From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F3DB3357A3C for ; Wed, 7 Jan 2026 17:21:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767806505; cv=none; b=AqbMxuSPp1EJxubSvAPaXaq2l5T0nY3MlPqKxq6ccuh3xQOxgZuD4A7Rvp4swPASb0YfTUnUFK8TilwvElG7T2mhRHxyY6taZE6HbieSptWmvc+1VlVrNF/DdnrOQNRScU+1MylMestiF1pHDL/w3KFUqcFkgggokckPNlqyAbc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767806505; c=relaxed/simple; bh=qTDAdnRkbadUy3Y0gT08CzXCCpx2I/31E2un6Lo+Ijs=; h=Date:To:From:Subject:Message-Id; b=sDNdDtzu4GeU1Cpy5CDL1OZ2PDZ8YCN3cxnJ2AceWrNhSoIE+zC5NTahQYOc1+zMOpH2qqMcpwsfGn94CapXJ8Ha4BY36B286MFpdl1JKyhz5MewaCsN8YMZ/c8bANhUfWqrv5ho2r8NQNeiaDkxon97EUTUkCYriTlVMw4dg5k= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=jI8+vDeT; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="jI8+vDeT" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 06729C4CEF1; Wed, 7 Jan 2026 17:21:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1767806504; bh=qTDAdnRkbadUy3Y0gT08CzXCCpx2I/31E2un6Lo+Ijs=; h=Date:To:From:Subject:From; b=jI8+vDeTOaeuO63H9NG1K+GC6a4g6Bt6MnIiVsJghhNn3TQzBW1hXfu+Bb1kEAYNG UDb7TI7fzT+Cg8s64l+0hlcCNX/W66ToqfkDfg+mL9NR+fRDtr5kmK37XqpzAqMPG9 fmaQcEAyHPlBJWrLVCADdHNGqljIrlCakuT1iF+k= Date: Wed, 07 Jan 2026 09:21:43 -0800 To: mm-commits@vger.kernel.org,vbabka@suse.cz,Usama.Anjum@arm.com,surenb@google.com,shuah@kernel.org,ryan.roberts@arm.com,rppt@kernel.org,pabeni@redhat.com,mhocko@suse.com,lorenzo.stoakes@oracle.com,linyunsheng@huawei.com,Liam.Howlett@oracle.com,jhubbard@nvidia.com,jgg@nvidia.com,david@kernel.org,broonie@kernel.org,kevin.brodsky@arm.com,akpm@linux-foundation.org From: Andrew Morton Subject: + selftests-mm-fix-faulting-in-code-in-pagemap_ioctl-test.patch added to mm-new branch Message-Id: <20260107172144.06729C4CEF1@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: selftests/mm: fix faulting-in code in pagemap_ioctl test has been added to the -mm mm-new branch. Its filename is selftests-mm-fix-faulting-in-code-in-pagemap_ioctl-test.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-mm-fix-faulting-in-code-in-pagemap_ioctl-test.patch This patch will later appear in the mm-new branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Note, mm-new is a provisional staging ground for work-in-progress patches, and acceptance into mm-new is a notification for others take notice and to finish up reviews. Please do not hesitate to respond to review feedback and post updated versions to replace or incrementally fixup patches in mm-new. The mm-new branch of mm.git is not included in linux-next Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via various branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there most days ------------------------------------------------------ From: Kevin Brodsky Subject: selftests/mm: fix faulting-in code in pagemap_ioctl test Date: Wed, 7 Jan 2026 16:48:40 +0000 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. Link: https://lkml.kernel.org/r/20260107164842.3289559-7-kevin.brodsky@arm.com Signed-off-by: Kevin Brodsky Cc: Usama Anjum Cc: David Hildenbrand Cc: Jason Gunthorpe Cc: John Hubbard Cc: "Liam R. Howlett" Cc: Lorenzo Stoakes Cc: Mark Brown Cc: Michal Hocko Cc: Mike Rapoport Cc: Paolo Abeni Cc: Ryan Roberts Cc: Shuah Khan Cc: Suren Baghdasaryan Cc: Vlastimil Babka Cc: Yunsheng Lin Signed-off-by: Andrew Morton --- tools/testing/selftests/mm/pagemap_ioctl.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) --- a/tools/testing/selftests/mm/pagemap_ioctl.c~selftests-mm-fix-faulting-in-code-in-pagemap_ioctl-test +++ a/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); _ Patches currently in -mm which might be from kevin.brodsky@arm.com are x86-xen-simplify-flush_lazy_mmu.patch powerpc-mm-implement-arch_flush_lazy_mmu_mode.patch sparc-mm-implement-arch_flush_lazy_mmu_mode.patch mm-clarify-lazy_mmu-sleeping-constraints.patch mm-introduce-config_arch_has_lazy_mmu_mode.patch mm-introduce-generic-lazy_mmu-helpers.patch mm-bail-out-of-lazy_mmu_mode_-in-interrupt-context.patch mm-enable-lazy_mmu-sections-to-nest.patch arm64-mm-replace-tif_lazy_mmu-with-is_lazy_mmu_mode_active.patch powerpc-mm-replace-batch-active-with-is_lazy_mmu_mode_active.patch sparc-mm-replace-batch-active-with-is_lazy_mmu_mode_active.patch x86-xen-use-lazy_mmu_state-when-context-switching.patch mm-add-basic-tests-for-lazy_mmu.patch mm-add-basic-tests-for-lazy_mmu-fix-fix-fix.patch selftests-mm-default-kdir-to-build-directory.patch selftests-mm-remove-flaky-header-check.patch selftests-mm-pass-down-full-cc-and-cflags-to-check_configsh.patch selftests-mm-fix-usage-of-force_read-in-cow-tests.patch selftests-mm-introduce-helper-to-read-every-page-in-range.patch selftests-mm-fix-faulting-in-code-in-pagemap_ioctl-test.patch selftests-mm-fix-exit-code-in-pagemap_ioctl.patch selftests-mm-report-skip-in-pfnmap-if-a-check-fails.patch