linux-kernel - Re: [PATCH 2/6] typesafe: kthread_create and kthread

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Date:	Sun, 20 Jan 2008 17:24:42 +0100
From:	Johannes Weiner <hannes@...urebad.de>
To:	"Bert Wesarg" <bert.wesarg@...glemail.com>
Cc:	"Jan Engelhardt" <jengelh@...putergmbh.de>,
	"Rusty Russell" <rusty@...tcorp.com.au>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, "Jeff Garzik" <jeff@...zik.org>,
	"Tejun Heo" <htejun@...il.com>
Subject: Re: [PATCH 2/6] typesafe: kthread_create and kthread_run

Hi,

"Bert Wesarg" <bert.wesarg@...glemail.com> writes:

> On Jan 20, 2008 12:25 PM, Jan Engelhardt <jengelh@...putergmbh.de> wrote:
>>
>> On Jan 20 2008 20:48, Rusty Russell wrote:
>> >+ */
>> >+#define kthread_create(threadfn, data, namefmt...) ({         \
>> >+      int (*_threadfn)(typeof(data)) = (threadfn);            \
>> >+      __kthread_create((void *)_threadfn, (data), namefmt);   \
>> >+})
>>
>> If you have namefmt... you need that varagrs cpp trick. IIRC:
>>
>>         __kthread_create((void *)_threadfn, (data), namefmt, __VA_ARGS__);
> almost
>
> either:
>
> #define kthread_create(threadfn, data, ...) ({         \
>         __kthread_create((void *)_threadfn, (data), __VA_ARGS__);
>

No.  This is bad because it gives the impression that it takes only two
essential arguments which is not the case.

> or:
>
> #define kthread_create(threadfn, data, namefmt, ...) ({         \
>         __kthread_create((void *)_threadfn, (data), namefmt, ##__VA_ARGS__);
>

This is better.  I prefer naming the rest args instead of using __VA_ARGS__:

#define kthread_create(threadfn, data, namefmt, fmtargs...) ({ \
	... \
	__kthread_create((void *)_threadfn, (data), namefmt, ##	fmtargs) \
})

but I think that is just a matter of taste.

	Hannes
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