linux-kernel - Re: [PATCH v3 01/17] hashtable: introduce a small and naive hashtable

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Message-ID: <504677C8.3050801@redhat.com>
Date:	Tue, 04 Sep 2012 22:51:04 +0100
From:	Pedro Alves <palves@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Sasha Levin <levinsasha928@...il.com>,
	Tejun Heo <tj@...nel.org>, torvalds@...ux-foundation.org,
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Subject: Re: [PATCH v3 01/17] hashtable: introduce a small and naive hashtable

On 09/04/2012 09:59 PM, Steven Rostedt wrote:
> On Tue, 2012-09-04 at 18:21 +0100, Pedro Alves wrote:
>> On 09/04/2012 06:17 PM, Steven Rostedt wrote:
>>> On Tue, 2012-09-04 at 17:40 +0100, Pedro Alves wrote:
>>>
>>>> BTW, you can also go a step further and remove the need to close with double }},
>>>> with something like:
>>>>
>>>> #define do_for_each_ftrace_rec(pg, rec)                                          \
>>>>         for (pg = ftrace_pages_start, rec = &pg->records[pg->index];             \
>>>>              pg && rec == &pg->records[pg->index];                               \
>>>>              pg = pg->next)                                                      \
>>>>           for (rec = pg->records; rec < &pg->records[pg->index]; rec++)
>>>>
>>>
>>> Yeah, but why bother? It's hidden in a macro, and the extra '{ }' shows
>>> that this is something "special".
>>
>> The point of both changes is that there's nothing special in the end
>> at all.  It all just works...
>>
> 
> It would still fail on a 'break'. The 'while' macro tells us that it is
> special, because in the end, it wont work.

Please explain why it would fail on a 'break'.

-- 
Pedro Alves

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