Re: [paulmck-rcu:dev.2023.04.26a] BUILD REGRESSION 56b38a90a12f76e463a7381d8cff854926fa2b59

From: Paul E. McKenney
Date: Thu Apr 27 2023 - 12:48:12 EST

On Fri, Apr 28, 2023 at 12:28:05AM +0800, kernel test robot wrote:
> tree/branch: https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2023.04.26a
> branch HEAD: 56b38a90a12f76e463a7381d8cff854926fa2b59 rcu-tasks: Stop rcu_tasks_invoke_cbs() from using never-onlined CPUs
>
> Error/Warning reports:
>
> https://lore.kernel.org/oe-kbuild-all/202304271412.cbmTIpbf-lkp@xxxxxxxxx
> https://lore.kernel.org/oe-kbuild-all/202304271416.DjRKPeoJ-lkp@xxxxxxxxx
> https://lore.kernel.org/oe-kbuild-all/202304271446.dk8ruOnO-lkp@xxxxxxxxx
> https://lore.kernel.org/oe-kbuild-all/202304271448.5uG6ip4V-lkp@xxxxxxxxx
> https://lore.kernel.org/oe-kbuild-all/202304271836.Rr0pBtSE-lkp@xxxxxxxxx
>
> Error/Warning: (recently discovered and may have been fixed)
>
> arch/arm/kernel/smp.c:385:1: warning: function declared 'noreturn' should not return [-Winvalid-noreturn]
> arch/loongarch/kernel/process.c:68:1: warning: 'noreturn' function does return
> arch/powerpc/kernel/smp.c:1768:1: error: function declared 'noreturn' should not return [-Werror,-Winvalid-noreturn]
> arch/x86/kernel/nmi.c:441:6: warning: no previous prototype for 'set_nmi_torture' [-Wmissing-prototypes]
> arch/x86/kernel/nmi.c:441:6: warning: no previous prototype for function 'set_nmi_torture' [-Wmissing-prototypes]

These appear to be from some other commits, some of which are admittedly
my debug commits.

> Unverified Error/Warning (likely false positive, please contact us if interested):
>
> kernel/rcu/tree.c:2149 rcu_do_batch() error: uninitialized symbol 'jlimit'.

This is a false positive, as discussed recently with Dan Carpenter:

https://lore.kernel.org/all/90f95e84-842c-4273-90a3-93afd5353fd2@kili.mountain/

Thanx, Paul

> Error/Warning ids grouped by kconfigs:
>
> gcc_recent_errors
> |-- i386-randconfig-a001
> | `-- arch-x86-kernel-nmi.c:warning:no-previous-prototype-for-set_nmi_torture
> |-- i386-randconfig-c001
> | `-- arch-x86-kernel-nmi.c:warning:no-previous-prototype-for-set_nmi_torture
> |-- i386-randconfig-m021
> | |-- arch-x86-kernel-nmi.c:warning:no-previous-prototype-for-set_nmi_torture
> | `-- kernel-rcu-tree.c-rcu_do_batch()-error:uninitialized-symbol-jlimit-.
> |-- loongarch-randconfig-r012-20230427
> | `-- arch-loongarch-kernel-process.c:warning:noreturn-function-does-return
> |-- x86_64-kexec
> | `-- arch-x86-kernel-nmi.c:warning:no-previous-prototype-for-set_nmi_torture
> |-- x86_64-randconfig-a011
> | `-- arch-x86-kernel-nmi.c:warning:no-previous-prototype-for-set_nmi_torture
> |-- x86_64-randconfig-a013
> | `-- arch-x86-kernel-nmi.c:warning:no-previous-prototype-for-set_nmi_torture
> |-- x86_64-randconfig-a015
> | `-- arch-x86-kernel-nmi.c:warning:no-previous-prototype-for-set_nmi_torture
> |-- x86_64-randconfig-c002
> | `-- arch-x86-kernel-nmi.c:warning:no-previous-prototype-for-set_nmi_torture
> `-- x86_64-randconfig-m001
> `-- arch-x86-kernel-nmi.c:warning:no-previous-prototype-for-set_nmi_torture
> clang_recent_errors
> |-- arm-milbeaut_m10v_defconfig
> | `-- arch-arm-kernel-smp.c:warning:function-declared-noreturn-should-not-return
> |-- i386-allnoconfig
> | `-- arch-x86-kernel-nmi.c:warning:no-previous-prototype-for-function-set_nmi_torture
> |-- powerpc-buildonly-randconfig-r003-20230427
> | `-- arch-powerpc-kernel-smp.c:error:function-declared-noreturn-should-not-return-Werror-Winvalid-noreturn
> |-- x86_64-randconfig-a005
> | `-- arch-x86-kernel-nmi.c:warning:no-previous-prototype-for-function-set_nmi_torture
> |-- x86_64-randconfig-a014
> | `-- arch-x86-kernel-nmi.c:warning:no-previous-prototype-for-function-set_nmi_torture
> `-- x86_64-randconfig-a016
> `-- arch-x86-kernel-nmi.c:warning:no-previous-prototype-for-function-set_nmi_torture
>
> elapsed time: 723m
>
> configs tested: 109
> configs skipped: 9
>
> tested configs:
> alpha allyesconfig gcc
> alpha defconfig gcc
> arc allyesconfig gcc
> arc axs101_defconfig gcc
> arc defconfig gcc
> arc randconfig-r002-20230427 gcc
> arc randconfig-r043-20230427 gcc
> arc vdk_hs38_defconfig gcc
> arm allmodconfig gcc
> arm allyesconfig gcc
> arm buildonly-randconfig-r006-20230427 gcc
> arm defconfig gcc
> arm imxrt_defconfig gcc
> arm milbeaut_m10v_defconfig clang
> arm netwinder_defconfig clang
> arm randconfig-r011-20230427 gcc
> arm randconfig-r046-20230427 gcc
> arm64 allyesconfig gcc
> arm64 defconfig gcc
> csky defconfig gcc
> csky randconfig-r015-20230427 gcc
> hexagon buildonly-randconfig-r003-20230427 clang
> hexagon randconfig-r003-20230427 clang
> hexagon randconfig-r004-20230427 clang
> hexagon randconfig-r041-20230427 clang
> hexagon randconfig-r045-20230427 clang
> i386 allnoconfig clang
> i386 allyesconfig gcc
> i386 debian-10.3 gcc
> i386 defconfig gcc
> i386 randconfig-a001 gcc
> i386 randconfig-a002 clang
> i386 randconfig-a003 gcc
> i386 randconfig-a004 clang
> i386 randconfig-a005 gcc
> i386 randconfig-a006 clang
> i386 randconfig-a011 clang
> i386 randconfig-a012 gcc
> i386 randconfig-a013 clang
> i386 randconfig-a014 gcc
> i386 randconfig-a015 clang
> i386 randconfig-a016 gcc
> ia64 allmodconfig gcc
> ia64 buildonly-randconfig-r004-20230427 gcc
> ia64 defconfig gcc
> loongarch allmodconfig gcc
> loongarch allnoconfig gcc
> loongarch defconfig gcc
> loongarch randconfig-r013-20230427 gcc
> loongarch randconfig-r016-20230427 gcc
> loongarch randconfig-r025-20230427 gcc
> m68k allmodconfig gcc
> m68k defconfig gcc
> microblaze buildonly-randconfig-r005-20230427 gcc
> microblaze randconfig-r001-20230427 gcc
> microblaze randconfig-r012-20230427 gcc
> mips allmodconfig gcc
> mips allyesconfig gcc
> nios2 defconfig gcc
> nios2 randconfig-r034-20230427 gcc
> nios2 randconfig-r036-20230427 gcc
> parisc defconfig gcc
> parisc randconfig-r024-20230427 gcc
> parisc64 defconfig gcc
> powerpc allmodconfig gcc
> powerpc allnoconfig gcc
> powerpc mpc834x_itx_defconfig gcc
> powerpc mpc836x_rdk_defconfig clang
> powerpc randconfig-r026-20230427 clang
> powerpc redwood_defconfig gcc
> riscv allmodconfig gcc
> riscv allnoconfig gcc
> riscv defconfig gcc
> riscv randconfig-r021-20230427 clang
> riscv randconfig-r022-20230427 clang
> riscv randconfig-r042-20230427 clang
> riscv rv32_defconfig gcc
> s390 allmodconfig gcc
> s390 allyesconfig gcc
> s390 defconfig gcc
> s390 randconfig-r006-20230427 gcc
> s390 randconfig-r044-20230427 clang
> sh allmodconfig gcc
> sh landisk_defconfig gcc
> sh secureedge5410_defconfig gcc
> sparc buildonly-randconfig-r002-20230427 gcc
> sparc defconfig gcc
> sparc randconfig-r005-20230427 gcc
> um defconfig gcc
> um i386_defconfig gcc
> um x86_64_defconfig gcc
> x86_64 allnoconfig gcc
> x86_64 allyesconfig gcc
> x86_64 defconfig gcc
> x86_64 kexec gcc
> x86_64 randconfig-a001 clang
> x86_64 randconfig-a002 gcc
> x86_64 randconfig-a003 clang
> x86_64 randconfig-a004 gcc
> x86_64 randconfig-a005 clang
> x86_64 randconfig-a006 gcc
> x86_64 randconfig-a011 gcc
> x86_64 randconfig-a012 clang
> x86_64 randconfig-a013 gcc
> x86_64 randconfig-a014 clang
> x86_64 randconfig-a015 gcc
> x86_64 randconfig-a016 clang
> x86_64 rhel-8.3 gcc
> xtensa randconfig-r033-20230427 gcc
>
> --
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests