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Date: Sun, 17 Nov 2013 18:15:32 -0800 From: Joe Perches <joe@...ches.com> To: Greg Price <price@....EDU> Cc: Al Viro <viro@...IV.linux.org.uk>, Christopher Li <sparse@...isli.org>, Erico Nunes <nunes.erico@...il.com>, linux-sparse@...r.kernel.org, dwmw2 <dwmw2@...radead.org>, linux-mtd <linux-mtd@...ts.infradead.org>, linux-kernel <linux-kernel@...r.kernel.org> Subject: Re: [PATCH] Clarify error on directive in macro arguments (Re: [PATCH] jffs2: fix sparse errors: directive in argument list) On Sun, 2013-11-17 at 21:07 -0500, Greg Price wrote: > [+linux-sparse and Chris] > > On Mon, Nov 18, 2013 at 01:33:49AM +0000, Al Viro wrote: > > On Sun, Nov 17, 2013 at 02:45:05PM -0800, Joe Perches wrote: > > > Yes. I think it's a defect in how sparse > > > treats string concatenation. > > > > > > That style [... with printk ...] is pretty common in the kernel sources. > > > > ... and it's perfectly fine, until somebody starts playing in nasal > > daemon country and do that in *macro* arguments. And a nasal daemon > > country it is - it's an undefined behaviour. See 6.10.3p11 in C99. > > And trying to define a semantics for that gets real ugly real fast. > > sparse matches gcc behaviour (I hope), but it warns about such abuses. > > It's a defect, all right - one being reported by sparse. > > Perhaps the following tweak to the error message would make this > subtlety clearer? Maybe, but this case isn't a macro. It's a function. Dunno if differentiating when it's a macro or a function is difficult though. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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