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Date: Sat, 4 Apr 2015 19:21:51 +0200 (CEST) From: Julia Lawall <julia.lawall@...6.fr> To: Dan Carpenter <dan.carpenter@...cle.com> cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, devel@...verdev.osuosl.org, kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH 2/2] staging: emxx_udc: test returned value On Sat, 4 Apr 2015, Dan Carpenter wrote: > On Sat, Apr 04, 2015 at 06:20:53PM +0200, Julia Lawall wrote: > > Couldn't one say: > > > > x = NULL; > > y = &x->whatever; > > z = container_of(y, struct blah, whatever); > > > > and end up with z being NULL? > > That is crazy person code. It looks deliberately wrong. If we start > merging deliberate mistakes then we're already screwed. > > I have a smatch check which warns on container_of() but I should update > it to not complain if it's the first struct member. I have looked at > quite a few of these warnings and I worry that there are some places > where it relies on container_of() to be a no-op... That's also crazy > but it's the kind of crazy that people do in real life. :P OK. Should I update the patch to remove the test? I find 57 NULL tests on the result of container_of in the kernel as a whole. julia -- 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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