linux-kernel - Re: [patch] lockdep: fix seqlock

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Date:	Tue, 12 Dec 2006 13:06:43 -0800
From:	Andrew Morton <akpm@...l.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Linus Torvalds <torvalds@...l.org>, linux-kernel@...r.kernel.org
Subject: Re: [patch] lockdep: fix seqlock_init()

On Tue, 12 Dec 2006 21:50:01 +0100
Ingo Molnar <mingo@...e.hu> wrote:

> 
> * Andrew Morton <akpm@...l.org> wrote:
> 
> > On Tue, 12 Dec 2006 12:10:28 +0100
> > Ingo Molnar <mingo@...e.hu> wrote:
> > 
> > > +#define seqlock_init(x)					\
> > > +	do {						\
> > > +		(x)->sequence = 0;			\
> > > +		spin_lock_init(&(x)->lock);		\
> > > +	} while (0)
> > 
> > This does not have to be a macro, does it?
> 
> Maybe it could be an __always_inline inline function (it has to be 
> inlined to get the callsite based lock class key right)

the compiler darn better inline it, else we'll have an out-of-line copy of
everything in everywhere.

> - but i'm not 
> sure about the include file dependencies. Will probably work out fine as 
> seqlock.h is supposed to be a late one in the order of inclusion - but i 
> didnt want to make a blind bet.

seqlock.h already includes spinlock.h.
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