Hi Arnd, [auto build test WARNING on wsa/i2c/for-next] [also build test WARNING on next-20151210] [cannot apply to v4.4-rc4] url: https://github.com/0day-ci/linux/commits/Arnd-Bergmann/i2c-allow-building-emev2-without-slave-mode-again/20151210-211642 base: https://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux i2c/for-next config: x86_64-randconfig-r0-12102217 (attached as .config) reproduce: # save the attached .config to linux build tree make ARCH=x86_64 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/x86/include/asm/realmode.h:5:0, from arch/x86/include/asm/acpi.h:33, from arch/x86/include/asm/fixmap.h:19, from arch/x86/include/asm/apic.h:12, from arch/x86/include/asm/smp.h:12, from arch/x86/include/asm/mmzone_64.h:10, from arch/x86/include/asm/mmzone.h:4, from include/linux/mmzone.h:856, from include/linux/gfp.h:5, from include/linux/device.h:29, from drivers/i2c/busses/i2c-emev2.c:15: drivers/i2c/busses/i2c-emev2.c: In function 'em_i2c_irq_handler': >> arch/x86/include/asm/io.h:53:3: warning: 'value' may be used uninitialized in this function [-Wmaybe-uninitialized] { asm volatile("mov" size " %0,%1": :reg (val), \ ^ drivers/i2c/busses/i2c-emev2.c:232:13: note: 'value' was declared here u8 status, value; ^ vim +/value +53 arch/x86/include/asm/io.h b310f381d include/asm-x86/io.h venkatesh.pallipadi@xxxxxxxxx 2008-03-18 37 #define ARCH_HAS_IOREMAP_WC d838270e2 arch/x86/include/asm/io.h Toshi Kani 2015-06-04 38 #define ARCH_HAS_IOREMAP_WT b310f381d include/asm-x86/io.h venkatesh.pallipadi@xxxxxxxxx 2008-03-18 39 1c5b9069e arch/x86/include/asm/io.h Brian Gerst 2010-02-05 40 #include <linux/string.h> c1f64a580 include/asm-x86/io.h Linus Torvalds 2008-05-27 41 #include <linux/compiler.h> 976e8f677 arch/x86/include/asm/io.h Jeremy Fitzhardinge 2009-02-06 42 #include <asm/page.h> 5b7c73e00 arch/x86/include/asm/io.h Mark Salter 2014-04-07 43 #include <asm/early_ioremap.h> d6472302f arch/x86/include/asm/io.h Stephen Rothwell 2015-06-02 44 #include <asm/pgtable_types.h> c1f64a580 include/asm-x86/io.h Linus Torvalds 2008-05-27 45 c1f64a580 include/asm-x86/io.h Linus Torvalds 2008-05-27 46 #define build_mmio_read(name, size, type, reg, barrier) \ c1f64a580 include/asm-x86/io.h Linus Torvalds 2008-05-27 47 static inline type name(const volatile void __iomem *addr) \ 1c5b0eb66 include/asm-x86/io.h Mikael Pettersson 2008-08-13 48 { type ret; asm volatile("mov" size " %1,%0":reg (ret) \ c1f64a580 include/asm-x86/io.h Linus Torvalds 2008-05-27 49 :"m" (*(volatile type __force *)addr) barrier); return ret; } c1f64a580 include/asm-x86/io.h Linus Torvalds 2008-05-27 50 c1f64a580 include/asm-x86/io.h Linus Torvalds 2008-05-27 51 #define build_mmio_write(name, size, type, reg, barrier) \ c1f64a580 include/asm-x86/io.h Linus Torvalds 2008-05-27 52 static inline void name(type val, volatile void __iomem *addr) \ c1f64a580 include/asm-x86/io.h Linus Torvalds 2008-05-27 @53 { asm volatile("mov" size " %0,%1": :reg (val), \ c1f64a580 include/asm-x86/io.h Linus Torvalds 2008-05-27 54 "m" (*(volatile type __force *)addr) barrier); } c1f64a580 include/asm-x86/io.h Linus Torvalds 2008-05-27 55 1c5b0eb66 include/asm-x86/io.h Mikael Pettersson 2008-08-13 56 build_mmio_read(readb, "b", unsigned char, "=q", :"memory") 1c5b0eb66 include/asm-x86/io.h Mikael Pettersson 2008-08-13 57 build_mmio_read(readw, "w", unsigned short, "=r", :"memory") 1c5b0eb66 include/asm-x86/io.h Mikael Pettersson 2008-08-13 58 build_mmio_read(readl, "l", unsigned int, "=r", :"memory") c1f64a580 include/asm-x86/io.h Linus Torvalds 2008-05-27 59 1c5b0eb66 include/asm-x86/io.h Mikael Pettersson 2008-08-13 60 build_mmio_read(__readb, "b", unsigned char, "=q", ) 1c5b0eb66 include/asm-x86/io.h Mikael Pettersson 2008-08-13 61 build_mmio_read(__readw, "w", unsigned short, "=r", ) :::::: The code at line 53 was first introduced by commit :::::: c1f64a58003fd2efaa725a857e269a15f765791a x86: MMIO and gcc re-ordering issue :::::: TO: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> :::::: CC: Ingo Molnar <mingo@xxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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