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From: Russell King - ARM Linux admin <linux@armlinux.org.uk>
To: kbuild test robot <lkp@intel.com>
Cc: kbuild-all@lists.01.org, Peng Ma <peng.ma@nxp.com>,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [arm:cex7 96/112] arch/sparc/include/asm/io_64.h:179:2: warning: 'px_is' may be used uninitialized in this function
Date: Tue, 3 Mar 2020 14:46:58 +0000	[thread overview]
Message-ID: <20200303144658.GN25745@shell.armlinux.org.uk> (raw)
In-Reply-To: <202003032214.pjEWVErC%lkp@intel.com>

This looks to me like a false positive.

On Tue, Mar 03, 2020 at 10:12:28PM +0800, kbuild test robot wrote:
> tree:   git://git.armlinux.org.uk/~rmk/linux-arm.git cex7
> head:   c333ba58ac979daa84d7ea59b7d4a04c15cce2e7
> commit: d45ed9abba2dce5bb6faeb3474264ba64ef2d610 [96/112] ahci: qoriq: workaround for errata A-379364 on lx2160a
> config: sparc64-randconfig-a001-20200303 (attached as .config)
> compiler: sparc64-linux-gcc (GCC) 7.5.0
> reproduce:
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         git checkout d45ed9abba2dce5bb6faeb3474264ba64ef2d610
>         # save the attached .config to linux build tree
>         GCC_VERSION=7.5.0 make.cross ARCH=sparc64 
> 
> If you fix the issue, kindly add following tag
> Reported-by: kbuild test robot <lkp@intel.com>
> 
> 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 >>):
> 
>    In file included from arch/sparc/include/asm/io.h:5:0,
>                     from include/linux/io.h:13,
>                     from include/linux/of_address.h:7,
>                     from drivers//ata/ahci_qoriq.c:14:
>    drivers//ata/ahci_qoriq.c: In function 'ahci_qoriq_hardreset':
> >> arch/sparc/include/asm/io_64.h:179:2: warning: 'px_is' may be used uninitialized in this function [-Wmaybe-uninitialized]
>      __asm__ __volatile__("stwa\t%r0, [%1] %2\t/* pci_writel */"
>      ^~~~~~~
>    drivers//ata/ahci_qoriq.c:229:14: note: 'px_is' was declared here
>      u32 px_cmd, px_is, px_val;
>                  ^~~~~
>    In file included from arch/sparc/include/asm/io.h:5:0,
>                     from include/linux/io.h:13,
>                     from include/linux/of_address.h:7,
>                     from drivers//ata/ahci_qoriq.c:14:
> >> arch/sparc/include/asm/io_64.h:179:2: warning: 'px_cmd' may be used uninitialized in this function [-Wmaybe-uninitialized]
>      __asm__ __volatile__("stwa\t%r0, [%1] %2\t/* pci_writel */"
>      ^~~~~~~
>    drivers//ata/ahci_qoriq.c:229:6: note: 'px_cmd' was declared here
>      u32 px_cmd, px_is, px_val;
>          ^~~~~~
> --
>    In file included from arch/sparc/include/asm/io.h:5:0,
>                     from include/linux/io.h:13,
>                     from include/linux/of_address.h:7,
>                     from drivers/ata/ahci_qoriq.c:14:
>    drivers/ata/ahci_qoriq.c: In function 'ahci_qoriq_hardreset':
> >> arch/sparc/include/asm/io_64.h:179:2: warning: 'px_is' may be used uninitialized in this function [-Wmaybe-uninitialized]
>      __asm__ __volatile__("stwa\t%r0, [%1] %2\t/* pci_writel */"
>      ^~~~~~~
>    drivers/ata/ahci_qoriq.c:229:14: note: 'px_is' was declared here
>      u32 px_cmd, px_is, px_val;
>                  ^~~~~
>    In file included from arch/sparc/include/asm/io.h:5:0,
>                     from include/linux/io.h:13,
>                     from include/linux/of_address.h:7,
>                     from drivers/ata/ahci_qoriq.c:14:
> >> arch/sparc/include/asm/io_64.h:179:2: warning: 'px_cmd' may be used uninitialized in this function [-Wmaybe-uninitialized]
>      __asm__ __volatile__("stwa\t%r0, [%1] %2\t/* pci_writel */"
>      ^~~~~~~
>    drivers/ata/ahci_qoriq.c:229:6: note: 'px_cmd' was declared here
>      u32 px_cmd, px_is, px_val;
>          ^~~~~~
> 
> vim +/px_is +179 arch/sparc/include/asm/io_64.h
> 
> f5e706ad886b6a include/asm-sparc/io_64.h      Sam Ravnborg  2008-07-17  174  
> 79294d7eff89f6 arch/sparc/include/asm/io_64.h Sam Ravnborg  2014-07-20  175  #define writel writel
> 7c3969c3a4f359 arch/sparc/include/asm/io_64.h Arnd Bergmann 2014-11-19  176  #define writel_relaxed writel
> 79294d7eff89f6 arch/sparc/include/asm/io_64.h Sam Ravnborg  2014-07-20  177  static inline void writel(u32 l, volatile void __iomem *addr)
> f5e706ad886b6a include/asm-sparc/io_64.h      Sam Ravnborg  2008-07-17  178  {
> f5e706ad886b6a include/asm-sparc/io_64.h      Sam Ravnborg  2008-07-17 @179  	__asm__ __volatile__("stwa\t%r0, [%1] %2\t/* pci_writel */"
> f5e706ad886b6a include/asm-sparc/io_64.h      Sam Ravnborg  2008-07-17  180  			     : /* no outputs */
> f5e706ad886b6a include/asm-sparc/io_64.h      Sam Ravnborg  2008-07-17  181  			     : "Jr" (l), "r" (addr), "i" (ASI_PHYS_BYPASS_EC_E_L)
> f5e706ad886b6a include/asm-sparc/io_64.h      Sam Ravnborg  2008-07-17  182  			     : "memory");
> f5e706ad886b6a include/asm-sparc/io_64.h      Sam Ravnborg  2008-07-17  183  }
> f5e706ad886b6a include/asm-sparc/io_64.h      Sam Ravnborg  2008-07-17  184  
> 
> :::::: The code at line 179 was first introduced by commit
> :::::: f5e706ad886b6a5eb59637830110b09ccebf01c5 sparc: join the remaining header files
> 
> :::::: TO: Sam Ravnborg <sam@ravnborg.org>
> :::::: CC: David S. Miller <davem@davemloft.net>
> 
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org



-- 
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      reply	other threads:[~2020-03-03 14:47 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-03 14:12 [arm:cex7 96/112] arch/sparc/include/asm/io_64.h:179:2: warning: 'px_is' may be used uninitialized in this function kbuild test robot
2020-03-03 14:46 ` Russell King - ARM Linux admin [this message]

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