linux-kernel - Re: [PATCH] fix flags length in net 9p

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Date:	Thu, 1 May 2008 17:46:57 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Alexey Dobriyan <adobriyan@...il.com>
cc:	Daniel Walker <dwalker@...sta.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, lucho@...kov.net,
	ericvh@...il.com, Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] fix flags length in net 9p

On Fri, 2 May 2008, Alexey Dobriyan wrote:
> >
> > The check that's in -rt for this uses BUILD_BUG_ON(), and it's extremely
> > cryptic when there is a failure .. Most people will be baffled why the
> > build stopped. If a check went into mainline it should at least give you
> > some sort of idea what's happening ..
>
> One comment near BUILD_BUG_ON is enough (and everything we can do).

You might want to put a few comments by spinlock functions too, since I
hit this bug in the -rt patch and it confused my for about 10 minutes. Of
course I first blamed my own work on the spinlocks before I noticed that
the caller was using "int".

But actually, I like the idea of having a irqflags_t type that must be
used.

struct irqflags_s {
	unsigned long flags;
};
typedef struct irqflags_s irqflags_t;

This would force everyone to use this structure, and it would be an easy
script to create to do a the cross the board conversion. The only problems
would be where someone didn't use "flags" as the name, but that can be
fixed as well.

-- Steve

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