From mboxrd@z Thu Jan 1 00:00:00 1970 From: akpm@linux-foundation.org Subject: [merged] mm-nommu-share-the-i_mmap_rwsem.patch removed from -mm tree Date: Sat, 13 Dec 2014 20:06:41 -0800 Message-ID: <548d0cd1.8VL0nocBpm2skLhj%akpm@linux-foundation.org> Reply-To: linux-kernel@vger.kernel.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Return-path: Received: from mail.linuxfoundation.org ([140.211.169.12]:47483 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751778AbaLNEGd (ORCPT ); Sat, 13 Dec 2014 23:06:33 -0500 Sender: mm-commits-owner@vger.kernel.org List-Id: mm-commits@vger.kernel.org To: dave@stgolabs.net, dbueso@suse.de, hughd@google.com, kirill@shutemov.name, mgorman@suse.de, oleg@redhat.com, peterz@infradead.org, riel@redhat.com, srikar@linux.vnet.ibm.com, mm-commits@vger.kernel.org The patch titled Subject: mm/nommu: share the i_mmap_rwsem has been removed from the -mm tree. Its filename was mm-nommu-share-the-i_mmap_rwsem.patch This patch was dropped because it was merged into mainline or a subsystem tree ------------------------------------------------------ From: Davidlohr Bueso Subject: mm/nommu: share the i_mmap_rwsem Shrinking/truncate logic can call nommu_shrink_inode_mappings() to verify that any shared mappings of the inode in question aren't broken (dead zone). afaict the only user being ramfs to handle the size change attribute. Pretty much a no-brainer to share the lock. Signed-off-by: Davidlohr Bueso Acked-by: "Kirill A. Shutemov" Acked-by: Hugh Dickins Cc: Oleg Nesterov Acked-by: Peter Zijlstra (Intel) Cc: Rik van Riel Cc: Srikar Dronamraju Acked-by: Mel Gorman Signed-off-by: Andrew Morton --- mm/nommu.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) diff -puN mm/nommu.c~mm-nommu-share-the-i_mmap_rwsem mm/nommu.c --- a/mm/nommu.c~mm-nommu-share-the-i_mmap_rwsem +++ a/mm/nommu.c @@ -2094,14 +2094,14 @@ int nommu_shrink_inode_mappings(struct i high = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; down_write(&nommu_region_sem); - i_mmap_lock_write(inode->i_mapping); + i_mmap_lock_read(inode->i_mapping); /* search for VMAs that fall within the dead zone */ vma_interval_tree_foreach(vma, &inode->i_mapping->i_mmap, low, high) { /* found one - only interested if it's shared out of the page * cache */ if (vma->vm_flags & VM_SHARED) { - i_mmap_unlock_write(inode->i_mapping); + i_mmap_unlock_read(inode->i_mapping); up_write(&nommu_region_sem); return -ETXTBSY; /* not quite true, but near enough */ } @@ -2113,8 +2113,7 @@ int nommu_shrink_inode_mappings(struct i * we don't check for any regions that start beyond the EOF as there * shouldn't be any */ - vma_interval_tree_foreach(vma, &inode->i_mapping->i_mmap, - 0, ULONG_MAX) { + vma_interval_tree_foreach(vma, &inode->i_mapping->i_mmap, 0, ULONG_MAX) { if (!(vma->vm_flags & VM_SHARED)) continue; @@ -2129,7 +2128,7 @@ int nommu_shrink_inode_mappings(struct i } } - i_mmap_unlock_write(inode->i_mapping); + i_mmap_unlock_read(inode->i_mapping); up_write(&nommu_region_sem); return 0; } _ Patches currently in -mm which might be from dave@stgolabs.net are origin.patch