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From: kbuild test robot <lkp@intel.com>
To: Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: "Stephen Hemminger" <sthemmin@microsoft.com>,
	kvm@vger.kernel.org, "Radim Krčmář" <rkrcmar@redhat.com>,
	"Haiyang Zhang" <haiyangz@microsoft.com>,
	x86@kernel.org, linux-kernel@vger.kernel.org,
	"Paolo Bonzini" <pbonzini@redhat.com>,
	"Michael Kelley (EOSG)" <Michael.H.Kelley@microsoft.com>,
	"Ingo Molnar" <mingo@redhat.com>,
	kbuild-all@01.org, "Andy Lutomirski" <luto@kernel.org>,
	"H. Peter Anvin" <hpa@zytor.com>,
	devel@linuxdriverproject.org,
	"Thomas Gleixner" <tglx@linutronix.de>,
	"Mohammed Gamal" <mmorsy@redhat.com>,
	"Roman Kagan" <rkagan@virtuozzo.com>
Subject: Re: [PATCH v3 3/7] x86/hyper-v: reenlightenment notifications support
Date: Fri, 19 Jan 2018 19:11:58 +0800	[thread overview]
Message-ID: <201801191829.4gWN3Hwf%fengguang.wu@intel.com> (raw)
In-Reply-To: <20180116182700.1042-4-vkuznets@redhat.com>

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Hi Vitaly,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on tip/auto-latest]
[also build test WARNING on v4.15-rc8 next-20180118]
[cannot apply to tip/x86/core kvm/linux-next]
[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/Vitaly-Kuznetsov/x86-kvm-hyperv-stable-clocksorce-for-L2-guests-when-running-nested-KVM-on-Hyper-V/20180119-160814
config: x86_64-randconfig-s5-01191733 (attached as .config)
compiler: gcc-7 (Debian 7.2.0-12) 7.2.1 20171025
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

   In file included from arch/x86/include/asm/string.h:3:0,
                    from include/linux/string.h:19,
                    from arch/x86/include/asm/page_32.h:35,
                    from arch/x86/include/asm/page.h:14,
                    from arch/x86/include/asm/thread_info.h:12,
                    from include/linux/thread_info.h:38,
                    from arch/x86/include/asm/preempt.h:7,
                    from include/linux/preempt.h:81,
                    from include/linux/spinlock.h:51,
                    from include/linux/seqlock.h:36,
                    from include/linux/time.h:6,
                    from include/uapi/linux/timex.h:56,
                    from include/linux/timex.h:56,
                    from include/linux/clocksource.h:13,
                    from arch/x86/include/asm/vgtod.h:6,
                    from arch/x86//entry/vdso/vdso32/../vclock_gettime.c:15,
                    from arch/x86//entry/vdso/vdso32/vclock_gettime.c:33:
   arch/x86/include/asm/pgtable.h: In function 'clone_pgd_range':
   arch/x86/include/asm/pgtable.h:1129:9: error: implicit declaration of function 'kernel_to_user_pgdp'; did you mean 'u64_to_user_ptr'? [-Werror=implicit-function-declaration]
     memcpy(kernel_to_user_pgdp(dst), kernel_to_user_pgdp(src),
            ^
   arch/x86/include/asm/string_32.h:183:42: note: in definition of macro 'memcpy'
    #define memcpy(t, f, n) __builtin_memcpy(t, f, n)
                                             ^
>> arch/x86/include/asm/pgtable.h:1129:9: warning: passing argument 1 of '__builtin_memcpy' makes pointer from integer without a cast [-Wint-conversion]
     memcpy(kernel_to_user_pgdp(dst), kernel_to_user_pgdp(src),
            ^
   arch/x86/include/asm/string_32.h:183:42: note: in definition of macro 'memcpy'
    #define memcpy(t, f, n) __builtin_memcpy(t, f, n)
                                             ^
   arch/x86/include/asm/pgtable.h:1129:9: note: expected 'void *' but argument is of type 'int'
     memcpy(kernel_to_user_pgdp(dst), kernel_to_user_pgdp(src),
            ^
   arch/x86/include/asm/string_32.h:183:42: note: in definition of macro 'memcpy'
    #define memcpy(t, f, n) __builtin_memcpy(t, f, n)
                                             ^
   arch/x86/include/asm/pgtable.h:1129:35: warning: passing argument 2 of '__builtin_memcpy' makes pointer from integer without a cast [-Wint-conversion]
     memcpy(kernel_to_user_pgdp(dst), kernel_to_user_pgdp(src),
                                      ^
   arch/x86/include/asm/string_32.h:183:45: note: in definition of macro 'memcpy'
    #define memcpy(t, f, n) __builtin_memcpy(t, f, n)
                                                ^
   arch/x86/include/asm/pgtable.h:1129:35: note: expected 'const void *' but argument is of type 'int'
     memcpy(kernel_to_user_pgdp(dst), kernel_to_user_pgdp(src),
                                      ^
   arch/x86/include/asm/string_32.h:183:45: note: in definition of macro 'memcpy'
    #define memcpy(t, f, n) __builtin_memcpy(t, f, n)
                                                ^
   cc1: some warnings being treated as errors

vim +/__builtin_memcpy +1129 arch/x86/include/asm/pgtable.h

1501899a arch/x86/include/asm/pgtable.h Dan Williams        2017-11-29  1111  
85958b46 include/asm-x86/pgtable.h      Jeremy Fitzhardinge 2008-03-17  1112  /*
85958b46 include/asm-x86/pgtable.h      Jeremy Fitzhardinge 2008-03-17  1113   * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
85958b46 include/asm-x86/pgtable.h      Jeremy Fitzhardinge 2008-03-17  1114   *
85958b46 include/asm-x86/pgtable.h      Jeremy Fitzhardinge 2008-03-17  1115   *  dst - pointer to pgd range anwhere on a pgd page
85958b46 include/asm-x86/pgtable.h      Jeremy Fitzhardinge 2008-03-17  1116   *  src - ""
85958b46 include/asm-x86/pgtable.h      Jeremy Fitzhardinge 2008-03-17  1117   *  count - the number of pgds to copy.
85958b46 include/asm-x86/pgtable.h      Jeremy Fitzhardinge 2008-03-17  1118   *
85958b46 include/asm-x86/pgtable.h      Jeremy Fitzhardinge 2008-03-17  1119   * dst and src can be on the same page, but the range must not overlap,
85958b46 include/asm-x86/pgtable.h      Jeremy Fitzhardinge 2008-03-17  1120   * and must not cross a page boundary.
85958b46 include/asm-x86/pgtable.h      Jeremy Fitzhardinge 2008-03-17  1121   */
85958b46 include/asm-x86/pgtable.h      Jeremy Fitzhardinge 2008-03-17  1122  static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
85958b46 include/asm-x86/pgtable.h      Jeremy Fitzhardinge 2008-03-17  1123  {
85958b46 include/asm-x86/pgtable.h      Jeremy Fitzhardinge 2008-03-17  1124  	memcpy(dst, src, count * sizeof(pgd_t));
fc2fbc85 arch/x86/include/asm/pgtable.h Dave Hansen         2017-12-04  1125  #ifdef CONFIG_PAGE_TABLE_ISOLATION
fc2fbc85 arch/x86/include/asm/pgtable.h Dave Hansen         2017-12-04  1126  	if (!static_cpu_has(X86_FEATURE_PTI))
fc2fbc85 arch/x86/include/asm/pgtable.h Dave Hansen         2017-12-04  1127  		return;
fc2fbc85 arch/x86/include/asm/pgtable.h Dave Hansen         2017-12-04  1128  	/* Clone the user space pgd as well */
fc2fbc85 arch/x86/include/asm/pgtable.h Dave Hansen         2017-12-04 @1129  	memcpy(kernel_to_user_pgdp(dst), kernel_to_user_pgdp(src),
fc2fbc85 arch/x86/include/asm/pgtable.h Dave Hansen         2017-12-04  1130  	       count * sizeof(pgd_t));
fc2fbc85 arch/x86/include/asm/pgtable.h Dave Hansen         2017-12-04  1131  #endif
85958b46 include/asm-x86/pgtable.h      Jeremy Fitzhardinge 2008-03-17  1132  }
85958b46 include/asm-x86/pgtable.h      Jeremy Fitzhardinge 2008-03-17  1133  

:::::: The code at line 1129 was first introduced by commit
:::::: fc2fbc8512ed08d1de7720936fd7d2e4ce02c3a2 x86/mm/pti: Populate user PGD

:::::: TO: Dave Hansen <dave.hansen@linux.intel.com>
:::::: CC: Ingo Molnar <mingo@kernel.org>

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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  parent reply	other threads:[~2018-01-19 11:11 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-01-16 18:26 [PATCH v3 0/7] x86/kvm/hyperv: stable clocksorce for L2 guests when running nested KVM on Hyper-V Vitaly Kuznetsov
2018-01-16 18:26 ` [PATCH v3 1/7] x86/hyper-v: check for required priviliges in hyperv_init() Vitaly Kuznetsov
2018-01-16 18:26 ` [PATCH v3 2/7] x86/hyper-v: add a function to read both TSC and TSC page value simulateneously Vitaly Kuznetsov
2018-01-16 18:26 ` [PATCH v3 3/7] x86/hyper-v: reenlightenment notifications support Vitaly Kuznetsov
2018-01-16 18:33   ` Thomas Gleixner
2018-01-19 10:21   ` kbuild test robot
2018-01-19 10:47     ` Vitaly Kuznetsov
2018-01-20  7:48       ` Thomas Gleixner
2018-01-22  1:22         ` Michael Kelley (EOSG)
2018-01-22 12:06           ` Vitaly Kuznetsov
2018-01-23 13:41             ` Vitaly Kuznetsov
2018-01-23 14:02               ` Michael Kelley (EOSG)
2018-01-23 14:07                 ` Vitaly Kuznetsov
2018-01-22 10:41         ` Vitaly Kuznetsov
2018-01-19 11:11   ` kbuild test robot [this message]
2018-01-16 18:26 ` [PATCH v3 4/7] x86/hyper-v: redirect reenlightment notifications on CPU offlining Vitaly Kuznetsov
2018-01-16 18:31   ` Thomas Gleixner
2018-01-16 18:26 ` [PATCH v3 5/7] x86/irq: Count Hyper-V reenlightenment interrupts Vitaly Kuznetsov
2018-01-16 18:32   ` Thomas Gleixner
2018-01-16 18:26 ` [PATCH v3 6/7] x86/kvm: pass stable clocksource to guests when running nested on Hyper-V Vitaly Kuznetsov
2018-01-16 18:27 ` [PATCH v3 7/7] x86/kvm: support Hyper-V reenlightenment Vitaly Kuznetsov
2018-01-19 11:15   ` kbuild test robot
2018-01-19 11:15   ` [RFC PATCH] x86/kvm: kvm_hyperv_tsc_notifier() can be static kbuild test robot

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