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 0839D1925BC for ; Sun, 11 Jan 2026 01:58:07 +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=1768096688; cv=none; b=T9B6CtCKFRZ098tK/PDjry2lc8GS9dJVDPWRTVBDSjaV5nhzECRwKFMOeXmvsbKFmgsVrPsiZuUKxBZKMaL8cYFkuft1EUF0IDjthOvpbEVTMq2pDd3Qw9BiiOpX1vAIh8KnW0Rep9FoHEaQh1OQ/RxHcXuupsMRoVztKLBETNw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768096688; c=relaxed/simple; bh=id5QjKasCuYUYtymjfXiuZcfBCRU77Py8+U/tiMN2w8=; h=Date:To:From:Subject:Message-Id; b=o21QGhHxegaLTPKodeukfDVUCNkBdtLSR1CP86LE+e6s3C/8xaMpxlz6VteCq3knaV6A7pDfqYC8TOsSWgSURV72ffUA6+r31L3x4BPb+n5cr2BkdPgqQ8pqr+z78OrPpLSTBnFYNGyJiGHSqnAavlScwt+eAPFCEc2RKvobU9c= 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=J8/4mqJI; 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="J8/4mqJI" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BC746C4CEF1; Sun, 11 Jan 2026 01:58:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1768096687; bh=id5QjKasCuYUYtymjfXiuZcfBCRU77Py8+U/tiMN2w8=; h=Date:To:From:Subject:From; b=J8/4mqJIau2oTsTQZRvpPr2CzYAYI32WUW9kBds2mPzJY2jQfOvrxRm3WW3YfxOol Z2OIivkqRGfx0M1WrTPJCP3ovFuGIGEBxHVGZ6OdfmS89t4DiFA8hiNIqD+l0pJeMT Kpy14LUnN73FYbBmo/zTiP+x1Xn9DBrxi5pZwAEs= Date: Sat, 10 Jan 2026 17:58:07 -0800 To: mm-commits@vger.kernel.org,ziy@nvidia.com,willy@infradead.org,vbabka@suse.cz,sidhartha.kumar@oracle.com,osalvador@suse.de,muchun.song@linux.dev,jane.chu@oracle.com,jackmanb@google.com,hannes@cmpxchg.org,david@redhat.com,claudiu.beznea.uj@bp.renesas.com,broonie@kernel.org,wangkefeng.wang@huawei.com,akpm@linux-foundation.org From: Andrew Morton Subject: + mm-cma-add-cma_alloc_frozen_compound.patch added to mm-new branch Message-Id: <20260111015807.BC746C4CEF1@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: mm: cma: add cma_alloc_frozen{_compound}() has been added to the -mm mm-new branch. Its filename is mm-cma-add-cma_alloc_frozen_compound.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-cma-add-cma_alloc_frozen_compound.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: Kefeng Wang Subject: mm: cma: add cma_alloc_frozen{_compound}() Date: Fri, 9 Jan 2026 17:31:35 +0800 Introduce cma_alloc_frozen{_compound}() helper to alloc pages without incrementing their refcount, then convert hugetlb cma to use the cma_alloc_frozen_compound() and cma_release_frozen() and remove the unused cma_{alloc,free}_folio(), also move the cma_validate_zones() into mm/internal.h since no outside user. The set_pages_refcounted() is only called to set non-compound pages after above changes, so remove the processing about PageHead. Link: https://lkml.kernel.org/r/20260109093136.1491549-6-wangkefeng.wang@huawei.com Signed-off-by: Kefeng Wang Reviewed-by: Zi Yan Cc: Brendan Jackman Cc: David Hildenbrand Cc: Jane Chu Cc: Johannes Weiner Cc: Matthew Wilcox (Oracle) Cc: Muchun Song Cc: Oscar Salvador Cc: Sidhartha Kumar Cc: Vlastimil Babka Cc: Claudiu Beznea Cc: Mark Brown Signed-off-by: Andrew Morton --- include/linux/cma.h | 26 ++-------- mm/cma.c | 107 ++++++++++++++++++++++++++++-------------- mm/hugetlb_cma.c | 24 +++++---- mm/internal.h | 10 +-- 4 files changed, 97 insertions(+), 70 deletions(-) --- a/include/linux/cma.h~mm-cma-add-cma_alloc_frozen_compound +++ a/include/linux/cma.h @@ -51,29 +51,15 @@ extern struct page *cma_alloc(struct cma bool no_warn); extern bool cma_release(struct cma *cma, const struct page *pages, unsigned long count); +struct page *cma_alloc_frozen(struct cma *cma, unsigned long count, + unsigned int align, bool no_warn); +struct page *cma_alloc_frozen_compound(struct cma *cma, unsigned int order); +bool cma_release_frozen(struct cma *cma, const struct page *pages, + unsigned long count); + extern int cma_for_each_area(int (*it)(struct cma *cma, void *data), void *data); extern bool cma_intersects(struct cma *cma, unsigned long start, unsigned long end); extern void cma_reserve_pages_on_error(struct cma *cma); -#ifdef CONFIG_CMA -struct folio *cma_alloc_folio(struct cma *cma, int order, gfp_t gfp); -bool cma_free_folio(struct cma *cma, const struct folio *folio); -bool cma_validate_zones(struct cma *cma); -#else -static inline struct folio *cma_alloc_folio(struct cma *cma, int order, gfp_t gfp) -{ - return NULL; -} - -static inline bool cma_free_folio(struct cma *cma, const struct folio *folio) -{ - return false; -} -static inline bool cma_validate_zones(struct cma *cma) -{ - return false; -} -#endif - #endif --- a/mm/cma.c~mm-cma-add-cma_alloc_frozen_compound +++ a/mm/cma.c @@ -856,8 +856,8 @@ out: return ret; } -static struct page *__cma_alloc(struct cma *cma, unsigned long count, - unsigned int align, gfp_t gfp) +static struct page *__cma_alloc_frozen(struct cma *cma, + unsigned long count, unsigned int align, gfp_t gfp) { struct page *page = NULL; int ret = -ENOMEM, r; @@ -904,7 +904,6 @@ static struct page *__cma_alloc(struct c trace_cma_alloc_finish(name, page ? page_to_pfn(page) : 0, page, count, align, ret); if (page) { - set_pages_refcounted(page, count); count_vm_event(CMA_ALLOC_SUCCESS); cma_sysfs_account_success_pages(cma, count); } else { @@ -915,6 +914,21 @@ static struct page *__cma_alloc(struct c return page; } +struct page *cma_alloc_frozen(struct cma *cma, unsigned long count, + unsigned int align, bool no_warn) +{ + gfp_t gfp = GFP_KERNEL | (no_warn ? __GFP_NOWARN : 0); + + return __cma_alloc_frozen(cma, count, align, gfp); +} + +struct page *cma_alloc_frozen_compound(struct cma *cma, unsigned int order) +{ + gfp_t gfp = GFP_KERNEL | __GFP_COMP | __GFP_NOWARN; + + return __cma_alloc_frozen(cma, 1 << order, order, gfp); +} + /** * cma_alloc() - allocate pages from contiguous area * @cma: Contiguous memory region for which the allocation is performed. @@ -928,42 +942,26 @@ static struct page *__cma_alloc(struct c struct page *cma_alloc(struct cma *cma, unsigned long count, unsigned int align, bool no_warn) { - return __cma_alloc(cma, count, align, GFP_KERNEL | (no_warn ? __GFP_NOWARN : 0)); -} - -struct folio *cma_alloc_folio(struct cma *cma, int order, gfp_t gfp) -{ struct page *page; - if (WARN_ON(!order || !(gfp & __GFP_COMP))) - return NULL; - - page = __cma_alloc(cma, 1 << order, order, gfp); + page = cma_alloc_frozen(cma, count, align, no_warn); + if (page) + set_pages_refcounted(page, count); - return page ? page_folio(page) : NULL; + return page; } -/** - * cma_release() - release allocated pages - * @cma: Contiguous memory region for which the allocation is performed. - * @pages: Allocated pages. - * @count: Number of allocated pages. - * - * This function releases memory allocated by cma_alloc(). - * It returns false when provided pages do not belong to contiguous area and - * true otherwise. - */ -bool cma_release(struct cma *cma, const struct page *pages, - unsigned long count) +static struct cma_memrange *find_cma_memrange(struct cma *cma, + const struct page *pages, unsigned long count) { - struct cma_memrange *cmr; + struct cma_memrange *cmr = NULL; unsigned long pfn, end_pfn; int r; pr_debug("%s(page %p, count %lu)\n", __func__, (void *)pages, count); if (!cma || !pages || count > cma->count) - return false; + return NULL; pfn = page_to_pfn(pages); @@ -981,27 +979,66 @@ bool cma_release(struct cma *cma, const if (r == cma->nranges) { pr_debug("%s(page %p, count %lu, no cma range matches the page range)\n", __func__, (void *)pages, count); - return false; + return NULL; } - if (PageHead(pages)) - __free_pages((struct page *)pages, compound_order(pages)); - else - free_contig_range(pfn, count); + return cmr; +} + +static void __cma_release_frozen(struct cma *cma, struct cma_memrange *cmr, + const struct page *pages, unsigned long count) +{ + unsigned long pfn = page_to_pfn(pages); + + pr_debug("%s(page %p, count %lu)\n", __func__, (void *)pages, count); + free_contig_frozen_range(pfn, count); cma_clear_bitmap(cma, cmr, pfn, count); cma_sysfs_account_release_pages(cma, count); trace_cma_release(cma->name, pfn, pages, count); +} + +/** + * cma_release() - release allocated pages + * @cma: Contiguous memory region for which the allocation is performed. + * @pages: Allocated pages. + * @count: Number of allocated pages. + * + * This function releases memory allocated by cma_alloc(). + * It returns false when provided pages do not belong to contiguous area and + * true otherwise. + */ +bool cma_release(struct cma *cma, const struct page *pages, + unsigned long count) +{ + struct cma_memrange *cmr; + unsigned long i, pfn; + + cmr = find_cma_memrange(cma, pages, count); + if (!cmr) + return false; + + pfn = page_to_pfn(pages); + for (i = 0; i < count; i++, pfn++) + VM_WARN_ON(!put_page_testzero(pfn_to_page(pfn))); + + __cma_release_frozen(cma, cmr, pages, count); return true; } -bool cma_free_folio(struct cma *cma, const struct folio *folio) +bool cma_release_frozen(struct cma *cma, const struct page *pages, + unsigned long count) { - if (WARN_ON(!folio_test_large(folio))) + struct cma_memrange *cmr; + + cmr = find_cma_memrange(cma, pages, count); + if (!cmr) return false; - return cma_release(cma, &folio->page, folio_nr_pages(folio)); + __cma_release_frozen(cma, cmr, pages, count); + + return true; } int cma_for_each_area(int (*it)(struct cma *cma, void *data), void *data) --- a/mm/hugetlb_cma.c~mm-cma-add-cma_alloc_frozen_compound +++ a/mm/hugetlb_cma.c @@ -20,35 +20,39 @@ static unsigned long hugetlb_cma_size __ void hugetlb_cma_free_folio(struct folio *folio) { - int nid = folio_nid(folio); + folio_ref_dec(folio); - WARN_ON_ONCE(!cma_free_folio(hugetlb_cma[nid], folio)); + WARN_ON_ONCE(!cma_release_frozen(hugetlb_cma[folio_nid(folio)], + &folio->page, folio_nr_pages(folio))); } - struct folio *hugetlb_cma_alloc_folio(int order, gfp_t gfp_mask, int nid, nodemask_t *nodemask) { int node; - struct folio *folio = NULL; + struct folio *folio; + struct page *page = NULL; if (hugetlb_cma[nid]) - folio = cma_alloc_folio(hugetlb_cma[nid], order, gfp_mask); + page = cma_alloc_frozen_compound(hugetlb_cma[nid], order); - if (!folio && !(gfp_mask & __GFP_THISNODE)) { + if (!page && !(gfp_mask & __GFP_THISNODE)) { for_each_node_mask(node, *nodemask) { if (node == nid || !hugetlb_cma[node]) continue; - folio = cma_alloc_folio(hugetlb_cma[node], order, gfp_mask); - if (folio) + page = cma_alloc_frozen_compound(hugetlb_cma[node], order); + if (page) break; } } - if (folio) - folio_set_hugetlb_cma(folio); + if (!page) + return NULL; + set_page_refcounted(page); + folio = page_folio(page); + folio_set_hugetlb_cma(folio); return folio; } --- a/mm/internal.h~mm-cma-add-cma_alloc_frozen_compound +++ a/mm/internal.h @@ -584,11 +584,6 @@ static inline void set_pages_refcounted( { unsigned long pfn = page_to_pfn(page); - if (PageHead(page)) { - set_page_refcounted(page); - return; - } - for (; nr_pages--; pfn++) set_page_refcounted(pfn_to_page(pfn)); } @@ -1022,9 +1017,14 @@ void init_cma_reserved_pageblock(struct struct cma; #ifdef CONFIG_CMA +bool cma_validate_zones(struct cma *cma); void *cma_reserve_early(struct cma *cma, unsigned long size); void init_cma_pageblock(struct page *page); #else +static inline bool cma_validate_zones(struct cma *cma) +{ + return false; +} static inline void *cma_reserve_early(struct cma *cma, unsigned long size) { return NULL; _ Patches currently in -mm which might be from wangkefeng.wang@huawei.com are mm-debug_vm_pgtable-add-debug_vm_pgtable_free_huge_page.patch mm-page_alloc-add-__split_page.patch mm-cma-kill-cma_pages_valid.patch mm-page_alloc-add-alloc_contig_frozen_rangepages.patch mm-cma-add-cma_alloc_frozen_compound.patch mm-hugetlb-allocate-frozen-pages-for-gigantic-allocation.patch