[Linux-kernel-mentees] [PATCH] checkpatch: Adjust spelling check false positive

Mrinal Pandey mrinalmni at gmail.com
Tue Jul 14 14:56:46 UTC 2020

On Sat, Jul 11, 2020 at 3:17 AM Lukas Bulwahn <lukas.bulwahn at gmail.com>

> >> For Issue 5: Can you provide me (and the CC: the list) the list of
> >> false positives (the commit hashes) you found for issue 5 on
> >
> >
> > Here are the commit hashes for which the warning is issued:
> > 54505a1e2083
> > 75d75b7a4d54
> > 8084c99b9af6
> > bfdaf029c9c9
> > dfd402a4c4ba
> >
> >> Can you also provide a short rationale/explanation for
> >> each case that you considered a false positive?
> >
> >
> > In each case the `EXPORT_SYMBOL()` is correctly written and the
> variable/function to be exported
> > is also inside the parentheses, still, we get the warning. Please let me
> know if I am wrong here.
> I checked those warnings. Some of the patches are good cases to check if
> we can improve the heuristics on EXPORT_SYMBOL().
> E.g., commit bfdaf029c9c9 ("ia64: turn csum_partial_copy_from_user() into
> csum_and_copy_from_user()") looks sound to me, and checkpatch.pl should
> not really warn about that.
> Mrinal, maybe you can find out why checkpatch.pl believes that this case
> is wrong and needs to be warned about?


Commit `54505a1e2083`, `8084c99b9af6` and `bfdaf029c9c9` have style issues.
The documentation says to use
`EXPORT_SYMBOL()` just after the closing bracket `}` of the function, it is
exporting. In these commits `EXPORT SYMBOL()`
is either defined at a point later or has been defined after leaving a
blank line which is totally unneeded.

However, commits `dfd402a4c4ba` and `75d75b7a4d54` look fine to me and have
one thing in common, the
`EXPORT_SYMBOL()` in these is used inside of a macro. checkpatch shouldn't
warn about these.

I have noticed checkpatch denoting wrong line numbers for certain files for
several commits.
For example, for the above commit
`bfdaf029c9c9`, the following warning is issued:

WARNING: EXPORT_SYMBOL(foo); should immediately follow its function/variable
#74: FILE: arch/ia64/lib/csum_partial_copy.c:122:

but the file arch/ia64/lib/csum_partial_copy.c is only 113 lines long.
Please let me know if you can reproduce this.

Waiting for your insights.
Thank you.

> Lukas
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