[lkml]   [2019]   [Jul]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH] Makefile: Globally enable fall-through warning

On 7/28/19 12:14 PM, Guenter Roeck wrote:
> Hi Gustavo,
> On Sun, Jul 28, 2019 at 11:42:28AM -0500, Gustavo A. R. Silva wrote:
>> Hi Guenter,
>> On 7/28/19 8:58 AM, Guenter Roeck wrote:
>>> On Thu, Jun 06, 2019 at 07:46:17PM -0500, Gustavo A. R. Silva wrote:
>>>> Now that all the fall-through warnings have been addressed in the
>>>> kernel, enable the fall-through warning globally.
>>> Not really "all".
>>> powerpc:85xx/sbc8548_defconfig:
>>> arch/powerpc/kernel/align.c: In function ‘emulate_spe’:
>>> arch/powerpc/kernel/align.c:178:8: error: this statement may fall through
>>> Plus many more similar errors in the same file.
>>> All sh builds:
>>> arch/sh/kernel/disassemble.c: In function 'print_sh_insn':
>>> arch/sh/kernel/disassemble.c:478:8: error: this statement may fall through
>>> Again, this is seen in several places.
>>> mips:cavium_octeon_defconfig:
>>> arch/mips/cavium-octeon/octeon-usb.c: In function 'dwc3_octeon_clocks_start':
>>> include/linux/device.h:1499:2: error: this statement may fall through
>>> None of those are from recent changes. And this is just from my small
>>> subset of test builds.
>> Thank you for letting me know about this. I don't have access to build
>> infrastructure like yours.
> I am always happy to run test builds on my infrastructure.

Thank you!

>> My build infrastructure is similar to that of Linus.
>> But if you send me all of those I can create a patch and send it back
>> to you to make sure what you see is addressed. If we can coordinate for
>> this it'd be great for everybody. :)
> Just have a look at the output of,
> in the 'master' and/or 'next' column. There are many additional warnings
> in 'next'. Only downside is that you won't see the warnings unless there
> are also build errors, but -next tends to have lots of those.

I see.

mm... for some reason I'm not able to establish connection with that site...

> Just wondering ... wouldn't it be possible to run a coccinelle script
> to identify those problems automatically, without depending on compile
> warnings ? Or smatch/sparse, maybe ?

That was a common question from people along the whole process. The short
answer is: no. The reason for that is that Coccinelle is not a sophisticated
enough tool to determine if we are dealing with a false positive or an actual

That's why a code audit was needed.


 \ /
  Last update: 2019-07-28 19:33    [W:0.065 / U:8.384 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site