One of the pagemap_ioctl tests attempts to fault in pages by
memcpy()'ing them to an unused buffer. This probably worked
originally, but since commit 46036188ea1f ("selftests/mm: build with
-O2") the compiler is free to optimise away that unused buffer and
the memcpy() with it. As a result there might not be any resident
page in the mapping and the test may fail.We don't need to copy all that memory anyway. Just fault in every page. Cc: Usama Anjum <[email protected]> Signed-off-by: Kevin Brodsky <[email protected]> --- tools/testing/selftests/mm/pagemap_ioctl.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/tools/testing/selftests/mm/pagemap_ioctl.c b/tools/testing/selftests/mm/pagemap_ioctl.c index 2cb5441f29c7..80d7c391f8f5 100644 --- a/tools/testing/selftests/mm/pagemap_ioctl.c +++ b/tools/testing/selftests/mm/pagemap_ioctl.c @@ -1056,7 +1056,6 @@ int sanity_tests(void) struct page_region *vec; char *mem, *fmem; struct stat sbuf; - char *tmp_buf; /* 1. wrong operation */ mem_size = 10 * page_size; @@ -1167,8 +1166,7 @@ int sanity_tests(void) if (fmem == MAP_FAILED) ksft_exit_fail_msg("error nomem %d %s\n", errno, strerror(errno)); - tmp_buf = malloc(sbuf.st_size); - memcpy(tmp_buf, fmem, sbuf.st_size); + force_read_pages_in_range(fmem, sbuf.st_size); ret = pagemap_ioctl(fmem, sbuf.st_size, vec, vec_size, 0, 0, 0, PAGEMAP_NON_WRITTEN_BITS, 0, PAGEMAP_NON_WRITTEN_BITS); -- 2.51.2
