[+to Jon, +cc Thierry] On Fri, Jun 18, 2021 at 06:34:20PM +0800, kernel test robot wrote: > tree/branch: https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git for-linus > branch HEAD: 15ac366c3d20ce1e08173f1de393a8ce95a1facf PCI: aardvark: Fix kernel panic during PIO transfer > > possible Warning in current branch: > > drivers/pci/controller/dwc/pcie-tegra194.c:1829:23: warning: Shifting signed 32-bit value by 31 bits is undefined behaviour. See condition at line 1826. [shiftTooManyBitsSigned] This looks like a legit warning, but I think the only commit that could be related is this one: https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git/commit/?h=for-linus&id=99ab5996278379a02d5a84c4a7ac33a2ebfdb29e which doesn't touch that code. It does *move* some code, so maybe this was an existing warning that moved enough that the robot thought it was new? Or is this a new compiler version or were more warnings turned on? How can we reproduce this to make sure we fix it? > Warning ids grouped by kconfigs: > > gcc_recent_errors > `-- m68k-randconfig-p001-20210617 > `-- drivers-pci-controller-dwc-pcie-tegra194.c:warning:Shifting-signed-bit-value-by-bits-is-undefined-behaviour.-See-condition-at-line-.-shiftTooManyBitsSigned > > elapsed time: 723m > > configs tested: 127 > configs skipped: 2 > > gcc tested configs: > arm defconfig > arm64 allyesconfig > arm64 defconfig > arm allyesconfig > arm allmodconfig > arm davinci_all_defconfig > sh se7750_defconfig > mips loongson1c_defconfig > arm lpc32xx_defconfig > mips ath79_defconfig > arm lpd270_defconfig > arm64 alldefconfig > arm keystone_defconfig > riscv rv32_defconfig > arm trizeps4_defconfig > sh rts7751r2d1_defconfig > arm omap2plus_defconfig > s390 debug_defconfig > mips mpc30x_defconfig > powerpc bluestone_defconfig > nios2 alldefconfig > powerpc adder875_defconfig > powerpc mpc834x_itxgp_defconfig > arm ep93xx_defconfig > mips loongson1b_defconfig > sh sh03_defconfig > powerpc pseries_defconfig > riscv nommu_k210_sdcard_defconfig > arm pxa910_defconfig > sh lboxre2_defconfig > arm at91_dt_defconfig > arm tct_hammer_defconfig > arm pxa255-idp_defconfig > arm multi_v5_defconfig > sh se7722_defconfig > powerpc klondike_defconfig > powerpc eiger_defconfig > ia64 zx1_defconfig > sh kfr2r09-romimage_defconfig > powerpc pcm030_defconfig > sh r7785rp_defconfig > xtensa smp_lx200_defconfig > m68k sun3x_defconfig > arm cerfcube_defconfig > powerpc tqm8xx_defconfig > m68k q40_defconfig > powerpc mpc834x_mds_defconfig > powerpc ppc44x_defconfig > x86_64 allnoconfig > ia64 allmodconfig > ia64 defconfig > ia64 allyesconfig > m68k allmodconfig > m68k defconfig > m68k allyesconfig > nios2 defconfig > arc allyesconfig > nds32 allnoconfig > nds32 defconfig > nios2 allyesconfig > csky defconfig > alpha defconfig > alpha allyesconfig > xtensa allyesconfig > h8300 allyesconfig > arc defconfig > sh allmodconfig > parisc defconfig > s390 allyesconfig > s390 allmodconfig > parisc allyesconfig > s390 defconfig > i386 allyesconfig > sparc allyesconfig > sparc defconfig > i386 defconfig > mips allyesconfig > mips allmodconfig > powerpc allyesconfig > powerpc allmodconfig > powerpc allnoconfig > i386 randconfig-a002-20210618 > i386 randconfig-a006-20210618 > i386 randconfig-a004-20210618 > i386 randconfig-a001-20210618 > i386 randconfig-a005-20210618 > i386 randconfig-a003-20210618 > x86_64 randconfig-a015-20210618 > x86_64 randconfig-a011-20210618 > x86_64 randconfig-a012-20210618 > x86_64 randconfig-a014-20210618 > x86_64 randconfig-a016-20210618 > x86_64 randconfig-a013-20210618 > i386 randconfig-a015-20210618 > i386 randconfig-a016-20210618 > i386 randconfig-a013-20210618 > i386 randconfig-a014-20210618 > i386 randconfig-a012-20210618 > i386 randconfig-a011-20210618 > i386 randconfig-a015-20210617 > i386 randconfig-a013-20210617 > i386 randconfig-a016-20210617 > i386 randconfig-a012-20210617 > i386 randconfig-a014-20210617 > i386 randconfig-a011-20210617 > riscv nommu_k210_defconfig > riscv allyesconfig > riscv nommu_virt_defconfig > riscv allnoconfig > riscv defconfig > riscv allmodconfig > x86_64 rhel-8.3-kselftests > um x86_64_defconfig > um i386_defconfig > um kunit_defconfig > x86_64 allyesconfig > x86_64 defconfig > x86_64 rhel-8.3 > x86_64 rhel-8.3-kbuiltin > x86_64 kexec > > clang tested configs: > x86_64 randconfig-b001-20210618 > x86_64 randconfig-a002-20210618 > x86_64 randconfig-a001-20210618 > x86_64 randconfig-a004-20210618 > x86_64 randconfig-a003-20210618 > x86_64 randconfig-a006-20210618 > x86_64 randconfig-a005-20210618 > > --- > 0-DAY CI Kernel Test Service, Intel Corporation > https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
