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authorMike Rapoport <rppt@linux.vnet.ibm.com>2017-02-25 01:56:02 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2017-02-25 04:46:54 +0300
commitd811914d87576c562e849c00d9f9beff45038801 (patch)
tree7f31dbf8e5febb2396b7428d3c821792e5ce9787 /tools
parent0262d9c845ec349edf93f69688a5129c36cc2232 (diff)
downloadlinux-d811914d87576c562e849c00d9f9beff45038801.tar.xz
userfaultfd: non-cooperative: rename *EVENT_MADVDONTNEED to *EVENT_REMOVE
Patch series "userfaultfd: non-cooperative: add madvise() event for MADV_REMOVE request". These patches add notification of madvise(MADV_REMOVE) event to non-cooperative userfaultfd monitor. The first pacth renames EVENT_MADVDONTNEED to EVENT_REMOVE along with relevant functions and structures. Using _REMOVE instead of _MADVDONTNEED describes the event semantics more clearly and I hope it's not too late for such change in the ABI. This patch (of 3): The UFFD_EVENT_MADVDONTNEED purpose is to notify uffd monitor about removal of certain range from address space tracked by userfaultfd. Hence, UFFD_EVENT_REMOVE seems to better reflect the operation semantics. Respectively, 'madv_dn' field of uffd_msg is renamed to 'remove' and the madvise_userfault_dontneed callback is renamed to userfaultfd_remove. Link: http://lkml.kernel.org/r/1484814154-1557-2-git-send-email-rppt@linux.vnet.ibm.com Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com> Reviewed-by: Andrea Arcangeli <aarcange@redhat.com> Acked-by: Hillf Danton <hillf.zj@alibaba-inc.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'tools')
-rw-r--r--tools/testing/selftests/vm/userfaultfd.c16
1 files changed, 8 insertions, 8 deletions
diff --git a/tools/testing/selftests/vm/userfaultfd.c b/tools/testing/selftests/vm/userfaultfd.c
index 5a840a605a16..9eb77df568f7 100644
--- a/tools/testing/selftests/vm/userfaultfd.c
+++ b/tools/testing/selftests/vm/userfaultfd.c
@@ -398,12 +398,12 @@ static void *uffd_poll_thread(void *arg)
uffd = msg.arg.fork.ufd;
pollfd[0].fd = uffd;
break;
- case UFFD_EVENT_MADVDONTNEED:
- uffd_reg.range.start = msg.arg.madv_dn.start;
- uffd_reg.range.len = msg.arg.madv_dn.end -
- msg.arg.madv_dn.start;
+ case UFFD_EVENT_REMOVE:
+ uffd_reg.range.start = msg.arg.remove.start;
+ uffd_reg.range.len = msg.arg.remove.end -
+ msg.arg.remove.start;
if (ioctl(uffd, UFFDIO_UNREGISTER, &uffd_reg.range))
- fprintf(stderr, "madv_dn failure\n"), exit(1);
+ fprintf(stderr, "remove failure\n"), exit(1);
break;
case UFFD_EVENT_REMAP:
area_dst = (char *)(unsigned long)msg.arg.remap.to;
@@ -570,7 +570,7 @@ static int userfaultfd_open(int features)
* mremap, the entire monitored area is accessed in a single pass for
* HUGETLB_TEST.
* The release of the pages currently generates event only for
- * anonymous memory (UFFD_EVENT_MADVDONTNEED), hence it is not checked
+ * anonymous memory (UFFD_EVENT_REMOVE), hence it is not checked
* for hugetlb and shmem.
*/
static int faulting_process(void)
@@ -715,14 +715,14 @@ static int userfaultfd_events_test(void)
pid_t pid;
char c;
- printf("testing events (fork, remap, madv_dn): ");
+ printf("testing events (fork, remap, remove): ");
fflush(stdout);
if (release_pages(area_dst))
return 1;
features = UFFD_FEATURE_EVENT_FORK | UFFD_FEATURE_EVENT_REMAP |
- UFFD_FEATURE_EVENT_MADVDONTNEED;
+ UFFD_FEATURE_EVENT_REMOVE;
if (userfaultfd_open(features) < 0)
return 1;
fcntl(uffd, F_SETFL, uffd_flags | O_NONBLOCK);