diff options
author | Peter Xu <peterx@redhat.com> | 2023-04-12 19:42:47 +0300 |
---|---|---|
committer | Andrew Morton <akpm@linux-foundation.org> | 2023-04-19 02:30:05 +0300 |
commit | c4277cb6c8e5dc60d425f3a148b3e2bf40d8d778 (patch) | |
tree | 7cac20f0ad9308cdacaab939d477941845fd5099 /tools/testing/selftests/mm/hugepage-mremap.c | |
parent | 686a8bb723497197022c73807cdd29eb5a1aeec8 (diff) | |
download | linux-c4277cb6c8e5dc60d425f3a148b3e2bf40d8d778.tar.xz |
selftests/mm: uffd_[un]register()
Add two helpers to register/unregister to an uffd. Use them to drop
duplicate codes.
This patch also drops assert_expected_ioctls_present() and
get_expected_ioctls(). Reasons:
- It'll need a lot of effort to pass test_type==HUGETLB into it from
the upper, so it's the simplest way to get rid of another global var
- The ioctls returned in UFFDIO_REGISTER is hardly useful at all,
because any app can already detect kernel support on any ioctl via its
corresponding UFFD_FEATURE_*. The check here is for sanity mostly but
it's probably destined no user app will even use it.
- It's not friendly to one future goal of uffd to run on old
kernels, the problem is get_expected_ioctls() compiles against
UFFD_API_RANGE_IOCTLS, which is a value that can change depending on
where the test is compiled, rather than reflecting what the kernel
underneath has. It means it'll report false negatives on old kernels
so it's against our will.
So let's make our lives easier.
[peterx@redhat.com; tools/testing/selftests/mm/hugepage-mremap.c: add headers]
Link: https://lkml.kernel.org/r/ZDxrvZh/cw357D8P@x1n
Link: https://lkml.kernel.org/r/20230412164247.328293-1-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Axel Rasmussen <axelrasmussen@google.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Dmitry Safonov <0x7f454c46@gmail.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Mike Rapoport (IBM) <rppt@kernel.org>
Cc: Zach O'Keefe <zokeefe@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'tools/testing/selftests/mm/hugepage-mremap.c')
-rw-r--r-- | tools/testing/selftests/mm/hugepage-mremap.c | 9 |
1 files changed, 3 insertions, 6 deletions
diff --git a/tools/testing/selftests/mm/hugepage-mremap.c b/tools/testing/selftests/mm/hugepage-mremap.c index e53b5eaa8fce..cabd0084f57b 100644 --- a/tools/testing/selftests/mm/hugepage-mremap.c +++ b/tools/testing/selftests/mm/hugepage-mremap.c @@ -23,6 +23,8 @@ #include <linux/userfaultfd.h> #include <sys/ioctl.h> #include <string.h> +#include <stdbool.h> +#include "vm_util.h" #define DEFAULT_LENGTH_MB 10UL #define MB_TO_BYTES(x) (x * 1024 * 1024) @@ -60,7 +62,6 @@ static void register_region_with_uffd(char *addr, size_t len) { long uffd; /* userfaultfd file descriptor */ struct uffdio_api uffdio_api; - struct uffdio_register uffdio_register; /* Create and enable userfaultfd object. */ @@ -96,11 +97,7 @@ static void register_region_with_uffd(char *addr, size_t len) * handling by the userfaultfd object. In mode, we request to track * missing pages (i.e., pages that have not yet been faulted in). */ - - uffdio_register.range.start = (unsigned long)addr; - uffdio_register.range.len = len; - uffdio_register.mode = UFFDIO_REGISTER_MODE_MISSING; - if (ioctl(uffd, UFFDIO_REGISTER, &uffdio_register) == -1) { + if (uffd_register(uffd, addr, len, true, false, false)) { perror("ioctl-UFFDIO_REGISTER"); exit(1); } |