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

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Date:	Tue, 3 Feb 2009 11:20:46 -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, Davide Libenzi wrote:

> 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). 

Actually reading the comments helps :) It triggers an include-hell, if you 
make them inline. Since they're lockdep debug thingies, I think it's kinda 
wasted turn them into non-inline real functions, so they'd better remain 
macros IMO.



- Davide


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