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

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Message-ID: <20080501223228.GA17060@martell.zuzino.mipt.ru>
Date:	Fri, 2 May 2008 02:32:28 +0400
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Daniel Walker <dwalker@...sta.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org, lucho@...kov.net, ericvh@...il.com
Subject: Re: [PATCH] fix flags length in net 9p

On Thu, May 01, 2008 at 02:26:00PM -0700, Daniel Walker wrote:
> 
> On Thu, 2008-05-01 at 14:19 -0700, Andrew Morton wrote:
> > On Thu, 1 May 2008 17:08:05 -0400 (EDT)
> > Steven Rostedt <rostedt@...dmis.org> wrote:
> > 
> > > Some files in the net/9p directory uses "int" for flags. This can
> > > cause hard to find bugs on some architectures. This patch converts the
> > > flags to use "long" instead.
> > 
> > gargh.
> > 
> > > This bug was discovered by doing an allyesconfig make on the -rt kernel
> > > where checks are done to ensure all flags are of size sizeof(long).
> > 
> > I was about to suggest that we do something like that...
> > 
> > I wonder how messy it is.  I long ago lost the ability to follow the
> > convolutions in include/linux/spinlock*.h :(  gotta patch?
> 
> 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).

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