linux-kernel - Re: [PATCH] irqchip/stm32-exti: map direct event to irq parent

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Date:   Fri, 10 Jul 2020 11:37:47 +0200
From:   Alexandre Torgue <alexandre.torgue@...com>
To:     Marc Zyngier <maz@...nel.org>, kernel test robot <lkp@...el.com>
CC:     Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>, <kbuild-all@...ts.01.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-gpio@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>, <marex@...x.de>
Subject: Re: [PATCH] irqchip/stm32-exti: map direct event to irq parent

Hi Marc,

On 7/10/20 11:31 AM, Marc Zyngier wrote:
> Alexandre,
> 
> On Wed, 08 Jul 2020 05:57:24 +0100,
> kernel test robot <lkp@...el.com> wrote:
>>
>> [1  <text/plain; us-ascii (7bit)>]
>> Hi Alexandre,
>>
>> I love your patch! Perhaps something to improve:
>>
>> [auto build test WARNING on stm32/stm32-next]
>> [also build test WARNING on soc/for-next v5.8-rc4 next-20200707]
>> [If your patch is applied to the wrong git tree, kindly drop us a note.
>> And when submitting patch, we suggest to use  as documented in
>> https://git-scm.com/docs/git-format-patch]
>>
>> url:    https://github.com/0day-ci/linux/commits/Alexandre-Torgue/irqchip-stm32-exti-map-direct-event-to-irq-parent/20200706-161327
>> base:   https://git.kernel.org/pub/scm/linux/kernel/git/atorgue/stm32.git stm32-next
>> config: arm-randconfig-s031-20200707 (attached as .config)
>> compiler: arm-linux-gnueabi-gcc (GCC) 9.3.0
>> reproduce:
>>          wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>>          chmod +x ~/bin/make.cross
>>          # apt-get install sparse
>>          # sparse version: v0.6.2-31-gabbfd661-dirty
>>          # save the attached .config to linux build tree
>>          COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=arm
>>
>> If you fix the issue, kindly add following tag as appropriate
>> Reported-by: kernel test robot <lkp@...el.com>
>>
>> All warnings (new ones prefixed by >>):
>>
>>     In file included from include/linux/build_bug.h:5,
>>                      from include/linux/bits.h:23,
>>                      from include/linux/bitops.h:5,
>>                      from drivers/irqchip/irq-stm32-exti.c:8:
>>     drivers/irqchip/irq-stm32-exti.c: In function 'stm32_exti_h_domain_alloc':
>>     drivers/irqchip/irq-stm32-exti.c:683:23: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits]
>>       683 |  if (desc->irq_parent >= 0) {
>>           |                       ^~
>>     include/linux/compiler.h:58:52: note: in definition of macro '__trace_if_var'
>>        58 | #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
>>           |                                                    ^~~~
>>>> drivers/irqchip/irq-stm32-exti.c:683:2: note: in expansion of macro 'if'
>>       683 |  if (desc->irq_parent >= 0) {
> 
> Do you plan to address this? Looks like an actual bug to me.

I'll fix it in v2, I was just waiting for other comments before sending 
a v2. Do you prefer I send a v2 with this fix, and you'll do your review 
on this v2 ?

regards
alex

> 
> 	M.
>