f.tar.xz linux-17de1e559cf1eb01d5d90afd3064d5a280060f6f.zip | |
selftests: clarify common error when running gup_test
The gup_test binary will fail showing only the output of perror("open") in
the case that /sys/kernel/debug/gup_test is not found. This will almost
always be due to CONFIG_GUP_TEST not being set, which enables
compilation of a kernel that provides this file.
Add a short error message to clarify this failure and point the user to
the solution.
Link: https://lkml.kernel.org/r/20220502224942.995427-1-jsavitz@redhat.com
Signed-off-by: Joel Savitz <jsavitz@redhat.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Nico Pache <npache@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/testing/selftests/vm/gup_test.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/tools/testing/selftests/vm/gup_test.c b/tools/testing/selftests/vm/gup_test.c index 593262555e18..6bb36ca71cb5 100644 --- a/tools/testing/selftests/vm/gup_test.c +++ b/tools/testing/selftests/vm/gup_test.c @@ -21,6 +21,8 @@ #define FOLL_WRITE 0x01 /* check pte is writable */ #define FOLL_TOUCH 0x02 /* mark page accessed */ +#define GUP_TEST_FILE "/sys/kernel/debug/gup_test" + static unsigned long cmd = GUP_FAST_BENCHMARK; static int gup_fd, repeats = 1; static unsigned long size = 128 * MB; |