linux-kernel - Re: The sheer number of sparse warnings in the kernel

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Date:	Wed, 26 Feb 2014 17:21:00 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Josh Boyer <jwboyer@...oraproject.org>
CC:	Greg KH <gregkh@...uxfoundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: The sheer number of sparse warnings in the kernel

That would be good.

On February 26, 2014 5:19:51 PM PST, Josh Boyer <jwboyer@...oraproject.org> wrote:
>On Wed, Feb 26, 2014 at 6:37 PM, H. Peter Anvin <hpa@...or.com> wrote:
>> On 02/26/2014 03:31 PM, H. Peter Anvin wrote:
>>> On 02/26/2014 03:29 PM, Greg KH wrote:
>>>> On Wed, Feb 26, 2014 at 03:28:59PM -0800, Greg KH wrote:
>>>>> On Wed, Feb 26, 2014 at 02:49:26PM -0800, H. Peter Anvin wrote:
>>>>>> The number of sparse errors in the current kernel is staggering,
>and it
>>>>>> makes sparse a lot less valuable of a tool that it otherwise
>could be.
>>>>>> On a build of x86-64 allyesconfig I'm getting 20,676 sparse
>messages.
>>>>>> Out of those, 12,358 come from linux/err.h.  Given that the
>latter
>>>>>> basically spams *everything*, I can only conclude that almost
>noone uses
>>>>>> sparse unless they have a filter script.
>>>>>
>>>>> What errors are you seeing from err.h?  I don't see those when
>building
>>>>> different subdirectories with sparse (which is how I normally use
>it.)
>>>>>
>>>>> And what version of sparse are you running:
>>>>>     $ sparse --version
>>>>>     v0.4.5-rc1-407-g345e8943fc36
>>>>
>>>> Ah, 0.5.0 is now out, maybe you should update to that version?
>>>>
>>>
>>> Yes... it looks like the 0.4.5-rc1 that shipped in Fedora is indeed
>out
>>> of date.  With 0.5.0 I "only" see 8,207 messages, which means that
>at
>>> least the linux/err.h issue is gone.
>>>
>>
>> For what it's worth, the rpm is called sparse-0.4.5.rc1-2.fc19.x86_64
>> and sparse --version reports 0.4.4...
>
>Fedora rawhide has sparse-0.5.0-1.fc21.  If it matters, we could
>probably update F20 and F19 with that.
>
>josh

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