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 1ACD4199A2 for ; Mon, 15 Jul 2024 09:31:39 +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=1721035900; cv=none; b=i55ssaqcd9cp4hduCGRFjABvPksc5QTX7sP1QNinShYntHZEYPvcWiEpPCAWzxIyXyIxvaCvKjmx+wUlq9gQajDvSxGozNS+oWqwtHb0AmGVJl0Bw0g2eWMCoHyfYW80T0AVG68e2F9f2Wx3lFCxhdsQ+GoufuZAFaFWywuPCf0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721035900; c=relaxed/simple; bh=PCtklBOH92Z7jQ4i3JTcRxfyLrIZL5jjXEBNBK7DgM8=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=M+cwClBKgHoYNB68rnbZ3EKH6Y0/OhVrUUvejFTJEEGE/nlETsuPU4s0RJr7VzH56D15ooGc2MyQ2V2B84/dDyNf2GHMBjvEuxwdWoCUAUnYtlxH+iEk0HwIK/zd7MV2LtzHemErIetAUsNBVzYMxUEZh3ddRbVIXIPd6sm41/c= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=c8tpkUjc; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="c8tpkUjc" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 30073C32782; Mon, 15 Jul 2024 09:31:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1721035899; bh=PCtklBOH92Z7jQ4i3JTcRxfyLrIZL5jjXEBNBK7DgM8=; h=Subject:To:Cc:From:Date:From; b=c8tpkUjcQ7Hv1DtAKW5B5qz4EkU6XUBzXE0ZM8PI2ACbPWlNNBwS4W+7EOmdzVanF U6xguCRrv1PpQFRaZFWnNqJ3BIMAWIv1GCCzzA9vPqE/Ggf2WORIys5AWOCLiEDymh +yH5MAz4lMZlH+j/sWga0H4aFMpI29MfELYQzUgQ= Subject: FAILED: patch "[PATCH] mm/filemap: skip to create PMD-sized page cache if needed" failed to apply to 6.1-stable tree To: gshan@redhat.com,akpm@linux-foundation.org,david@redhat.com,ddutile@redhat.com,djwong@kernel.org,hughd@google.com,ryan.roberts@arm.com,stable@vger.kernel.org,torvalds@linux-foundation.org,william.kucharski@oracle.com,willy@infradead.org,zhenyzha@redhat.com Cc: From: Date: Mon, 15 Jul 2024 11:31:36 +0200 Message-ID: <2024071536-overreach-kite-5c51@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit The patch below does not apply to the 6.1-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.1.y git checkout FETCH_HEAD git cherry-pick -x 3390916aca7af1893ed2ebcdfee1d6fdb65bb058 # git commit -s git send-email --to '' --in-reply-to '2024071536-overreach-kite-5c51@gregkh' --subject-prefix 'PATCH 6.1.y' HEAD^.. Possible dependencies: 3390916aca7a ("mm/filemap: skip to create PMD-sized page cache if needed") thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 3390916aca7af1893ed2ebcdfee1d6fdb65bb058 Mon Sep 17 00:00:00 2001 From: Gavin Shan Date: Thu, 27 Jun 2024 10:39:51 +1000 Subject: [PATCH] mm/filemap: skip to create PMD-sized page cache if needed On ARM64, HPAGE_PMD_ORDER is 13 when the base page size is 64KB. The PMD-sized page cache can't be supported by xarray as the following error messages indicate. ------------[ cut here ]------------ WARNING: CPU: 35 PID: 7484 at lib/xarray.c:1025 xas_split_alloc+0xf8/0x128 Modules linked in: nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib \ nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct \ nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 \ ip_set rfkill nf_tables nfnetlink vfat fat virtio_balloon drm \ fuse xfs libcrc32c crct10dif_ce ghash_ce sha2_ce sha256_arm64 \ sha1_ce virtio_net net_failover virtio_console virtio_blk failover \ dimlib virtio_mmio CPU: 35 PID: 7484 Comm: test Kdump: loaded Tainted: G W 6.10.0-rc5-gavin+ #9 Hardware name: QEMU KVM Virtual Machine, BIOS edk2-20240524-1.el9 05/24/2024 pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : xas_split_alloc+0xf8/0x128 lr : split_huge_page_to_list_to_order+0x1c4/0x720 sp : ffff800087a4f6c0 x29: ffff800087a4f6c0 x28: ffff800087a4f720 x27: 000000001fffffff x26: 0000000000000c40 x25: 000000000000000d x24: ffff00010625b858 x23: ffff800087a4f720 x22: ffffffdfc0780000 x21: 0000000000000000 x20: 0000000000000000 x19: ffffffdfc0780000 x18: 000000001ff40000 x17: 00000000ffffffff x16: 0000018000000000 x15: 51ec004000000000 x14: 0000e00000000000 x13: 0000000000002000 x12: 0000000000000020 x11: 51ec000000000000 x10: 51ece1c0ffff8000 x9 : ffffbeb961a44d28 x8 : 0000000000000003 x7 : ffffffdfc0456420 x6 : ffff0000e1aa6eb8 x5 : 20bf08b4fe778fca x4 : ffffffdfc0456420 x3 : 0000000000000c40 x2 : 000000000000000d x1 : 000000000000000c x0 : 0000000000000000 Call trace: xas_split_alloc+0xf8/0x128 split_huge_page_to_list_to_order+0x1c4/0x720 truncate_inode_partial_folio+0xdc/0x160 truncate_inode_pages_range+0x1b4/0x4a8 truncate_pagecache_range+0x84/0xa0 xfs_flush_unmap_range+0x70/0x90 [xfs] xfs_file_fallocate+0xfc/0x4d8 [xfs] vfs_fallocate+0x124/0x2e8 ksys_fallocate+0x4c/0xa0 __arm64_sys_fallocate+0x24/0x38 invoke_syscall.constprop.0+0x7c/0xd8 do_el0_svc+0xb4/0xd0 el0_svc+0x44/0x1d8 el0t_64_sync_handler+0x134/0x150 el0t_64_sync+0x17c/0x180 Fix it by skipping to allocate PMD-sized page cache when its size is larger than MAX_PAGECACHE_ORDER. For this specific case, we will fall to regular path where the readahead window is determined by BDI's sysfs file (read_ahead_kb). Link: https://lkml.kernel.org/r/20240627003953.1262512-4-gshan@redhat.com Fixes: 4687fdbb805a ("mm/filemap: Support VM_HUGEPAGE for file mappings") Signed-off-by: Gavin Shan Suggested-by: David Hildenbrand Acked-by: David Hildenbrand Cc: Darrick J. Wong Cc: Don Dutile Cc: Hugh Dickins Cc: Linus Torvalds Cc: Matthew Wilcox (Oracle) Cc: Ryan Roberts Cc: William Kucharski Cc: Zhenyu Zhang Cc: [5.18+] Signed-off-by: Andrew Morton diff --git a/mm/filemap.c b/mm/filemap.c index 54b15bb96056..fedefb10d947 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -3124,7 +3124,7 @@ static struct file *do_sync_mmap_readahead(struct vm_fault *vmf) #ifdef CONFIG_TRANSPARENT_HUGEPAGE /* Use the readahead code, even if readahead is disabled */ - if (vm_flags & VM_HUGEPAGE) { + if ((vm_flags & VM_HUGEPAGE) && HPAGE_PMD_ORDER <= MAX_PAGECACHE_ORDER) { fpin = maybe_unlock_mmap_for_io(vmf, fpin); ractl._index &= ~((unsigned long)HPAGE_PMD_NR - 1); ra->size = HPAGE_PMD_NR;