linux-kernel - Re: [PATCH -next v4] bcache: Use DEFINE

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Message-ID: <8a60b85c-b4c3-5b4c-af1f-877980800ba7@suse.de>
Date:   Thu, 6 May 2021 11:27:03 +0800
From:   Coly Li <colyli@...e.de>
To:     Zheng Yongjun <zhengyongjun3@...wei.com>
Cc:     Hulk Robot <hulkci@...wei.com>, kent.overstreet@...il.com,
        linux-bcache@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next v4] bcache: Use DEFINE_MUTEX() for mutex lock

On 5/5/21 7:06 PM, Zheng Yongjun wrote:
> Mutex lock can be initialized automatically with DEFINE_MUTEX() rather
> than explicitly calling mutex_init().
> 
> This patch will reduce the size of bcache.ko about 16 bytes, the
> reason as follows:
> 
> Though this patch will increase the size of .data segment about 32
> bytes, it will also reduce the size of .init.text and
> .rodata.str1.1(at x86_64), .rodata_str1.8(at arm64) total about 48
> bytes which reduce the size more than .data segment;
> 
> Here is the statistics:
> Sections: (arm64 platform)
> Idx name                size
> -.init.text             00000240
> +.init.text             00000228
> 
> -.rodata.str1.8	000012cd
> +.rodata.str1.8	000012b5
> 
> -.data                  00000c60
> +.data                  00000c80
> 
> Sections: (x86 platform)
> Idx name                size
> -.init.text             000001d9
> +.init.text             000001bf
> 
> -.rodata.str1.1	00000c80
> +.rodata.str1.1	00000c6d
> 
> -.data                  00000cc0
> +.data                  00000ce0
> 
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Signed-off-by: Zheng Yongjun <zhengyongjun3@...wei.com>

Added in my for-test queue.

Thanks.

Coly Li

[snipped]