Re: [PATCH v3 3/7] x86/hyper-v: reenlightenment notifications support

kbuild test robot
2018-01-19T11:11:58Z

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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>

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