linux-kernel - Re: [PATCH] docs: Introduce deprecated APIs list

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Date:   Wed, 17 Oct 2018 10:08:55 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Jani Nikula <jani.nikula@...ux.intel.com>,
        Kees Cook <keescook@...omium.org>,
        Jonathan Corbet <corbet@....net>
Cc:     linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [PATCH] docs: Introduce deprecated APIs list

On 10/17/18 3:00 AM, Jani Nikula wrote:
> On Tue, 16 Oct 2018, Randy Dunlap <rdunlap@...radead.org> wrote:
>> On 10/16/18 7:17 PM, Kees Cook wrote:
>>> As discussed in the "API replacement/deprecation" thread[1], this
>>> makes an effort to document what things shouldn't get (re)added to the
>>> kernel, by introducing Documentation/process/deprecated.rst. It also
>>> adds the overflow kerndoc to ReST output, and tweaks the struct_size()
>>> documentation to parse correctly.
>>>
>>> [1] https://lists.linuxfoundation.org/pipermail/ksummit-discuss/2018-September/005282.html
>>>
>>> Signed-off-by: Kees Cook <keescook@...omium.org>
>>> ---
>>>  Documentation/driver-api/basics.rst  |  3 +
>>>  Documentation/process/deprecated.rst | 99 ++++++++++++++++++++++++++++
>>>  Documentation/process/index.rst      |  1 +
>>>  include/linux/overflow.h             |  2 +-
>>>  4 files changed, 104 insertions(+), 1 deletion(-)
>>>  create mode 100644 Documentation/process/deprecated.rst
>>
>>
>>> diff --git a/include/linux/overflow.h b/include/linux/overflow.h
>>> index 40b48e2133cb..2f224f43dd06 100644
>>> --- a/include/linux/overflow.h
>>> +++ b/include/linux/overflow.h
>>> @@ -291,7 +291,7 @@ static inline __must_check size_t __ab_c_size(size_t n, size_t size, size_t c)
>>>  }
>>>  
>>>  /**
>>> - * struct_size() - Calculate size of structure with trailing array.
>>> + * function struct_size() - Calculate size of structure with trailing array.
>>
>> That syntax is not explained nor documented in Documentation/doc-guide/kernel-doc.rst.
>>
>> Is the root problem that the function name begins with "struct"?
>> Please explain in the patch description.
> 
> Indeed, shouldn't be needed.
> 
> BR,
> Jani.
> 
>>
>>>   * @p: Pointer to the structure.
>>>   * @member: Name of the array member.
>>>   * @n: Number of elements in the array.
>>
>>
>> thanks.


Well, this is just a guess (no testing), but in scripts/kernel-doc (at line
1907 in 4.19-rc8), we can see:

	if ($identifier =~ m/^struct/) {
	    $decl_type = 'struct';
	} elsif ($identifier =~ m/^union/) {
	    $decl_type = 'union';
	} elsif ($identifier =~ m/^enum/) {
	    $decl_type = 'enum';
	} elsif ($identifier =~ m/^typedef/) {
	    $decl_type = 'typedef';
	} else {
	    $decl_type = 'function';
	}

I wouldn't be surprised if a function named "struct_size" looks like a
type struct.  Maybe it needs to be more strict, with either a space or
word boundary at the end of each type string.  E.g.:

	if ($identifier =~ m/^struct\b/) {
	    $decl_type = 'struct';
	} elsif ($identifier =~ m/^union\b/) {
	    $decl_type = 'union';
	} elsif ($identifier =~ m/^enum\b/) {
	    $decl_type = 'enum';
	} elsif ($identifier =~ m/^typedef\b/) {
	    $decl_type = 'typedef';
	} else {
	    $decl_type = 'function';
	}



-- 
~Randy