linux-kernel - Re: [PATCH 1/1] lib: remove leading spaces before tabs

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Date:   Wed, 9 Jun 2021 13:15:04 +0800
From:   "Leizhen (ThunderTown)" <thunder.leizhen@...wei.com>
To:     Joe Perches <joe@...ches.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>
CC:     Andy Shevchenko <andy@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] lib: remove leading spaces before tabs



On 2021/6/9 0:03, Joe Perches wrote:
> On Tue, 2021-06-08 at 17:00 +0800, Leizhen (ThunderTown) wrote:
>> On 2021/6/8 16:44, Andy Shevchenko wrote:
>>> On Tue, Jun 8, 2021 at 10:14 AM Zhen Lei <thunder.leizhen@...wei.com> wrote:
>>>>
>>>> 1) Run the following command to find and remove the leading spaces before
>>>>    tabs:
>>>>    find lib/ -type f | xargs sed -r -i 's/^[ ]+\t/\t/'
>>>
>>> Hint for the future, try to use what Git provides, for example `git
>>> ls-files -- lib/`.
>>
>> Okay, thanks. I learned a new trick.
> 
> Perhaps another 'trick'.
> 
> checkpatch has SPACE_BEFORE_TAB which does this for any spaces before
> a tab, not just at the start of lines.  But as you've no doubt seen,
> many maintainers do not care for this sort of whitespace only change
> so it's best to do this sparingly or only in drivers/staging/ paths.

I've always thought of kernel, mm, and lib as the core modules of Linux,
and they serve as showcases for successors. I'm not interested in making
coding style improvements unless it's a work-related driver that I
usually read.

> 
> For instance:
> 
> $ git diff --stat lib
> $ git ls-files lib/ | \
>   xargs ./scripts/checkpatch.pl --types=SPACE_BEFORE_TAB --fix-inplace

Wow, It's so powerful. Thanks.

> <checkpatch output>
> $ git diff --stat lib
>  lib/atomic64_test.c             |   2 +-
>  lib/bitmap.c                    |   4 +-
>  lib/btree.c                     |   4 +-
>  lib/decompress_bunzip2.c        |   6 +-
>  lib/fonts/font_mini_4x6.c       | 512 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-------------------------------------------------------------------

This file is horrible. It's hard not to correct it.

>  lib/locking-selftest.c          |  12 ++--
>  lib/lockref.c                   |   2 +-
>  lib/lru_cache.c                 |   2 +-
>  lib/math/rational-test.c        |   2 +-
>  lib/nlattr.c                    |   4 +-
>  lib/raid6/neon.c                |   2 +-
>  lib/raid6/sse2.c                |  12 ++--
>  lib/reed_solomon/reed_solomon.c |   4 +-
>  lib/scatterlist.c               |   4 +-
>  lib/string.c                    |   4 +-
>  lib/test_firmware.c             |   2 +-
>  lib/test_kmod.c                 |   2 +-
>  lib/test_overflow.c             |   2 +-
>  lib/textsearch.c                |   2 +-
>  lib/ts_bm.c                     |   2 +-
>  lib/zlib_deflate/deflate.c      |   2 +-
>  21 files changed, 294 insertions(+), 294 deletions(-)
> 
> 
> 
> .
>