linux-kernel - Re: [PATCH 3/3] KVM: x86/mmu: always take tdp_mmu_pages

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Date:   Fri, 29 Sep 2023 09:16:30 -0700
From:   Sean Christopherson <seanjc@...gle.com>
To:     kernel test robot <lkp@...el.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, oe-kbuild-all@...ts.linux.dev
Subject: Re: [PATCH 3/3] KVM: x86/mmu: always take tdp_mmu_pages_lock

On Fri, Sep 29, 2023, kernel test robot wrote:
> Hi Paolo,
> 
> kernel test robot noticed the following build warnings:
> 
> [auto build test WARNING on kvm/queue]
> [also build test WARNING on linus/master v6.6-rc3 next-20230929]
> [cannot apply to mst-vhost/linux-next kvm/linux-next]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch#_base_tree_information]
> 
> url:    https://github.com/intel-lab-lkp/linux/commits/Paolo-Bonzini/KVM-x86-mmu-remove-unnecessary-bool-shared-argument-from-functions/20230929-003259
> base:   https://git.kernel.org/pub/scm/virt/kvm/kvm.git queue
> patch link:    https://lore.kernel.org/r/20230928162959.1514661-4-pbonzini%40redhat.com
> patch subject: [PATCH 3/3] KVM: x86/mmu: always take tdp_mmu_pages_lock
> config: x86_64-buildonly-randconfig-004-20230929 (https://download.01.org/0day-ci/archive/20230929/202309291557.Eq3JDvT6-lkp@intel.com/config)
> compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230929/202309291557.Eq3JDvT6-lkp@intel.com/reproduce)
> 
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@...el.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202309291557.Eq3JDvT6-lkp@intel.com/
> 
> All warnings (new ones prefixed by >>):
> 
> >> arch/x86/kvm/mmu/tdp_mmu.c:289: warning: Excess function parameter 'shared' description in 'tdp_mmu_unlink_sp'
> 
> 
> vim +289 arch/x86/kvm/mmu/tdp_mmu.c
> 
> 43a063cab325ee7 Yosry Ahmed         2022-08-23  278  
> a9442f594147f95 Ben Gardon          2021-02-02  279  /**
> c298a30c2821cb0 David Matlack       2022-01-19  280   * tdp_mmu_unlink_sp() - Remove a shadow page from the list of used pages
> a9442f594147f95 Ben Gardon          2021-02-02  281   *
> a9442f594147f95 Ben Gardon          2021-02-02  282   * @kvm: kvm instance
> a9442f594147f95 Ben Gardon          2021-02-02  283   * @sp: the page to be removed
> 9a77daacc87dee9 Ben Gardon          2021-02-02  284   * @shared: This operation may not be running under the exclusive use of
> 9a77daacc87dee9 Ben Gardon          2021-02-02  285   *	    the MMU lock and the operation must synchronize with other
> 9a77daacc87dee9 Ben Gardon          2021-02-02  286   *	    threads that might be adding or removing pages.
> a9442f594147f95 Ben Gardon          2021-02-02  287   */

The bot is complaining about the kernel doc, i.e. the above @shared documentation
needs to be deleted.  Took me a few seconds to understand what the complaint was
about...