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dkim=pass header.d=oracle.com header.s=corp-2021-07-09 header.b=lfYkgxs+; dkim=pass header.d=oracle.onmicrosoft.com header.s=selector2-oracle-onmicrosoft-com header.b=O+dkGK6B; dmarc=pass (policy=none) header.from=oracle.com; spf=none (imf26.hostedemail.com: domain of sidhartha.kumar@oracle.com has no SPF policy when checking 205.220.165.32) smtp.mailfrom=sidhartha.kumar@oracle.com X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: F0E5A140009 X-HE-Tag: 1648677201-639303 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000063, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Print two possible reasons /sys/kernel/debug/gup_test cannot be opened to help users of this test diagnose failures. Signed-off-by: Sidhartha Kumar Cc: stable@vger.kernel.org # 5.15+ --- tools/testing/selftests/vm/gup_test.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/vm/gup_test.c b/tools/testing/selftests/vm/gup_test.c index fe043f67798b0..c496bcefa7a0e 100644 --- a/tools/testing/selftests/vm/gup_test.c +++ b/tools/testing/selftests/vm/gup_test.c @@ -205,7 +205,9 @@ int main(int argc, char **argv) gup_fd = open("/sys/kernel/debug/gup_test", O_RDWR); if (gup_fd == -1) { - perror("open"); + perror("failed to open /sys/kernel/debug/gup_test"); + printf("check if CONFIG_GUP_TEST is enabled in kernel config\n"); + printf("check if debugfs is mounted at /sys/kernel/debug\n"); exit(1); }