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Date: Fri, 13 Sep 2019 20:18:31 +0000
From: Chaitanya Kulkarni <Chaitanya.Kulkarni@....com>
To: André Almeida <andrealmeid@...labora.com>,
"linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC: "corbet@....net" <corbet@....net>,
"axboe@...nel.dk" <axboe@...nel.dk>,
"kernel@...labora.com" <kernel@...labora.com>,
"krisman@...labora.com" <krisman@...labora.com>
Subject: Re: [PATCH 3/4] null_blk: format pr_* logs with pr_fmt
On 09/13/2019 12:00 PM, André Almeida wrote:
> Instead of writing "null_blk: " at the beginning of each pr_err/info/warn
Please limit above line to 72 character.
> log message, format messages using pr_fmt() macro. Change the order of
> includes to prevent '"pr_fmt" redefined' warning messages.
Why change the order of headers ? Can we use #undef ?
This change of order for block driver looks bit odd as compare to
othe kernel block driver source code.
See :- drivers/scsi, drivers/nvme.
>
> Signed-off-by: André Almeida <andrealmeid@...labora.com>
> ---
> drivers/block/null_blk.h | 4 +++-
> drivers/block/null_blk_main.c | 18 +++++++++---------
> drivers/block/null_blk_zoned.c | 6 +++---
> 3 files changed, 15 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/block/null_blk.h b/drivers/block/null_blk.h
> index a1b9929bd911..2d2183320be2 100644
> --- a/drivers/block/null_blk.h
> +++ b/drivers/block/null_blk.h
> @@ -2,6 +2,8 @@
> #ifndef __BLK_NULL_BLK_H
> #define __BLK_NULL_BLK_H
>
> +#define pr_fmt(fmt) "null_blk: " fmt
Is there a reason why KBUILD_MODNAME is not used here ?
> +
> #include <linux/blkdev.h>
> #include <linux/slab.h>
> #include <linux/blk-mq.h>
> @@ -96,7 +98,7 @@ void null_zone_reset(struct nullb_cmd *cmd, sector_t sector);
> #else
> static inline int null_zone_init(struct nullb_device *dev)
> {
> - pr_err("null_blk: CONFIG_BLK_DEV_ZONED not enabled\n");
> + pr_err("CONFIG_BLK_DEV_ZONED not enabled\n");
> return -EINVAL;
> }
> static inline void null_zone_exit(struct nullb_device *dev) {}
> diff --git a/drivers/block/null_blk_main.c b/drivers/block/null_blk_main.c
> index 5d20d65041bd..081ca55bb0a6 100644
> --- a/drivers/block/null_blk_main.c
> +++ b/drivers/block/null_blk_main.c
> @@ -3,13 +3,13 @@
> * Add configfs and memory store: Kyungchan Koh <kkc6196@...com> and
> * Shaohua Li <shli@...com>
> */
> +#include "null_blk.h"
> #include <linux/module.h>
>
> #include <linux/moduleparam.h>
> #include <linux/sched.h>
> #include <linux/fs.h>
> #include <linux/init.h>
> -#include "null_blk.h"
Unless there is a strong reason we should avoid this change ?
>
> #define PAGE_SECTORS_SHIFT (PAGE_SHIFT - SECTOR_SHIFT)
> #define PAGE_SECTORS (1 << PAGE_SECTORS_SHIFT)
> @@ -1311,7 +1311,7 @@ static bool should_requeue_request(struct request *rq)
>
> static enum blk_eh_timer_return null_timeout_rq(struct request *rq, bool res)
> {
> - pr_info("null_blk: rq %p timed out\n", rq);
> + pr_info("rq %p timed out\n", rq);
> blk_mq_complete_request(rq);
> return BLK_EH_DONE;
> }
> @@ -1739,28 +1739,28 @@ static int __init null_init(void)
> struct nullb_device *dev;
>
> if (g_bs > PAGE_SIZE) {
> - pr_warn("null_blk: invalid block size\n");
> - pr_warn("null_blk: defaults block size to %lu\n", PAGE_SIZE);
> + pr_warn("invalid block size\n");
> + pr_warn("defaults block size to %lu\n", PAGE_SIZE);
> g_bs = PAGE_SIZE;
> }
>
> if (!is_power_of_2(g_zone_size)) {
> - pr_err("null_blk: zone_size must be power-of-two\n");
> + pr_err("zone_size must be power-of-two\n");
> return -EINVAL;
> }
>
> if (g_home_node != NUMA_NO_NODE && g_home_node >= nr_online_nodes) {
> - pr_err("null_blk: invalid home_node value\n");
> + pr_err("invalid home_node value\n");
> g_home_node = NUMA_NO_NODE;
> }
>
> if (g_queue_mode == NULL_Q_RQ) {
> - pr_err("null_blk: legacy IO path no longer available\n");
> + pr_err("legacy IO path no longer available\n");
> return -EINVAL;
> }
> if (g_queue_mode == NULL_Q_MQ && g_use_per_node_hctx) {
> if (g_submit_queues != nr_online_nodes) {
> - pr_warn("null_blk: submit_queues param is set to %u.\n",
> + pr_warn("submit_queues param is set to %u.\n",
> nr_online_nodes);
> g_submit_queues = nr_online_nodes;
> }
> @@ -1803,7 +1803,7 @@ static int __init null_init(void)
> }
> }
>
> - pr_info("null_blk: module loaded\n");
> + pr_info("module loaded\n");
> return 0;
>
> err_dev:
> diff --git a/drivers/block/null_blk_zoned.c b/drivers/block/null_blk_zoned.c
> index cb28d93f2bd1..670f9cf79d80 100644
> --- a/drivers/block/null_blk_zoned.c
> +++ b/drivers/block/null_blk_zoned.c
> @@ -1,6 +1,6 @@
> // SPDX-License-Identifier: GPL-2.0
> -#include <linux/vmalloc.h>
> #include "null_blk.h"
> +#include <linux/vmalloc.h>
Same here.
>
> /* zone_size in MBs to sectors. */
> #define ZONE_SIZE_SHIFT 11
> @@ -17,7 +17,7 @@ int null_zone_init(struct nullb_device *dev)
> unsigned int i;
>
> if (!is_power_of_2(dev->zone_size)) {
> - pr_err("null_blk: zone_size must be power-of-two\n");
> + pr_err("zone_size must be power-of-two\n");
> return -EINVAL;
> }
>
> @@ -31,7 +31,7 @@ int null_zone_init(struct nullb_device *dev)
>
> if (dev->zone_nr_conv >= dev->nr_zones) {
> dev->zone_nr_conv = dev->nr_zones - 1;
> - pr_info("null_blk: changed the number of conventional zones to %u",
> + pr_info("changed the number of conventional zones to %u",
> dev->zone_nr_conv);
> }
>
>
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