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 > > 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 > :::::: CC: David S. Miller > > --- > 0-DAY CI Kernel Test Service, Intel Corporation > https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTC broadband for 0.8mile line in suburbia: sync at 12.1Mbps down 622kbps up According to speedtest.net: 11.9Mbps down 500kbps up _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel