@@ -499,6 +499,9 @@ void *uffd_poll_thread(void *arg)
int ret;
char tmp_chr;
+ if (!args->handle_fault)
+ args->handle_fault = uffd_handle_page_fault;
+
pollfd[0].fd = uffd;
pollfd[0].events = POLLIN;
pollfd[1].fd = pipefd[cpu*2];
@@ -527,7 +530,7 @@ void *uffd_poll_thread(void *arg)
err("unexpected msg event %u\n", msg.event);
break;
case UFFD_EVENT_PAGEFAULT:
- uffd_handle_page_fault(&msg, args);
+ args->handle_fault(&msg, args);
break;
case UFFD_EVENT_FORK:
close(uffd);
@@ -77,6 +77,9 @@ struct uffd_args {
unsigned long missing_faults;
unsigned long wp_faults;
unsigned long minor_faults;
+
+ /* A custom fault handler; defaults to uffd_handle_page_fault. */
+ void (*handle_fault)(struct uffd_msg *msg, struct uffd_args *args);
};
struct uffd_test_ops {
@@ -199,10 +199,8 @@ static int stress(struct uffd_args *args)
locking_thread, (void *)cpu))
return 1;
if (bounces & BOUNCE_POLL) {
- if (pthread_create(&uffd_threads[cpu], &attr,
- uffd_poll_thread,
- (void *)&args[cpu]))
- return 1;
+ if (pthread_create(&uffd_threads[cpu], &attr, uffd_poll_thread, &args[cpu]))
+ err("uffd_poll_thread create");
} else {
if (pthread_create(&uffd_threads[cpu], &attr,
uffd_read_thread,
Previously, we had "one fault handler to rule them all", which used several branches to deal with all of the scenarios required by all of the various tests. In upcoming patches, I plan to add a new test, which has its own slightly different fault handling logic. Instead of continuing to add cruft to the existing fault handler, let's allow tests to define custom ones, separate from other tests. Signed-off-by: Axel Rasmussen <axelrasmussen@google.com> --- tools/testing/selftests/mm/uffd-common.c | 5 ++++- tools/testing/selftests/mm/uffd-common.h | 3 +++ tools/testing/selftests/mm/uffd-stress.c | 6 ++---- 3 files changed, 9 insertions(+), 5 deletions(-)