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Subject: Re: block: remove unused header includes.
To:     "Ma, Jianpeng" <jianpeng.ma@intel.com>,
        Christoph Hellwig <hch@infradead.org>
Cc:     "axboe@kernel.dk" <axboe@kernel.dk>,
        "Williams, Dan J" <dan.j.williams@intel.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
References: <6AA21C22F0A5DA478922644AD2EC308C73C55940@SHSMSX101.ccr.corp.intel.com>
From:   Randy Dunlap <rdunlap@infradead.org>
Message-ID: <768e4398-1789-8dfa-5883-effb566b2f31@infradead.org>
Date:   Sun, 26 Apr 2020 20:06:17 -0700
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Hi,

On 4/26/20 7:56 PM, Ma, Jianpeng wrote:
> This used deheader(git@gitlab.com:esr/deheader.git) to produce.
> 
> Signed-off-by: Jianpeng Ma <jianpeng.ma@intel.com>
> ---
>  block/badblocks.c        |  6 ------
>  block/bfq-cgroup.c       | 10 ----------
>  block/bfq-iosched.c      | 13 -------------
>  block/bio-integrity.c    |  6 ------
>  block/bio.c              | 14 --------------
>  block/blk-cgroup.c       | 10 ----------
>  block/blk-core.c         | 24 ------------------------
>  block/blk-exec.c         |  5 -----
>  block/blk-flush.c        | 10 ----------
>  block/blk-integrity.c    |  6 ------
>  block/blk-ioc.c          |  7 -------
>  block/blk-lib.c          |  5 -----
>  block/blk-map.c          |  4 ----
>  block/blk-merge.c        |  5 -----
>  block/blk-mq-cpumap.c    |  8 --------
>  block/blk-mq-debugfs.c   |  6 ------
>  block/blk-mq-pci.c       |  4 ----
>  block/blk-mq-rdma.c      |  1 -
>  block/blk-mq-sched.c     |  7 -------
>  block/blk-mq-sysfs.c     | 15 +--------------
>  block/blk-mq-tag.c       |  5 -----
>  block/blk-mq-virtio.c    |  4 ----
>  block/blk-mq.c           | 22 ----------------------
>  block/blk-pm.c           |  4 ----
>  block/blk-settings.c     |  8 --------
>  block/blk-softirq.c      |  6 ------
>  block/blk-stat.c         |  5 -----
>  block/blk-sysfs.c        |  9 ---------
>  block/blk-throttle.c     |  5 -----
>  block/blk-timeout.c      |  5 -----
>  block/blk-wbt.c          |  6 ------
>  block/blk-zoned.c        |  7 -------
>  block/bounce.c           | 15 ---------------
>  block/bsg-lib.c          |  5 -----
>  block/bsg.c              | 11 -----------
>  block/cmdline-parser.c   |  1 -
>  block/elevator.c         | 15 ---------------
>  block/genhd.c            | 14 --------------
>  block/ioctl.c            |  8 --------
>  block/ioprio.c           | 11 -----------
>  block/kyber-iosched.c    |  9 ---------
>  block/mq-deadline.c      | 14 --------------
>  block/partitions/amiga.c |  1 -
>  block/partitions/core.c  |  4 ----
>  block/partitions/efi.c   |  3 ---
>  block/partitions/karma.c |  1 -
>  block/partitions/ldm.c   |  4 ----
>  block/partitions/mac.c   |  1 -
>  block/scsi_ioctl.c       | 14 --------------
>  block/sed-opal.c         |  9 ---------
>  block/t10-pi.c           |  1 -
>  fs/block_dev.c           | 16 ----------------
>  52 files changed, 1 insertion(+), 408 deletions(-)
> 
> diff --git a/block/badblocks.c b/block/badblocks.c
> index 2e5f5697db35..4e4eb0fc9eb9 100644
> --- a/block/badblocks.c
> +++ b/block/badblocks.c
> @@ -8,12 +8,6 @@
>   */
>  
>  #include <linux/badblocks.h>
> -#include <linux/seqlock.h>

above is used by:
	seq = read_seqbegin(&bb->lock);

> -#include <linux/device.h>

	struct device is used in this source file.

> -#include <linux/kernel.h>
> -#include <linux/module.h>
> -#include <linux/stddef.h>

	NULL is used in this source file.

> -#include <linux/types.h>

	sector_t is used in this source file.

>  #include <linux/slab.h>
>  
>  /**


Can you explain the criteria that 'deheader' use to decide that
a header file can be removed?

And are you aware of rule #1 in Documentation/process/submit-checklist.rst:

1) If you use a facility then #include the file that defines/declares
   that facility.  Don't depend on other header files pulling in ones
   that you use.


-- 
~Randy