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

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Message-ID: <20210416134827.1f35b1cd@canb.auug.org.au>
Date:   Fri, 16 Apr 2021 13:48:27 +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: linux-next: build failure after merge of the mmc tree

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")

Please check the fixes for "simple, robot reported" warnings :-(
-- 
Cheers,
Stephen Rothwell

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