linux-kernel - Re: [PATCH 08/10] x86/hyper-v: use hypercall for remote TLB flush

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Date:   Sat, 1 Jul 2017 08:17:04 +0800
From:   kbuild test robot <lkp@...el.com>
To:     kys@...hange.microsoft.com
Cc:     kbuild-all@...org, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org, devel@...uxdriverproject.org,
        olaf@...fle.de, apw@...onical.com, vkuznets@...hat.com,
        jasowang@...hat.com, leann.ogasawara@...onical.com,
        marcelo.cerri@...onical.com, sthemmin@...rosoft.com
Subject: Re: [PATCH 08/10] x86/hyper-v: use hypercall for remote TLB flush

Hi Vitaly,

[auto build test WARNING on next-20170619]
[cannot apply to tip/x86/core linus/master linux/master v4.12-rc6 v4.12-rc5 v4.12-rc4 v4.12-rc7]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/kys-exchange-microsoft-com/x86-hyper-v-include-hyperv-only-when-CONFIG_HYPERV-is-set/20170626-133601
config: x86_64-randconfig-ws0-07010157 (attached as .config)
compiler: gcc-4.8 (Debian 4.8.4-1) 4.8.4
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

   arch/x86//hyperv/mmu.c: In function 'hyperv_flush_tlb_others':
>> arch/x86//hyperv/mmu.c:120:2: warning: passing argument 2 of 'native_flush_tlb_others' from incompatible pointer type [enabled by default]
     native_flush_tlb_others(cpus, mm, start, end);
     ^
   In file included from arch/x86//hyperv/mmu.c:9:0:
   arch/x86/include/asm/tlbflush.h:256:6: note: expected 'const struct flush_tlb_info *' but argument is of type 'struct mm_struct *'
    void native_flush_tlb_others(const struct cpumask *cpumask,
         ^
   arch/x86//hyperv/mmu.c:120:2: error: too many arguments to function 'native_flush_tlb_others'
     native_flush_tlb_others(cpus, mm, start, end);
     ^
   In file included from arch/x86//hyperv/mmu.c:9:0:
   arch/x86/include/asm/tlbflush.h:256:6: note: declared here
    void native_flush_tlb_others(const struct cpumask *cpumask,
         ^
   arch/x86//hyperv/mmu.c: In function 'hyperv_setup_mmu_ops':
>> arch/x86//hyperv/mmu.c:127:31: warning: assignment from incompatible pointer type [enabled by default]
      pv_mmu_ops.flush_tlb_others = hyperv_flush_tlb_others;
                                  ^

vim +/native_flush_tlb_others +120 arch/x86//hyperv/mmu.c

   114	
   115		local_irq_restore(flags);
   116	
   117		if (!(status & HV_HYPERCALL_RESULT_MASK))
   118			return;
   119	do_native:
 > 120		native_flush_tlb_others(cpus, mm, start, end);
   121	}
   122	
   123	void hyperv_setup_mmu_ops(void)
   124	{
   125		if (ms_hyperv.hints & HV_X64_REMOTE_TLB_FLUSH_RECOMMENDED) {
   126			pr_info("Hyper-V: Using hypercall for remote TLB flush\n");
 > 127			pv_mmu_ops.flush_tlb_others = hyperv_flush_tlb_others;
   128		}
   129	}
   130	

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