From patchwork Sat Jan 27 02:01:06 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kent Overstreet X-Patchwork-Id: 13533921 Received: from out-179.mta1.migadu.com (out-179.mta1.migadu.com [95.215.58.179]) (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 E2E4AB67F for ; Sat, 27 Jan 2024 02:01:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.179 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706320886; cv=none; b=eIfpN2usAKRAhPHvn5eUyTeHdYksptM7PmssXVNlW7Yqm58yGOz09j9EDVTJA2uDQ0m48fzGEqQUMW58tP7aOQcwjyFZyboAgNI7DtX1FZ/3BXzTARjCeBipCGlsNBPcOAt5utJGaepGkfnXUyXTHPyut6Xr2OtCe4b5IfoJTXY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706320886; c=relaxed/simple; bh=I17n2kJwfLP73JxpOT/4Z+XY1RSDVWFd3kwZEjsB2hg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=M+Cr9ORewhsSHXuENRgU3kjxLLRcqEPyWFBAB/ajI5ambAfUNafYkeuoFsHrj9L9k5LGUyxfWEBq4Uls/Y2bsv2HzWYnnV32S83xHYky+AlCvSGao3cXZtHkuL3lYUIwBLIzBJPXhVoaXt0r/pU74V2ckHujJeCBCT2c2m+cnno= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=e4TNW933; arc=none smtp.client-ip=95.215.58.179 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="e4TNW933" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1706320882; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=dhcmLJc/KPpam9Xa9GT9+fmxCdezLGqepV5bOxUHdOE=; b=e4TNW933G9qVxjcf4lFEpCbSzgbDfoyYa5dvenGHsJ1R4Ve4VK4GP6sJbrTurD0dHHvbJ3 /9Yexwkkli1xL4W2Gy9bLSBa9o+ftgDxjUS8PB2K4ORVChldBDvjSZtGznD6UEgMkAPXjP NrCoucg4nB873RTeBqqvhqP5E4bLUdg= From: Kent Overstreet To: linux-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-fsdevel@vgerkernel.org Cc: Kent Overstreet , peterz@infradead.org, boqun.feng@gmail.com, linux-block@vger.kernel.org, Jens Axboe Subject: [PATCH 2/4] pktcdvd: kill mutex_lock_nested() usage Date: Fri, 26 Jan 2024 21:01:06 -0500 Message-ID: <20240127020111.487218-3-kent.overstreet@linux.dev> In-Reply-To: <20240127020111.487218-1-kent.overstreet@linux.dev> References: <20240127020111.487218-1-kent.overstreet@linux.dev> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Migadu-Flow: FLOW_OUT Unecessary, we're not actually taking nested locks of the same type. Cc: linux-block@vger.kernel.org Cc: Jens Axboe Signed-off-by: Kent Overstreet --- drivers/block/pktcdvd.c | 8 ++++---- fs/pipe.c | 10 +--------- include/linux/lockdep.h | 3 +++ kernel/locking/lockdep.c | 6 ++++++ 4 files changed, 14 insertions(+), 13 deletions(-) diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c index d56d972aadb3..2eb68a624fda 100644 --- a/drivers/block/pktcdvd.c +++ b/drivers/block/pktcdvd.c @@ -332,7 +332,7 @@ static ssize_t device_map_show(const struct class *c, const struct class_attribu { int n = 0; int idx; - mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); + mutex_lock(&ctl_mutex); for (idx = 0; idx < MAX_WRITERS; idx++) { struct pktcdvd_device *pd = pkt_devs[idx]; if (!pd) @@ -2639,7 +2639,7 @@ static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev) struct pktcdvd_device *pd; struct gendisk *disk; - mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); + mutex_lock(&ctl_mutex); for (idx = 0; idx < MAX_WRITERS; idx++) if (!pkt_devs[idx]) @@ -2729,7 +2729,7 @@ static int pkt_remove_dev(dev_t pkt_dev) int idx; int ret = 0; - mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); + mutex_lock(&ctl_mutex); for (idx = 0; idx < MAX_WRITERS; idx++) { pd = pkt_devs[idx]; @@ -2780,7 +2780,7 @@ static void pkt_get_status(struct pkt_ctrl_command *ctrl_cmd) { struct pktcdvd_device *pd; - mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); + mutex_lock(&ctl_mutex); pd = pkt_find_dev_from_minor(ctrl_cmd->dev_index); if (pd) { diff --git a/fs/pipe.c b/fs/pipe.c index 50c8a8596b52..abe171566015 100644 --- a/fs/pipe.c +++ b/fs/pipe.c @@ -78,14 +78,6 @@ static unsigned long pipe_user_pages_soft = PIPE_DEF_BUFFERS * INR_OPEN_CUR; #define cmp_int(l, r) ((l > r) - (l < r)) -#ifdef CONFIG_PROVE_LOCKING -static int pipe_lock_cmp_fn(const struct lockdep_map *a, - const struct lockdep_map *b) -{ - return cmp_int((unsigned long) a, (unsigned long) b); -} -#endif - void pipe_lock(struct pipe_inode_info *pipe) { if (pipe->files) @@ -824,7 +816,7 @@ struct pipe_inode_info *alloc_pipe_info(void) pipe->nr_accounted = pipe_bufs; pipe->user = user; mutex_init(&pipe->mutex); - lock_set_cmp_fn(&pipe->mutex, pipe_lock_cmp_fn, NULL); + lock_set_cmp_fn_ptr_order(&pipe->mutex); return pipe; } diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h index 08b0d1d9d78b..e0b121f96c80 100644 --- a/include/linux/lockdep.h +++ b/include/linux/lockdep.h @@ -391,6 +391,7 @@ extern int lockdep_is_held(const void *); #endif /* !LOCKDEP */ #ifdef CONFIG_PROVE_LOCKING +int lockdep_ptr_order_cmp_fn(const struct lockdep_map *, const struct lockdep_map *); void lockdep_set_lock_cmp_fn(struct lockdep_map *, lock_cmp_fn, lock_print_fn); #define lock_set_cmp_fn(lock, ...) lockdep_set_lock_cmp_fn(&(lock)->dep_map, __VA_ARGS__) @@ -398,6 +399,8 @@ void lockdep_set_lock_cmp_fn(struct lockdep_map *, lock_cmp_fn, lock_print_fn); #define lock_set_cmp_fn(lock, ...) do { } while (0) #endif +#define lock_set_cmp_fn_ptr_order(lock) lock_set_cmp_fn(lock, lockdep_ptr_order_cmp_fn); + enum xhlock_context_t { XHLOCK_HARD, XHLOCK_SOFT, diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index 151bd3de5936..5630be7f5cb2 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -4919,6 +4919,12 @@ struct lock_class_key __lockdep_no_validate__; EXPORT_SYMBOL_GPL(__lockdep_no_validate__); #ifdef CONFIG_PROVE_LOCKING +int lockdep_ptr_order_cmp_fn(const struct lockdep_map *a, + const struct lockdep_map *b) +{ + return cmp_int((unsigned long) a, (unsigned long) b); +} + void lockdep_set_lock_cmp_fn(struct lockdep_map *lock, lock_cmp_fn cmp_fn, lock_print_fn print_fn) {