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 0A1E33D9DD7; Mon, 23 Mar 2026 19:33:27 +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=1774294408; cv=none; b=l+7Ruq5vf48RZlEIKNYLXL5JWliX2zANTdnaI0vHX7HSjE9OULyp9ItGnBsWQZWih9TdTm4DICq9EJFmOMqkGkh3htpybIhIfKnNX9TmHrhklPzK1uJyFjdzfbVLQAVVsW9dUCbj4eJs0XiYOpPsZ/5tPYpe5vfPOSSzKMgUWyY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774294408; c=relaxed/simple; bh=zow9YRq0acOQfoT/XfESlELBk3oR8YQBr/E7jvEyFwI=; h=Date:To:From:Subject:Message-Id; b=frlIxJCv4jMQa3IK7ty9iwZVzj9USFxTTww3hxDJeNalsBVtY9kG20Dey0FZz0gO7aMX/iM97tX4KHgztyza3JKfVVYgjfU47HomiTeRjyR/zOhITtYBLOZCOEqodN6M4YW0fKLiR0ghw/4vskhZ88z+tlnv9rLLSBh42JI2/Kw= 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=XdOPfo/u; 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="XdOPfo/u" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3C301C4CEF7; Mon, 23 Mar 2026 19:33:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1774294407; bh=zow9YRq0acOQfoT/XfESlELBk3oR8YQBr/E7jvEyFwI=; h=Date:To:From:Subject:From; b=XdOPfo/u7nmLWXkJSW2LF8dqOpVx5Cc2jPU5DjWKv0eKu86mIZqPF4x/uV9iL4ylw 60Cw3w98zS3ii2D1WmOZHVlrYOlTX8Q2YnCYaB9Lw/4Uzmwd/4NsU43tT9J3Rjehi1 Zq0tsxrNixnuww8jYsv345FRYurykgfphPseQQkc= Date: Mon, 23 Mar 2026 12:33:26 -0700 To: mm-commits@vger.kernel.org,wangkefeng.wang@huawei.com,vbabka@kernel.org,surenb@google.com,sunnanyong@huawei.com,stable@vger.kernel.org,ryan.roberts@arm.com,rppt@kernel.org,mhocko@suse.com,ljs@kernel.org,liam.howlett@oracle.com,david@kernel.org,baohua@kernel.org,tujinjiang@huawei.com,akpm@linux-foundation.org From: Andrew Morton Subject: + mm-huge_memory-fix-folio-isnt-locked-in-softleaf_to_folio-v4.patch added to mm-hotfixes-unstable branch Message-Id: <20260323193327.3C301C4CEF7@smtp.kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: mm-huge_memory-fix-folio-isnt-locked-in-softleaf_to_folio-v4 has been added to the -mm mm-hotfixes-unstable branch. Its filename is mm-huge_memory-fix-folio-isnt-locked-in-softleaf_to_folio-v4.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-huge_memory-fix-folio-isnt-locked-in-softleaf_to_folio-v4.patch This patch will later appear in the mm-hotfixes-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm 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: Jinjiang Tu Subject: mm-huge_memory-fix-folio-isnt-locked-in-softleaf_to_folio-v4 Date: Sat, 21 Mar 2026 15:52:14 +0800 update function name and comments Link: https://lkml.kernel.org/r/20260321075214.3305564-1-tujinjiang@huawei.com Fixes: e9b61f19858a ("thp: reintroduce split_huge_page()") Signed-off-by: Jinjiang Tu Acked-by: David Hildenbrand (Arm) Reviewed-by: Lorenzo Stoakes (Oracle) Cc: Cc: Barry Song Cc: Kefeng Wang Cc: Liam Howlett Cc: Michal Hocko Cc: Mike Rapoport Cc: Nanyong Sun Cc: Ryan Roberts Cc: Suren Baghdasaryan Cc: Vlastimil Babka Signed-off-by: Andrew Morton --- include/linux/leafops.h | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-) --- a/include/linux/leafops.h~mm-huge_memory-fix-folio-isnt-locked-in-softleaf_to_folio-v4 +++ a/include/linux/leafops.h @@ -363,10 +363,14 @@ static inline unsigned long softleaf_to_ return swp_offset(entry) & SWP_PFN_MASK; } -static inline void softleaf_migration_entry_check(softleaf_t entry, - struct folio *folio) +static inline void softleaf_migration_sync(softleaf_t entry, + struct folio *folio) { - /* See __split_folio_to_order() comment */ + /* + * Ensure we do not race with split, which might alter tail pages into new + * folios and thus result in observing an unlocked folio. + * This matches the write barrier in __split_folio_to_order(). + */ smp_rmb(); /* @@ -388,7 +392,7 @@ static inline struct page *softleaf_to_p VM_WARN_ON_ONCE(!softleaf_has_pfn(entry)); if (softleaf_is_migration(entry)) - softleaf_migration_entry_check(entry, page_folio(page)); + softleaf_migration_sync(entry, page_folio(page)); return page; } @@ -405,7 +409,7 @@ static inline struct folio *softleaf_to_ VM_WARN_ON_ONCE(!softleaf_has_pfn(entry)); if (softleaf_is_migration(entry)) - softleaf_migration_entry_check(entry, folio); + softleaf_migration_sync(entry, folio); return folio; } _ Patches currently in -mm which might be from tujinjiang@huawei.com are mm-huge_memory-fix-folio-isnt-locked-in-softleaf_to_folio.patch mm-huge_memory-fix-folio-isnt-locked-in-softleaf_to_folio-v4.patch mm-hugetlb-fix-memory-offline-failure-due-to-hwpoisoned-file-hugetlb.patch