linux-kernel - Re: [alsa-devel] [PATCH 04/10] ASoC: img: Add driver for I2S output controller

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Date:	Thu, 1 Oct 2015 02:34:35 +0800
From:	kbuild test robot <lkp@...el.com>
To:	Damien Horsley <Damien.Horsley@...tec.com>
Cc:	kbuild-all@...org, alsa-devel@...a-project.org,
	Mark Rutland <mark.rutland@....com>,
	devicetree@...r.kernel.org, Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	linux-kernel@...r.kernel.org, Mark Brown <broonie@...nel.org>,
	Takashi Iwai <tiwai@...e.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	Kumar Gala <galak@...eaurora.org>,
	"Damien.Horsley" <Damien.Horsley@...tec.com>
Subject: Re: [alsa-devel] [PATCH 04/10] ASoC: img: Add driver for I2S output
 controller

Hi Damien.Horsley,

[auto build test results on v4.3-rc3 -- if it's inappropriate base, please ignore]

config: blackfin-allmodconfig (attached as .config)
reproduce:
  wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
  chmod +x ~/bin/make.cross
  git checkout 5037c15dd47c86ab337b73c7f9ffcabe1bb86f3b
  # save the attached .config to linux build tree
  make.cross ARCH=blackfin 

Note: it may well be a FALSE warning. FWIW you are at least aware of it now.
http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings

All warnings (new ones prefixed by >>):

   sound/soc/img/img-i2s-out.c: In function 'img_i2s_out_set_fmt':
>> include/asm-generic/io.h:163:2: warning: 'reg' may be used uninitialized in this function [-Wuninitialized]
   sound/soc/img/img-i2s-out.c:291:6: note: 'reg' was declared here

vim +/reg +163 include/asm-generic/io.h

9216efaf Thierry Reding 2014-10-01  147  	__raw_writeb(value, addr);
3f7e212d Arnd Bergmann  2009-05-13  148  }
9216efaf Thierry Reding 2014-10-01  149  #endif
3f7e212d Arnd Bergmann  2009-05-13  150  
9216efaf Thierry Reding 2014-10-01  151  #ifndef writew
9216efaf Thierry Reding 2014-10-01  152  #define writew writew
9216efaf Thierry Reding 2014-10-01  153  static inline void writew(u16 value, volatile void __iomem *addr)
3f7e212d Arnd Bergmann  2009-05-13  154  {
9216efaf Thierry Reding 2014-10-01  155  	__raw_writew(cpu_to_le16(value), addr);
3f7e212d Arnd Bergmann  2009-05-13  156  }
9216efaf Thierry Reding 2014-10-01  157  #endif
3f7e212d Arnd Bergmann  2009-05-13  158  
9216efaf Thierry Reding 2014-10-01  159  #ifndef writel
9216efaf Thierry Reding 2014-10-01  160  #define writel writel
9216efaf Thierry Reding 2014-10-01  161  static inline void writel(u32 value, volatile void __iomem *addr)
3f7e212d Arnd Bergmann  2009-05-13  162  {
9216efaf Thierry Reding 2014-10-01 @163  	__raw_writel(__cpu_to_le32(value), addr);
3f7e212d Arnd Bergmann  2009-05-13  164  }
9216efaf Thierry Reding 2014-10-01  165  #endif
3f7e212d Arnd Bergmann  2009-05-13  166  
9216efaf Thierry Reding 2014-10-01  167  #ifdef CONFIG_64BIT
9216efaf Thierry Reding 2014-10-01  168  #ifndef writeq
9216efaf Thierry Reding 2014-10-01  169  #define writeq writeq
9216efaf Thierry Reding 2014-10-01  170  static inline void writeq(u64 value, volatile void __iomem *addr)
3f7e212d Arnd Bergmann  2009-05-13  171  {

:::::: The code at line 163 was first introduced by commit
:::::: 9216efafc52ff99e9351ef60de5fcafc2bc8adb6 asm-generic/io.h: Reconcile I/O accessor overrides

:::::: TO: Thierry Reding <treding@...dia.com>
:::::: CC: Thierry Reding <treding@...dia.com>

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