linux-kernel - Re: [patch 2/6] epoll keyed wakeups v2 - introduce new *

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Message-ID: <alpine.DEB.1.10.0902031011380.23050@alien.or.mcafeemobile.com>
Date:	Tue, 3 Feb 2009 10:24:03 -0800 (PST)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Ingo Molnar <mingo@...e.hu>, David Miller <davem@...emloft.net>
Subject: Re: [patch 2/6] epoll keyed wakeups v2 - introduce new *_poll()
 wakeup macros

On Tue, 3 Feb 2009, Andrew Morton wrote:

> On Sun, 01 Feb 2009 12:04:23 -0800 Davide Libenzi <davidel@...ilserver.org> wrote:
> 
> > +#define wake_up_nested_poll(x, m, s)					\
> > +do {									\
> > +	unsigned long flags;						\
> > +									\
> > +	spin_lock_irqsave_nested(&(x)->lock, flags, (s));		\
> > +	wake_up_locked_poll(x, m);					\
> > +	spin_unlock_irqrestore(&(x)->lock, flags);			\
> > +} while (0)
> 
> I had to go and find the callsite to work out the type of `x' :(
> 
> - this macro can be passed the address of any structure which has a
>   `spinlock_t lock;' in it, which seems strange.
> 
> - It references its first arg three times.
> 
> Is there any reason why we can't implement this in C?  

I don't see any reason why these two couldn't be normal functions (I 
just referenced wake_up_nested(), that was a macro in the first place). 
Probably even un-inlined?



- Davide


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