The patch titled
Subject: selftests: clarify common error when running gup_test
has been added to the -mm mm-unstable branch. Its filename is
selftests-clarify-common-error-when-running-gup_test.patch
This patch should soon appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Joel Savitz <jsavitz@xxxxxxxxxx>
Subject: 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@xxxxxxxxxx
Signed-off-by: Joel Savitz <jsavitz@xxxxxxxxxx>
Cc: Shuah Khan <shuah@xxxxxxxxxx>
Cc: Nico Pache <npache@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
tools/testing/selftests/vm/gup_test.c | 2 ++
1 file changed, 2 insertions(+)
--- a/tools/testing/selftests/vm/gup_test.c~selftests-clarify-common-error-when-running-gup_test
+++ a/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;
_
Patches currently in -mm which might be from jsavitz@xxxxxxxxxx are
selftests-vm-makefile-rename-targets-to-vmtargets.patch
selftests-clarify-common-error-when-running-gup_test.patch
