netdev - Re: [PATCH net-next] net: xfrm6: silence sparse warning

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Message-ID: <20140109213022.7e6f8921@nehalam.linuxnetplumber.net>
Date:	Thu, 9 Jan 2014 21:30:22 -0800
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	Ben Hutchings <bhutchings@...arflare.com>
Cc:	David Miller <davem@...emloft.net>, <ying.xue@...driver.com>,
	<steffen.klassert@...unet.com>, <dborkman@...hat.com>,
	<netdev@...r.kernel.org>
Subject: Re: [PATCH net-next] net: xfrm6: silence sparse warning

On Fri, 10 Jan 2014 02:53:06 +0000
Ben Hutchings <bhutchings@...arflare.com> wrote:

> On Thu, 2014-01-09 at 15:04 -0800, Stephen Hemminger wrote:
> > On Wed, 08 Jan 2014 00:56:56 -0500 (EST)
> > David Miller <davem@...emloft.net> wrote:
> > 
> > > From: Ying Xue <ying.xue@...driver.com>
> > > Date: Wed, 8 Jan 2014 13:55:09 +0800
> > > 
> > > > 3. Just drop the patch
> > > 
> > > This is the only suitable thing to do.
> > > --
> > > To unsubscribe from this list: send the line "unsubscribe netdev" in
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> > 
> > There was some patches floating around to eliminate uses of variable
> > length array in the kernel since they aren't supported by CLANG.
> 
> I think you're mixing up two different things there.  VLAs are part of
> C99 so I'm quite sure Clang supports them (in general).  But they seem
> to be deprecated in the kernel anyway, maybe because they make it easy
> to introduce a stack overflow.
> 
> Ben.
> 

Reading up on this, the problem in CLANG is VLA in Structs;
as in:
struct foo {
  char a[n];
  int b;
};
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