From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3E90AC43381 for ; Wed, 27 Mar 2019 18:03:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0FCE721734 for ; Wed, 27 Mar 2019 18:03:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553709801; bh=aXhc8/8dQcGfgrzvjDxHfcfZhubmELaV7gE+FER6Ig4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=TIGsREP8hibZKnQm3KCbHEh3i8fiKlXXu0lJja2un6N/I1tLh5w2OJhO0tkEs1vBg VTq/J7ixf3bflsgJcwzGUbIiHyRZhraCIUoJtFBpfAuCzCVcp4M/cy0gilW4HN8Z0E ysxx6DbYHSeaWMeAkDD61gtuaw7qd0S1i4/e9Aw4= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732279AbfC0SDT (ORCPT ); Wed, 27 Mar 2019 14:03:19 -0400 Received: from mail.kernel.org ([198.145.29.99]:43418 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732189AbfC0SDQ (ORCPT ); Wed, 27 Mar 2019 14:03:16 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 801742075C; Wed, 27 Mar 2019 18:03:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553709795; bh=aXhc8/8dQcGfgrzvjDxHfcfZhubmELaV7gE+FER6Ig4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=IzvxpoeT3ofJsx4NaSb/9DjPU84B9xqCrNIW/1H1vlim16eixyeOxS1XsLQEjOLA3 EtdZIrF8n0MzU4tE8k4EIfF1q6mVw1G/zP3h+urqcVQNv3DDcuL2IrZmIcW70DLEQ0 +V3f66OmO0nPpo2bGQhNDgWfoNMeHNkcji1hVaW4= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Sahitya Tummala , Jaegeuk Kim , Sasha Levin , linux-f2fs-devel@lists.sourceforge.net Subject: [PATCH AUTOSEL 5.0 041/262] f2fs: do not use mutex lock in atomic context Date: Wed, 27 Mar 2019 13:58:16 -0400 Message-Id: <20190327180158.10245-41-sashal@kernel.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190327180158.10245-1-sashal@kernel.org> References: <20190327180158.10245-1-sashal@kernel.org> MIME-Version: 1.0 X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Sahitya Tummala [ Upstream commit 9083977dabf3833298ddcd40dee28687f1e6b483 ] Fix below warning coming because of using mutex lock in atomic context. BUG: sleeping function called from invalid context at kernel/locking/mutex.c:98 in_atomic(): 1, irqs_disabled(): 0, pid: 585, name: sh Preemption disabled at: __radix_tree_preload+0x28/0x130 Call trace: dump_backtrace+0x0/0x2b4 show_stack+0x20/0x28 dump_stack+0xa8/0xe0 ___might_sleep+0x144/0x194 __might_sleep+0x58/0x8c mutex_lock+0x2c/0x48 f2fs_trace_pid+0x88/0x14c f2fs_set_node_page_dirty+0xd0/0x184 Do not use f2fs_radix_tree_insert() to avoid doing cond_resched() with spin_lock() acquired. Signed-off-by: Sahitya Tummala Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim Signed-off-by: Sasha Levin --- fs/f2fs/trace.c | 20 +++++++++++++------- 1 file changed, 13 insertions(+), 7 deletions(-) diff --git a/fs/f2fs/trace.c b/fs/f2fs/trace.c index ce2a5eb210b6..d0ab533a9ce8 100644 --- a/fs/f2fs/trace.c +++ b/fs/f2fs/trace.c @@ -14,7 +14,7 @@ #include "trace.h" static RADIX_TREE(pids, GFP_ATOMIC); -static struct mutex pids_lock; +static spinlock_t pids_lock; static struct last_io_info last_io; static inline void __print_last_io(void) @@ -58,23 +58,29 @@ void f2fs_trace_pid(struct page *page) set_page_private(page, (unsigned long)pid); +retry: if (radix_tree_preload(GFP_NOFS)) return; - mutex_lock(&pids_lock); + spin_lock(&pids_lock); p = radix_tree_lookup(&pids, pid); if (p == current) goto out; if (p) radix_tree_delete(&pids, pid); - f2fs_radix_tree_insert(&pids, pid, current); + if (radix_tree_insert(&pids, pid, current)) { + spin_unlock(&pids_lock); + radix_tree_preload_end(); + cond_resched(); + goto retry; + } trace_printk("%3x:%3x %4x %-16s\n", MAJOR(inode->i_sb->s_dev), MINOR(inode->i_sb->s_dev), pid, current->comm); out: - mutex_unlock(&pids_lock); + spin_unlock(&pids_lock); radix_tree_preload_end(); } @@ -119,7 +125,7 @@ void f2fs_trace_ios(struct f2fs_io_info *fio, int flush) void f2fs_build_trace_ios(void) { - mutex_init(&pids_lock); + spin_lock_init(&pids_lock); } #define PIDVEC_SIZE 128 @@ -147,7 +153,7 @@ void f2fs_destroy_trace_ios(void) pid_t next_pid = 0; unsigned int found; - mutex_lock(&pids_lock); + spin_lock(&pids_lock); while ((found = gang_lookup_pids(pid, next_pid, PIDVEC_SIZE))) { unsigned idx; @@ -155,5 +161,5 @@ void f2fs_destroy_trace_ios(void) for (idx = 0; idx < found; idx++) radix_tree_delete(&pids, pid[idx]); } - mutex_unlock(&pids_lock); + spin_unlock(&pids_lock); } -- 2.19.1