The patch titled
Subject: selftests/vm: use a common gup_test.h
has been added to the -mm tree. Its filename is
selftests-vm-use-a-common-gup_testh.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/selftests-vm-use-a-common-gup_testh.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/selftests-vm-use-a-common-gup_testh.patch
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------------------------------------------------------
From: John Hubbard <jhubbard@xxxxxxxxxx>
Subject: selftests/vm: use a common gup_test.h
Avoid the need to copy-paste the gup_test ioctl commands and the struct
gup_test definition, between the kernel and the user space application, by
providing a new header file for these. This allows easier and safer
adding of new ioctl calls, as well as reducing the overall line count.
Details: The header file has to be able to compile independently, because
of the arguably unfortunate way that the Makefile is written: the Makefile
tries to build all of its prerequisites, when really it should be only
building the .c files, and leaving the other prerequisites (LOCAL_HDRS) as
pure dependencies.
That Makefile limitation is probably not worth fixing, but it explains why
one of the includes had to be moved into the new header file.
Also: simplify the ioctl struct (struct gup_test), by deleting the unused
__expansion[10] field. This sort of thing is what you might see in a
stable ABI, but this low-level, kernel-developer-oriented selftests/vm
system is very much not subject to ABI stability. So "expansion" and
"reserved" fields are unnecessary here.
Link: https://lkml.kernel.org/r/20200929212747.251804-3-jhubbard@xxxxxxxxxx
Signed-off-by: John Hubbard <jhubbard@xxxxxxxxxx>
Cc: Jérôme Glisse <jglisse@xxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: Ralph Campbell <rcampbell@xxxxxxxxxx>
Cc: Shuah Khan <shuah@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/gup_test.c | 17 +----------------
mm/gup_test.h | 22 ++++++++++++++++++++++
tools/testing/selftests/vm/Makefile | 2 ++
tools/testing/selftests/vm/gup_test.c | 22 +---------------------
4 files changed, 26 insertions(+), 37 deletions(-)
--- a/mm/gup_test.c~selftests-vm-use-a-common-gup_testh
+++ a/mm/gup_test.c
@@ -4,22 +4,7 @@
#include <linux/uaccess.h>
#include <linux/ktime.h>
#include <linux/debugfs.h>
-
-#define GUP_FAST_BENCHMARK _IOWR('g', 1, struct gup_test)
-#define GUP_BENCHMARK _IOWR('g', 2, struct gup_test)
-#define PIN_FAST_BENCHMARK _IOWR('g', 3, struct gup_test)
-#define PIN_BENCHMARK _IOWR('g', 4, struct gup_test)
-#define PIN_LONGTERM_BENCHMARK _IOWR('g', 5, struct gup_test)
-
-struct gup_test {
- __u64 get_delta_usec;
- __u64 put_delta_usec;
- __u64 addr;
- __u64 size;
- __u32 nr_pages_per_call;
- __u32 flags;
- __u64 expansion[10]; /* For future use */
-};
+#include "../../../../mm/gup_test.h"
static void put_back_pages(unsigned int cmd, struct page **pages,
unsigned long nr_pages)
--- /dev/null
+++ a/mm/gup_test.h
@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#ifndef __GUP_TEST_H
+#define __GUP_TEST_H
+
+#include <linux/types.h>
+
+#define GUP_FAST_BENCHMARK _IOWR('g', 1, struct gup_test)
+#define GUP_BENCHMARK _IOWR('g', 2, struct gup_test)
+#define PIN_FAST_BENCHMARK _IOWR('g', 3, struct gup_test)
+#define PIN_BENCHMARK _IOWR('g', 4, struct gup_test)
+#define PIN_LONGTERM_BENCHMARK _IOWR('g', 5, struct gup_test)
+
+struct gup_test {
+ __u64 get_delta_usec;
+ __u64 put_delta_usec;
+ __u64 addr;
+ __u64 size;
+ __u32 nr_pages_per_call;
+ __u32 flags;
+};
+
+#endif /* __GUP_TEST_H */
--- a/tools/testing/selftests/vm/gup_test.c~selftests-vm-use-a-common-gup_testh
+++ a/tools/testing/selftests/vm/gup_test.c
@@ -2,39 +2,19 @@
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
-
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/prctl.h>
#include <sys/stat.h>
#include <sys/types.h>
-
-#include <linux/types.h>
+#include "../../../../mm/gup_test.h"
#define MB (1UL << 20)
#define PAGE_SIZE sysconf(_SC_PAGESIZE)
-#define GUP_FAST_BENCHMARK _IOWR('g', 1, struct gup_test)
-#define GUP_BENCHMARK _IOWR('g', 2, struct gup_test)
-
-/* Similar to above, but use FOLL_PIN instead of FOLL_GET. */
-#define PIN_FAST_BENCHMARK _IOWR('g', 3, struct gup_test)
-#define PIN_BENCHMARK _IOWR('g', 4, struct gup_test)
-#define PIN_LONGTERM_BENCHMARK _IOWR('g', 5, struct gup_test)
-
/* Just the flags we need, copied from mm.h: */
#define FOLL_WRITE 0x01 /* check pte is writable */
-struct gup_test {
- __u64 get_delta_usec;
- __u64 put_delta_usec;
- __u64 addr;
- __u64 size;
- __u32 nr_pages_per_call;
- __u32 flags;
- __u64 expansion[10]; /* For future use */
-};
-
int main(int argc, char **argv)
{
struct gup_test gup;
--- a/tools/testing/selftests/vm/Makefile~selftests-vm-use-a-common-gup_testh
+++ a/tools/testing/selftests/vm/Makefile
@@ -130,3 +130,5 @@ endif
$(OUTPUT)/userfaultfd: LDLIBS += -lpthread
$(OUTPUT)/mlock-random-test: LDLIBS += -lcap
+
+$(OUTPUT)/gup_test: ../../../../mm/gup_test.h
_
Patches currently in -mm which might be from jhubbard@xxxxxxxxxx are
mm-dump_page-rename-head_mapcount-head_compound_mapcount.patch
mm-gup-protect-unpin_user_pages-against-npages==-errno.patch
selftests-vm-fix-false-build-success-on-the-second-and-later-attempts.patch
selftests-vm-fix-incorrect-gcc-invocation-in-some-cases.patch
mm-gup_benchmark-rename-to-mm-gup_test.patch
selftests-vm-use-a-common-gup_testh.patch
selftests-vm-rename-run_vmtests-run_vmtestssh.patch
selftests-vm-minor-cleanup-makefile-and-gup_testc.patch
selftests-vm-only-some-gup_test-items-are-really-benchmarks.patch
selftests-vm-gup_test-introduce-the-dump_pages-sub-test.patch
selftests-vm-run_vmtestsh-update-and-clean-up-gup_test-invocation.patch
selftests-vm-hmm-tests-remove-the-libhugetlbfs-dependency.patch
