linux-kernel - Re: linux-next: build failure after merge of the mmc tree

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Date:   Fri, 16 Apr 2021 13:49:07 +1000
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: linux-next: build failure after merge of the mmc tree

Hi all,

This is actually just a warning.

On Fri, 16 Apr 2021 13:48:27 +1000 Stephen Rothwell <sfr@...b.auug.org.au> wrote:
>
> Hi all,
> 
> After merging the mmc tree, today's linux-next build (x86_64 allmodconfig)
> failed like this:
> 
> In file included from drivers/memstick/host/r592.h:13,
>                  from drivers/memstick/host/r592.c:21:
> drivers/memstick/host/r592.c: In function 'r592_flush_fifo_write':
> include/linux/kfifo.h:588:1: warning: ignoring return value of '__kfifo_uint_must_check_helper' declared with attribute 'warn_unused_result' [-Wunused-result]
>   588 | __kfifo_uint_must_check_helper( \
>       | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>   589 | ({ \
>       | ~~~~
>   590 |  typeof((fifo) + 1) __tmp = (fifo); \
>       |  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>   591 |  typeof(__tmp->ptr) __buf = (buf); \
>       |  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>   592 |  unsigned long __n = (n); \
>       |  ~~~~~~~~~~~~~~~~~~~~~~~~~~
>   593 |  const size_t __recsize = sizeof(*__tmp->rectype); \
>       |  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>   594 |  struct __kfifo *__kfifo = &__tmp->kfifo; \
>       |  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>   595 |  (__recsize) ?\
>       |  ~~~~~~~~~~~~~~
>   596 |  __kfifo_out_r(__kfifo, __buf, __n, __recsize) : \
>       |  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>   597 |  __kfifo_out(__kfifo, __buf, __n); \
>       |  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>   598 | }) \
>       | ~~~~
>   599 | )
>       | ~
> drivers/memstick/host/r592.c:367:2: note: in expansion of macro 'kfifo_out'
>   367 |  kfifo_out(&dev->pio_fifo, buffer, 4);
>       |  ^~~~~~~~~
> 
> Caused by commit
> 
>   4b00ed3c5072 ("memstick: r592: remove unused variable")

-- 
Cheers,
Stephen Rothwell

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