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authorJohn Hubbard <jhubbard@nvidia.com>2020-12-14 19:05:08 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2020-12-15 12:13:38 -0800
commitb9dcfdff8b4b223280015281b5050976c484c80a (patch)
tree4eb44235b69ec2f2d8cea44353df68aac3b691e3 /mm/gup_test.c
parent9c84f229268fa229e250b7225611d0eb7094fea0 (diff)
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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/20201026064021.3545418-3-jhubbard@nvidia.com Signed-off-by: John Hubbard <jhubbard@nvidia.com> Cc: Jérôme Glisse <jglisse@redhat.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Ralph Campbell <rcampbell@nvidia.com> Cc: Shuah Khan <shuah@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/gup_test.c')
-rw-r--r--mm/gup_test.c17
1 files changed, 1 insertions, 16 deletions
diff --git a/mm/gup_test.c b/mm/gup_test.c
index 59472ea6aa39..4c2d70d88f24 100644
--- a/mm/gup_test.c
+++ b/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 "gup_test.h"
static void put_back_pages(unsigned int cmd, struct page **pages,
unsigned long nr_pages)