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 C1F5837D10C for ; Thu, 26 Mar 2026 23:39:15 +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=1774568355; cv=none; b=J579o4z5WMmcv1zJ3WraNtTKQGcgS5UW8vNP0upSzz5qRIEbKC7W1pEe2dAxdGhgrEoLcZzrSIPw9gTajdPJ/3N2D0tOgwVQvC18H6g31p1uLTBVakgmPIRICoyMnxrRmm+FEB+3rsyJX3c1mn8hQ9Nw0Mq689JUGL8RqaKWo1M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774568355; c=relaxed/simple; bh=w7o2OvbYziyXWXBPPP0ViG9GKdYzBa1BsqffQs/DGiA=; h=Date:To:From:Subject:Message-Id; b=u2QBUxMCvfdJJVFEf1ArW8cIjYtg1fXc5mqIUpA0Wrf7dsglksXtJsSeSmzMfIZIADxoKuEnkXCXxvIL62AHiQNscilIx1fpXgdw/emgSpMahp76DQocDjGMbeMHLKJrnHK0E/TC4Y+H4svUxSY2/aQl44S/Ii8TRNunHFXghME= 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=RbzuATyg; 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="RbzuATyg" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 55182C116C6; Thu, 26 Mar 2026 23:39:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1774568355; bh=w7o2OvbYziyXWXBPPP0ViG9GKdYzBa1BsqffQs/DGiA=; h=Date:To:From:Subject:From; b=RbzuATygcHQ+fEO+rHRjfHNRBtDI7lItITjLxf28V2hL6hjuDu63jlJ5HxeM38hq/ eKcD5c/I9ZtgFATDA7UieV7E43STz1SfuBeapRMHsv53ggyszvQD/3UcCNu4oZ2YlP Ht1oRxMACUWIuY5xb2X0txxXWFfv3YNr/QlQQ3qY= Date: Thu, 26 Mar 2026 16:39:13 -0700 To: mm-commits@vger.kernel.org,rppt@kernel.org,pratyush@kernel.org,pasha.tatashin@soleen.com,jianghaoran@kylinos.cn,duanchenghao@kylinos.cn,akpm@linux-foundation.org From: Andrew Morton Subject: + mm-memfd_luo-remove-unnecessary-memset-in-zero-size-memfd-path.patch added to mm-new branch Message-Id: <20260326233915.55182C116C6@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: mm/memfd_luo: remove unnecessary memset in zero-size memfd path has been added to the -mm mm-new branch. Its filename is mm-memfd_luo-remove-unnecessary-memset-in-zero-size-memfd-path.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-memfd_luo-remove-unnecessary-memset-in-zero-size-memfd-path.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: Chenghao Duan Subject: mm/memfd_luo: remove unnecessary memset in zero-size memfd path Date: Thu, 26 Mar 2026 16:47:23 +0800 The memset(kho_vmalloc, 0, sizeof(*kho_vmalloc)) call in the zero-size file handling path is unnecessary because the allocation of the ser structure already uses the __GFP_ZERO flag, ensuring the memory is already zero-initialized. Link: https://lkml.kernel.org/r/20260326084727.118437-4-duanchenghao@kylinos.cn Signed-off-by: Chenghao Duan Reviewed-by: Pratyush Yadav Reviewed-by: Pasha Tatashin Reviewed-by: Mike Rapoport (Microsoft) Cc: Haoran Jiang Signed-off-by: Andrew Morton --- mm/memfd_luo.c | 1 - 1 file changed, 1 deletion(-) --- a/mm/memfd_luo.c~mm-memfd_luo-remove-unnecessary-memset-in-zero-size-memfd-path +++ a/mm/memfd_luo.c @@ -105,7 +105,6 @@ static int memfd_luo_preserve_folios(str if (!size) { *nr_foliosp = 0; *out_folios_ser = NULL; - memset(kho_vmalloc, 0, sizeof(*kho_vmalloc)); return 0; } _ Patches currently in -mm which might be from duanchenghao@kylinos.cn are mm-memfd-use-folio_nr_pages-for-shmem-inode-accounting.patch mm-memfd_luo-optimize-shmem_recalc_inode-calls-in-retrieve-path.patch mm-memfd_luo-remove-unnecessary-memset-in-zero-size-memfd-path.patch mm-memfd_luo-use-i_size_write-to-set-inode-size-during-retrieve.patch mm-memfd_luo-fix-physical-address-conversion-in-put_folios-cleanup.patch mm-memfd_luo-remove-folio-from-page-cache-when-accounting-fails.patch mm-memfd_luo-fix-integer-overflow-in-memfd_luo_preserve_folios.patch