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selftests: clarify common error when running gup_test

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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>
This commit is contained in:
Joel Savitz 2022-05-09 18:20:47 -07:00 committed by akpm
parent 0768c8de1b
commit 17de1e559c
1 changed files with 2 additions and 0 deletions
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2
tools/testing/selftests/vm/gup_test.c
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@ -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;