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 3205C4D8DA6 for ; Mon, 11 May 2026 21:35:15 +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=1778535315; cv=none; b=Khi1I9IIwFF9LyVmzo0YJIZLWi8XymkAhvV1ayvhSmBhxBMqg9IU2N3s7+NxwOyNqEkVqToASTTe9inbigQ8yfQKOXSfC9wKJUJSt/w0RRhyuY9RtnRt+yIA5cWy0wfxleWKOPKIsnpeah7FlXbz1NMNKXPhRIe/4CteJtEAFDw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778535315; c=relaxed/simple; bh=Aju4j6ll0tLlApnU//Dh8TiRYV+pjB00kCHgIOE1rtQ=; h=Date:To:From:Subject:Message-Id; b=Ucpho6i8TP2vaxGsm5L4zbSLgYQ58RTVeMdUmmooeqmGlnWZTcduNKb56gwKLmmTf1BPL8CLC1ekSdJ2rOayseJWFNri4+dVoiLrBAwLblSHqgB6ENybvAhQeFuOTcYGrXmAaFLfywIS5oySI3/in5tclIDwseriy8ONLdNawmQ= 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=ATKoxdpt; 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="ATKoxdpt" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 080F7C2BCB0; Mon, 11 May 2026 21:35:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1778535315; bh=Aju4j6ll0tLlApnU//Dh8TiRYV+pjB00kCHgIOE1rtQ=; h=Date:To:From:Subject:From; b=ATKoxdptP1PhWWpDKLjxq7lBUS3ksucnyJR6d/Yxdqfv/2CyY0Adl5trb8iWL/dfV gqXxFMUL4rb/n9MMPSoZu+wpRqCHUks1d+J5svq3c1bULTor44wHeJczCftU2jtnQg aIhKmuBLWtrAC7ZqzHki2qIBQAcc1aHTKlD7HfVc= Date: Mon, 11 May 2026 14:35:14 -0700 To: mm-commits@vger.kernel.org,rppt@kernel.org,akpm@linux-foundation.org From: Andrew Morton Subject: + selftests-mm-move-read_file-read_num-and-write_num-to-vm_util.patch added to mm-new branch Message-Id: <20260511213515.080F7C2BCB0@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: move read_file(), read_num() and write_num() to vm_util has been added to the -mm mm-new branch. Its filename is selftests-mm-move-read_file-read_num-and-write_num-to-vm_util.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-mm-move-read_file-read_num-and-write_num-to-vm_util.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 If a few days of testing in mm-new is successful, the patch will me moved into mm.git's mm-unstable branch, which is 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: "Mike Rapoport (Microsoft)" Subject: selftests/mm: move read_file(), read_num() and write_num() to vm_util Date: Mon, 11 May 2026 19:28:13 +0300 These are useful helpers for writing and reading sysfs and proc files. Make them available to the tests that don't use thp_settings. While on it make write_num() use "%lu" instead of "%ld" to match 'unsigned long num' argument type. Link: https://lore.kernel.org/20260511162840.375890-30-rppt@kernel.org Signed-off-by: Mike Rapoport (Microsoft) Tested-by: Luiz Capitulino Tested-by: Sarthak Sharma Cc: Baolin Wang Cc: Barry Song Cc: David Hildenbrand Cc: Dev Jain Cc: Donet Tom Cc: Jason Gunthorpe Cc: John Hubbard Cc: Lance Yang Cc: Leon Romanovsky Cc: Liam Howlett Cc: Li Wang Cc: Lorenzo Stoakes Cc: Mark Brown Cc: Michal Hocko Cc: Nico Pache Cc: Peter Xu Cc: Ryan Roberts Cc: Shuah Khan Cc: Suren Baghdasaryan Cc: Vlastimil Babka Cc: Zi Yan Signed-off-by: Andrew Morton --- tools/testing/selftests/mm/hugepage_settings.c | 41 --------------- tools/testing/selftests/mm/hugepage_settings.h | 4 - tools/testing/selftests/mm/vm_util.c | 39 ++++++++++++++ tools/testing/selftests/mm/vm_util.h | 3 + 4 files changed, 42 insertions(+), 45 deletions(-) --- a/tools/testing/selftests/mm/hugepage_settings.c~selftests-mm-move-read_file-read_num-and-write_num-to-vm_util +++ a/tools/testing/selftests/mm/hugepage_settings.c @@ -48,47 +48,6 @@ static const char * const shmem_enabled_ NULL }; -int read_file(const char *path, char *buf, size_t buflen) -{ - int fd; - ssize_t numread; - - fd = open(path, O_RDONLY); - if (fd == -1) - return 0; - - numread = read(fd, buf, buflen - 1); - if (numread < 1) { - close(fd); - return 0; - } - - buf[numread] = '\0'; - close(fd); - - return (unsigned int) numread; -} - -unsigned long read_num(const char *path) -{ - char buf[21]; - - if (read_file(path, buf, sizeof(buf)) < 0) { - perror("read_file()"); - exit(EXIT_FAILURE); - } - - return strtoul(buf, NULL, 10); -} - -void write_num(const char *path, unsigned long num) -{ - char buf[21]; - - sprintf(buf, "%ld", num); - write_file(path, buf, strlen(buf) + 1); -} - int thp_read_string(const char *name, const char * const strings[]) { char path[PATH_MAX]; --- a/tools/testing/selftests/mm/hugepage_settings.h~selftests-mm-move-read_file-read_num-and-write_num-to-vm_util +++ a/tools/testing/selftests/mm/hugepage_settings.h @@ -66,10 +66,6 @@ struct thp_settings { struct shmem_hugepages_settings shmem_hugepages[NR_ORDERS]; }; -int read_file(const char *path, char *buf, size_t buflen); -unsigned long read_num(const char *path); -void write_num(const char *path, unsigned long num); - int thp_read_string(const char *name, const char * const strings[]); void thp_write_string(const char *name, const char *val); unsigned long thp_read_num(const char *name); --- a/tools/testing/selftests/mm/vm_util.c~selftests-mm-move-read_file-read_num-and-write_num-to-vm_util +++ a/tools/testing/selftests/mm/vm_util.c @@ -698,6 +698,27 @@ int unpoison_memory(unsigned long pfn) return ret > 0 ? 0 : -errno; } +int read_file(const char *path, char *buf, size_t buflen) +{ + int fd; + ssize_t numread; + + fd = open(path, O_RDONLY); + if (fd == -1) + return 0; + + numread = read(fd, buf, buflen - 1); + if (numread < 1) { + close(fd); + return 0; + } + + buf[numread] = '\0'; + close(fd); + + return (unsigned int) numread; +} + void write_file(const char *path, const char *buf, size_t buflen) { int fd, saved_errno; @@ -721,3 +742,21 @@ void write_file(const char *path, const ksft_exit_fail_msg("%s write(%.*s) is truncated, expected %zu bytes, got %zd bytes\n", path, (int)(buflen - 1), buf, buflen - 1, numwritten); } + +unsigned long read_num(const char *path) +{ + char buf[21]; + + if (read_file(path, buf, sizeof(buf)) < 0) + ksft_exit_fail_perror("read_file()"); + + return strtoul(buf, NULL, 10); +} + +void write_num(const char *path, unsigned long num) +{ + char buf[21]; + + sprintf(buf, "%lu", num); + write_file(path, buf, strlen(buf) + 1); +} --- a/tools/testing/selftests/mm/vm_util.h~selftests-mm-move-read_file-read_num-and-write_num-to-vm_util +++ a/tools/testing/selftests/mm/vm_util.h @@ -165,3 +165,6 @@ int unpoison_memory(unsigned long pfn); #define PAGEMAP_PFN(ent) ((ent) & ((1ull << 55) - 1)) void write_file(const char *path, const char *buf, size_t buflen); +int read_file(const char *path, char *buf, size_t buflen); +unsigned long read_num(const char *path); +void write_num(const char *path, unsigned long num); _ Patches currently in -mm which might be from rppt@kernel.org are maintainers-add-tree-for-kdump-and-kexec.patch maintainers-add-kexec-list-to-live-update-entry.patch sh-fix-fallout-from-zero_page-consolidation.patch selftests-mm-hugetlb-read-hwpoison-add-sigbus-handler.patch selftests-mm-migration-dont-assume-huge-page-is-twomeg.patch selftests-mm-migration-make-nthreads-represent-number-of-working-threads.patch selftests-mm-migration-properly-cleanup-forked-processes.patch selftests-mm-run_vmtestssh-dont-gate-thp-and-ksm-tests-on-have_hugepages.patch selftests-mm-merge-map_hugetlb-into-hugepage-mmap.patch selftests-mm-rename-hugepage-tests-to-hugetlb.patch selftests-mm-hugetlb-shm-use-kselftest-framework.patch selftests-mm-hugetlb-vmemmap-use-kselftest-framework.patch selftests-mm-hugetlb-madvise-use-kselftest-framework.patch selftests-mm-hugetlb_madv_vs_map-use-kselftest-framework.patch selftests-mm-hugetlb-read-hwpoison-use-kselftest-framework.patch selftests-mm-khugepaged-group-tests-in-an-array.patch selftests-mm-khugepaged-use-ksefltest-framework.patch selftests-mm-ksm_tests-use-kselftest-framework.patch selftests-mm-protection_keys-use-descriptive-test-names-in-the-output.patch selftests-mm-protection_keys-use-kselftest-framework.patch selftests-mm-uffd-common-use-kselftest-framework.patch selftests-mm-uffd-stress-use-kselftest-framework.patch selftests-mm-uffd-unit-tests-use-kselftest-framework.patch selftests-mm-va_high_addr_switch-use-kselftest-framework.patch selftests-mm-add-atexit-and-signal-handlers-to-thp_settings.patch selftests-mm-rename-thp_settings-to-hugepage_settings.patch selftests-mm-move-hugetlb-helpers-to-hugepage_settings.patch selftests-mm-hugepage_settings-use-unsigned-long-in-detect_hugetlb_page_size.patch selftests-mm-hugepage_settings-add-apis-to-get-and-set-nr_hugepages.patch selftests-mm-hugepage_settings-rename-and-rework-get_free_hugepages.patch selftests-mm-hugepage_settings-add-apis-for-hugetlb-setup-and-teardown.patch selftests-mm-move-read_file-read_num-and-write_num-to-vm_util.patch selftests-mm-vm_util-add-helpers-to-set-and-restore-shm-limits.patch selftests-mm-compaction_test-use-hugetlb-helpers.patch selftests-mm-cow-add-setup-of-hugetlb-pages.patch selftests-mm-gup_longterm-add-setup-of-hugetlb-pages.patch selftests-mm-gup_test-add-setup-of-hugetlb-pages.patch selftests-mm-hmm-tests-add-setup-of-hugetlb-pages.patch selftests-mm-hugepage_dio-add-setup-of-hugetlb-pages.patch selftests-mm-hugetlb_fault_after_madv-add-setup-of-hugetlb-pages.patch selftests-mm-hugetlb-madvise-add-setup-of-hugetlb-pages.patch selftests-mm-hugetlb_madv_vs_map-add-setup-of-hugetlb-pages.patch selftests-mm-hugetlb-mmap-add-setup-of-hugetlb-pages.patch selftests-mm-hugetlb-mremap-add-setup-of-hugetlb-pages.patch selftests-mm-hugetlb-shm-add-setup-of-hugetlb-pages.patch selftests-mm-hugetlb-soft-offline-add-setup-of-hugetlb-pages.patch selftests-mm-hugetlb-vmemmap-add-setup-of-hugetlb-pages.patch selftests-mm-migration-add-setup-of-hugetlb-pages.patch selftests-mm-pagemap_ioctl-add-setup-of-hugetlb-pages.patch selftests-mm-protection_keys-use-library-code-for-hugetlb-setup.patch selftests-mm-thuge-gen-add-setup-of-hugetlb-pages.patch selftests-mm-uffd-stress-use-hugetlb_save-and-alloc-huge-pages.patch selftests-mm-uffd-unit-tests-add-setup-of-hugetlb-pages.patch selftests-mm-uffd-wp-mremap-add-setup-of-hugetlb-pages.patch selftests-mm-va_high_addr_switch-add-setup-of-hugetlb-pages.patch selftests-mm-va_high_addr_switchsh-drop-huge-pages-setup.patch selftests-mm-run_vmtestssh-free-memory-if-available-memory-is-low.patch selftests-mm-run_vmtestssh-drop-detection-and-setup-of-hugetlb.patch