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Date: Wed, 23 Feb 2022 09:16:59 +0000 From: Marc Zyngier <maz@...nel.org> To: Kalesh Singh <kaleshsingh@...gle.com>, kernel test robot <lkp@...el.com> Cc: llvm@...ts.linux.dev, kbuild-all@...ts.01.org, will@...nel.org, qperret@...gle.com, tabba@...gle.com, surenb@...gle.com, kernel-team@...roid.com, Catalin Marinas <catalin.marinas@....com>, James Morse <james.morse@....com>, Alexandru Elisei <alexandru.elisei@....com>, Suzuki K Poulose <suzuki.poulose@....com>, Ard Biesheuvel <ardb@...nel.org>, Mark Rutland <mark.rutland@....com>, Pasha Tatashin <pasha.tatashin@...een.com>, Joey Gouly <joey.gouly@....com>, Peter Collingbourne <pcc@...gle.com>, Andrew Scull <ascull@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>, Zenghui Yu <yuzenghui@...wei.com>, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, kvmarm@...ts.cs.columbia.edu Subject: Re: [PATCH v2 6/9] KVM: arm64: Detect and handle hypervisor stack overflows On Wed, 23 Feb 2022 09:05:18 +0000, kernel test robot <lkp@...el.com> wrote: > > Hi Kalesh, > > Thank you for the patch! Perhaps something to improve: > > [auto build test WARNING on cfb92440ee71adcc2105b0890bb01ac3cddb8507] > > url: https://github.com/0day-ci/linux/commits/Kalesh-Singh/KVM-arm64-Hypervisor-stack-enhancements/20220223-010522 > base: cfb92440ee71adcc2105b0890bb01ac3cddb8507 > config: arm64-randconfig-r011-20220221 (https://download.01.org/0day-ci/archive/20220223/202202231727.L621fVgD-lkp@intel.com/config) > compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project d271fc04d5b97b12e6b797c6067d3c96a8d7470e) > reproduce (this is a W=1 build): > wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross > chmod +x ~/bin/make.cross > # install arm64 cross compiling tool for clang build > # apt-get install binutils-aarch64-linux-gnu > # https://github.com/0day-ci/linux/commit/7fe99fd40f7c4b2973218045ca5b9c9160524db1 > git remote add linux-review https://github.com/0day-ci/linux > git fetch --no-tags linux-review Kalesh-Singh/KVM-arm64-Hypervisor-stack-enhancements/20220223-010522 > git checkout 7fe99fd40f7c4b2973218045ca5b9c9160524db1 > # save the config file to linux build tree > mkdir build_dir > COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash arch/arm64/ > > If you fix the issue, kindly add following tag as appropriate > Reported-by: kernel test robot <lkp@...el.com> > > All warnings (new ones prefixed by >>): > > include/linux/stddef.h:8:14: note: expanded from macro 'NULL' > #define NULL ((void *)0) > ^~~~~~~~~~~ > arch/arm64/kvm/hyp/nvhe/switch.c:200:27: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides] > [ESR_ELx_EC_FP_ASIMD] = kvm_hyp_handle_fpsimd, > ^~~~~~~~~~~~~~~~~~~~~ > arch/arm64/kvm/hyp/nvhe/switch.c:196:28: note: previous initialization is here > [0 ... ESR_ELx_EC_MAX] = NULL, > ^~~~ > include/linux/stddef.h:8:14: note: expanded from macro 'NULL' > #define NULL ((void *)0) > ^~~~~~~~~~~ Kalesh, please ignore this nonsense. There may be things to improve, but this is *NOT* one of them. These reports are pretty useless, and just lead people to ignore real bug reports. M. -- Without deviation from the norm, progress is not possible.
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