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 066622571BC for ; Tue, 23 Sep 2025 03:18:18 +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=1758597498; cv=none; b=tLahTXlrqdkh5mq5pISuAa09SBhGQI42gIpQUHiGnyzvOWclOeZ5pzOKla8RGdEtseRyspP6A87KKrozfiQ6n39MnPoa+VmHnikFjkRTGyKYNdzLocxjXEdHVGNABWaBgMkkQw5v0b+6BBO7GI8MtBG25muMOCeO9gzTBT3xeVY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758597498; c=relaxed/simple; bh=NZVwGwO7NqSUjiYofp98KFK4zhPOhM8F5HVxZ31dGFo=; h=Date:To:From:Subject:Message-Id; b=glajckNZKoytxOMxaQ9v5qA5cuXjY6fSv7QVXEBO1KrQVRJ+sqzGV+hNPI+RbbHe2p392ya/KC/IzjgcRnb2z+nOIXu3YiUsYCzGBR+kGn+zP2FAgoRVAKuwCjUd0E8SwYXJZ2kpZev6iln47QLuvNwEeO2QoVDvgzgXxoXVI7A= 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=Lq0rWjQe; 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="Lq0rWjQe" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C1302C4CEF0; Tue, 23 Sep 2025 03:18:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1758597497; bh=NZVwGwO7NqSUjiYofp98KFK4zhPOhM8F5HVxZ31dGFo=; h=Date:To:From:Subject:From; b=Lq0rWjQeDLrToUaAIFFB7XrxgVWMt9wP1wFML9CapEzQrl+c/db2vN/jLIUnZB5Lw eUvGtLB28gOIci/1pBcSxz9nK4qfMmzVF7jl5HAA17l0BSDT1OFYunGlJCshqQwxux k6rN/CnD8VduCmjtlnHFG2Bk11Or+NqO4bc2+/Hk= Date: Mon, 22 Sep 2025 20:18:17 -0700 To: mm-commits@vger.kernel.org,willy@infradead.org,will@kernel.org,vishal.l.verma@intel.com,viro@zeniv.linux.org.uk,vgoyal@redhat.com,vbabka@suse.cz,urezki@gmail.com,tsbogend@alpha.franken.de,tony.luck@intel.com,svens@linux.ibm.com,surenb@google.com,rppt@kernel.org,robin.murphy@arm.com,reinette.chatre@intel.com,pfalcato@suse.de,osalvador@suse.de,nico@fluxnic.net,muchun.song@linux.dev,mhocko@suse.com,liam.howlett@oracle.com,kevin.tian@intel.com,jgg@nvidia.com,jannh@google.com,james.morse@arm.com,jack@suse.cz,hughd@google.com,hca@linux.ibm.com,guoren@kernel.org,gregkh@linuxfoundation.org,gor@linux.ibm.com,dyoung@redhat.com,dvyukov@google.com,david@redhat.com,davem@davemloft.net,dave.martin@arm.com,dave.jiang@intel.com,dan.j.williams@intel.com,corbet@lwn.net,brauner@kernel.org,borntraeger@linux.ibm.com,bhe@redhat.com,baolin.wang@linux.alibaba.com,arnd@arndb.de,andreyknvl@gmail.com,andreas@gaisler.com,almaz.alexandrovich@paragon-software.com,agordeev@linux.ibm.com,lorenzo.stoakes@oracle.com,akpm@linux-foundation.org From: Andrew Morton Subject: [merged mm-stable] mm-add-shmem_zero_setup_desc.patch removed from -mm tree Message-Id: <20250923031817.C1302C4CEF0@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The quilt patch titled Subject: mm: add shmem_zero_setup_desc() has been removed from the -mm tree. Its filename was mm-add-shmem_zero_setup_desc.patch This patch was dropped because it was merged into the mm-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm ------------------------------------------------------ From: Lorenzo Stoakes Subject: mm: add shmem_zero_setup_desc() Date: Wed, 17 Sep 2025 20:11:14 +0100 Add the ability to set up a shared anonymous mapping based on a VMA descriptor rather than a VMA. This is a prerequisite for converting to the char mm driver to use the mmap_prepare hook. Link: https://lkml.kernel.org/r/fe4367c705612574477374ffac8497add2655e43.1758135681.git.lorenzo.stoakes@oracle.com Signed-off-by: Lorenzo Stoakes Reviewed-by: Jason Gunthorpe Cc: Alexander Gordeev Cc: Al Viro Cc: Andreas Larsson Cc: Andrey Konovalov Cc: Arnd Bergmann Cc: Baolin Wang Cc: Baoquan He Cc: Chatre, Reinette Cc: Christian Borntraeger Cc: Christian Brauner Cc: Dan Williams Cc: Dave Jiang Cc: Dave Martin Cc: Dave Young Cc: David Hildenbrand Cc: David S. Miller Cc: Dmitriy Vyukov Cc: Greg Kroah-Hartman Cc: Guo Ren Cc: Heiko Carstens Cc: Hugh Dickins Cc: James Morse Cc: Jan Kara Cc: Jann Horn Cc: Jonathan Corbet Cc: Kevin Tian Cc: Konstantin Komarov Cc: Liam Howlett Cc: "Luck, Tony" Cc: Matthew Wilcox (Oracle) Cc: Michal Hocko Cc: Mike Rapoport Cc: Muchun Song Cc: Nicolas Pitre Cc: Oscar Salvador Cc: Pedro Falcato Cc: Robin Murohy Cc: Suren Baghdasaryan Cc: Sven Schnelle Cc: Thomas Bogendoerfer Cc: "Uladzislau Rezki (Sony)" Cc: Vasily Gorbik Cc: Vishal Verma Cc: Vivek Goyal Cc: Vlastimil Babka Cc: Will Deacon Signed-off-by: Andrew Morton --- include/linux/shmem_fs.h | 3 +- mm/shmem.c | 41 +++++++++++++++++++++++++++++-------- 2 files changed, 35 insertions(+), 9 deletions(-) --- a/include/linux/shmem_fs.h~mm-add-shmem_zero_setup_desc +++ a/include/linux/shmem_fs.h @@ -94,7 +94,8 @@ extern struct file *shmem_kernel_file_se unsigned long flags); extern struct file *shmem_file_setup_with_mnt(struct vfsmount *mnt, const char *name, loff_t size, unsigned long flags); -extern int shmem_zero_setup(struct vm_area_struct *); +int shmem_zero_setup(struct vm_area_struct *vma); +int shmem_zero_setup_desc(struct vm_area_desc *desc); extern unsigned long shmem_get_unmapped_area(struct file *, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags); extern int shmem_lock(struct file *file, int lock, struct ucounts *ucounts); --- a/mm/shmem.c~mm-add-shmem_zero_setup_desc +++ a/mm/shmem.c @@ -5879,14 +5879,9 @@ struct file *shmem_file_setup_with_mnt(s } EXPORT_SYMBOL_GPL(shmem_file_setup_with_mnt); -/** - * shmem_zero_setup - setup a shared anonymous mapping - * @vma: the vma to be mmapped is prepared by do_mmap - */ -int shmem_zero_setup(struct vm_area_struct *vma) +static struct file *__shmem_zero_setup(unsigned long start, unsigned long end, vm_flags_t vm_flags) { - struct file *file; - loff_t size = vma->vm_end - vma->vm_start; + loff_t size = end - start; /* * Cloning a new file under mmap_lock leads to a lock ordering conflict @@ -5894,7 +5889,18 @@ int shmem_zero_setup(struct vm_area_stru * accessible to the user through its mapping, use S_PRIVATE flag to * bypass file security, in the same way as shmem_kernel_file_setup(). */ - file = shmem_kernel_file_setup("dev/zero", size, vma->vm_flags); + return shmem_kernel_file_setup("dev/zero", size, vm_flags); +} + +/** + * shmem_zero_setup - setup a shared anonymous mapping + * @vma: the vma to be mmapped is prepared by do_mmap + * Returns: 0 on success, or error + */ +int shmem_zero_setup(struct vm_area_struct *vma) +{ + struct file *file = __shmem_zero_setup(vma->vm_start, vma->vm_end, vma->vm_flags); + if (IS_ERR(file)) return PTR_ERR(file); @@ -5905,6 +5911,25 @@ int shmem_zero_setup(struct vm_area_stru return 0; } + +/** + * shmem_zero_setup_desc - same as shmem_zero_setup, but determined by VMA + * descriptor for convenience. + * @desc: Describes VMA + * Returns: 0 on success, or error + */ +int shmem_zero_setup_desc(struct vm_area_desc *desc) +{ + struct file *file = __shmem_zero_setup(desc->start, desc->end, desc->vm_flags); + + if (IS_ERR(file)) + return PTR_ERR(file); + + desc->vm_file = file; + desc->vm_ops = &shmem_anon_vm_ops; + + return 0; +} /** * shmem_read_folio_gfp - read into page cache, using specified page allocation flags. _ Patches currently in -mm which might be from lorenzo.stoakes@oracle.com are