linux-kernel - Re: [PATCH] compiler*.h: Add '__' prefix and suffix to all __attribute_

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Date:   Tue, 29 Oct 2019 18:54:00 +0000
From:   Ramsay Jones <ramsay@...sayjones.plus.com>
To:     Luc Van Oostenryck <luc.vanoostenryck@...il.com>
Cc:     Joe Perches <joe@...ches.com>,
        Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
        linux-sparse@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH] compiler*.h: Add '__' prefix and suffix to all
 __attribute__ #defines



On 29/10/2019 08:07, Luc Van Oostenryck wrote:
> On Tue, Oct 29, 2019 at 02:38:54AM +0000, Ramsay Jones wrote:
>> On 28/10/2019 23:03, Luc Van Oostenryck wrote:
>>> diff --git a/parse.c b/parse.c
>>> index 4464e2667..4b0a1566c 100644
>>> --- a/parse.c
>>> +++ b/parse.c
>>> @@ -345,6 +345,7 @@ static struct symbol_op goto_op = {
>>>  
>>>  static struct symbol_op __context___op = {
>>>  	.statement = parse_context_statement,
>>> +	.attribute = attribute_context,
>>
>> Hmm, so why is do we have a context_op and a __context___op?
>>
>>>  };
>>>  
>>>  static struct symbol_op range_op = {
>>> @@ -537,6 +538,7 @@ static struct init_keyword {
>>>  	{ "while",	NS_KEYWORD, .op = &while_op },
>>>  	{ "do",		NS_KEYWORD, .op = &do_op },
>>>  	{ "goto",	NS_KEYWORD, .op = &goto_op },
>>> +	{ "context",	NS_KEYWORD, .op = &context_op },
>>>  	{ "__context__",NS_KEYWORD, .op = &__context___op },
>>
>> So, can '__context__' be used in a statement, as well as an
>> attribute, while 'context' can only be used in an attribute?
> 
> Yes, indeed.

OK, so I wasn't quite as confused as I thought! ;-)

> '__context__' was only parsed as a statement and 'context'
> only as an attribute. But now we also want to be able to use
> '__context__' as an attribute (because 'context' is not a
> reserved keyword and can thus be a used defined macro).
> 
> There is no reason, though, we should now also want to use
> 'context' as a statement since it's a sparse extension. Hence
> adding attribute_context to '__context___op' and keeping
> 'context_op' as such (but moving them together).

Thanks for the explanation.

ATB,
Ramsay Jones