[Linux-kernel-mentees] [PATCH] checkpatch: add warning for avoiding .L prefix symbols in assembly files

Aditya yashsri421 at gmail.com
Wed Jan 20 12:53:16 UTC 2021


On 20/1/21 2:51 pm, Joe Perches wrote:
> On Wed, 2021-01-20 at 12:55 +0530, Aditya Srivastava wrote:
>> Local symbols prefixed with '.L' do not emit symbol table entries, as
>> they have special meaning for the assembler.
>>
>> '.L' prefixed symbols can be used within a code region, but should be
>> avoided for denoting a range of code via 'SYM_*_START/END' annotations.
>>
>> Add a new check to emit a warning on finding the usage of '.L' symbols
>> in '.S' files, if it lies within SYM_*_START/END annotation pair.
> 
> I believe this needs a test for $file as it won't work well on
> patches as the SYM_*_START/END may not be in the patch context.
> 
Okay.

> Also, is this supposed to work for local labels like '.L<foo>:'?
> I don't think a warning should be generated for those.
> 
Yes, currently it will generate warning for all symbols which start
with .L and have non- white character symbol following it, if it is
lying within SYM_*_START/END annotation pair.

Should I reduce the check to \.L_\S+ instead? (please note "_"
following ".L")
Pardon me, I'm not good with assembly :/

Thanks
Aditya


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