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 <redacted>
Signed-off-by: Zheng Yongjun <redacted>

Added in my for-test queue.

Thanks.

Coly Li

[snipped]