Re: [PATCH 2/4] KVM: VMX: avoid double list add with VT-d posted interrupts

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Hi Paolo,

[auto build test ERROR on kvm/linux-next]
[also build test ERROR on v4.12-rc4 next-20170606]
[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/Paolo-Bonzini/VT-d-PI-fixes/20170607-042637
base:   https://git.kernel.org/pub/scm/virt/kvm/kvm.git linux-next
config: i386-randconfig-x012-201723 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   In file included from arch/x86/include/asm/atomic.h:7:0,
                    from include/linux/atomic.h:4,
                    from include/linux/mm_types_task.h:12,
                    from include/linux/mm_types.h:4,
                    from arch/x86//kvm/irq.h:25,
                    from arch/x86//kvm/vmx.c:19:
   arch/x86//kvm/vmx.c: In function '__pi_post_block':
   arch/x86/include/asm/cmpxchg.h:129:2: warning: '__ret' is used uninitialized in this function [-Wuninitialized]
     __ret;        \
     ^~~~~
   arch/x86/include/asm/cmpxchg.h:86:21: note: '__ret' was declared here
     __typeof__(*(ptr)) __ret;     \
                        ^
   arch/x86/include/asm/cmpxchg.h:133:2: note: in expansion of macro '__raw_cmpxchg'
     __raw_cmpxchg((ptr), (old), (new), (size), LOCK_PREFIX)
     ^~~~~~~~~~~~~
   arch/x86/include/asm/cmpxchg.h:148:2: note: in expansion of macro '__cmpxchg'
     __cmpxchg(ptr, old, new, sizeof(*(ptr)))
     ^~~~~~~~~
   arch/x86//kvm/vmx.c:11243:11: note: in expansion of macro 'cmpxchg'
     } while (cmpxchg(&pi_desc->control, old.control,
              ^~~~~~~
   In function '__pi_post_block',
       inlined from 'pi_post_block' at arch/x86//kvm/vmx.c:11342:2,
       inlined from 'vmx_post_block' at arch/x86//kvm/vmx.c:11351:2:
>> arch/x86/include/asm/cmpxchg.h:127:3: error: call to '__cmpxchg_wrong_size' declared with attribute error: Bad argument size for cmpxchg
      __cmpxchg_wrong_size();     \
      ^~~~~~~~~~~~~~~~~~~~~~
   arch/x86/include/asm/cmpxchg.h:133:2: note: in expansion of macro '__raw_cmpxchg'
     __raw_cmpxchg((ptr), (old), (new), (size), LOCK_PREFIX)
     ^~~~~~~~~~~~~
   arch/x86/include/asm/cmpxchg.h:148:2: note: in expansion of macro '__cmpxchg'
     __cmpxchg(ptr, old, new, sizeof(*(ptr)))
     ^~~~~~~~~
   arch/x86//kvm/vmx.c:11243:11: note: in expansion of macro 'cmpxchg'
     } while (cmpxchg(&pi_desc->control, old.control,
              ^~~~~~~
--
   In file included from arch/x86/include/asm/atomic.h:7:0,
                    from include/linux/atomic.h:4,
                    from include/linux/mm_types_task.h:12,
                    from include/linux/mm_types.h:4,
                    from arch/x86/kvm/irq.h:25,
                    from arch/x86/kvm/vmx.c:19:
   arch/x86/kvm/vmx.c: In function '__pi_post_block':
   arch/x86/include/asm/cmpxchg.h:129:2: warning: '__ret' is used uninitialized in this function [-Wuninitialized]
     __ret;        \
     ^~~~~
   arch/x86/include/asm/cmpxchg.h:86:21: note: '__ret' was declared here
     __typeof__(*(ptr)) __ret;     \
                        ^
   arch/x86/include/asm/cmpxchg.h:133:2: note: in expansion of macro '__raw_cmpxchg'
     __raw_cmpxchg((ptr), (old), (new), (size), LOCK_PREFIX)
     ^~~~~~~~~~~~~
   arch/x86/include/asm/cmpxchg.h:148:2: note: in expansion of macro '__cmpxchg'
     __cmpxchg(ptr, old, new, sizeof(*(ptr)))
     ^~~~~~~~~
   arch/x86/kvm/vmx.c:11243:11: note: in expansion of macro 'cmpxchg'
     } while (cmpxchg(&pi_desc->control, old.control,
              ^~~~~~~
   In function '__pi_post_block',
       inlined from 'pi_post_block' at arch/x86/kvm/vmx.c:11342:2,
       inlined from 'vmx_post_block' at arch/x86/kvm/vmx.c:11351:2:
>> arch/x86/include/asm/cmpxchg.h:127:3: error: call to '__cmpxchg_wrong_size' declared with attribute error: Bad argument size for cmpxchg
      __cmpxchg_wrong_size();     \
      ^~~~~~~~~~~~~~~~~~~~~~
   arch/x86/include/asm/cmpxchg.h:133:2: note: in expansion of macro '__raw_cmpxchg'
     __raw_cmpxchg((ptr), (old), (new), (size), LOCK_PREFIX)
     ^~~~~~~~~~~~~
   arch/x86/include/asm/cmpxchg.h:148:2: note: in expansion of macro '__cmpxchg'
     __cmpxchg(ptr, old, new, sizeof(*(ptr)))
     ^~~~~~~~~
   arch/x86/kvm/vmx.c:11243:11: note: in expansion of macro 'cmpxchg'
     } while (cmpxchg(&pi_desc->control, old.control,
              ^~~~~~~

vim +/__cmpxchg_wrong_size +127 arch/x86/include/asm/cmpxchg.h

e9826380 arch/x86/include/asm/cmpxchg.h Jeremy Fitzhardinge 2011-08-18  121  			     : "=a" (__ret), "+m" (*__ptr)		\
e9826380 arch/x86/include/asm/cmpxchg.h Jeremy Fitzhardinge 2011-08-18  122  			     : "r" (__new), "0" (__old)			\
e9826380 arch/x86/include/asm/cmpxchg.h Jeremy Fitzhardinge 2011-08-18  123  			     : "memory");				\
e9826380 arch/x86/include/asm/cmpxchg.h Jeremy Fitzhardinge 2011-08-18  124  		break;							\
e9826380 arch/x86/include/asm/cmpxchg.h Jeremy Fitzhardinge 2011-08-18  125  	}								\
e9826380 arch/x86/include/asm/cmpxchg.h Jeremy Fitzhardinge 2011-08-18  126  	default:							\
e9826380 arch/x86/include/asm/cmpxchg.h Jeremy Fitzhardinge 2011-08-18 @127  		__cmpxchg_wrong_size();					\
e9826380 arch/x86/include/asm/cmpxchg.h Jeremy Fitzhardinge 2011-08-18  128  	}								\
e9826380 arch/x86/include/asm/cmpxchg.h Jeremy Fitzhardinge 2011-08-18  129  	__ret;								\
e9826380 arch/x86/include/asm/cmpxchg.h Jeremy Fitzhardinge 2011-08-18  130  })
e9826380 arch/x86/include/asm/cmpxchg.h Jeremy Fitzhardinge 2011-08-18  131  
e9826380 arch/x86/include/asm/cmpxchg.h Jeremy Fitzhardinge 2011-08-18  132  #define __cmpxchg(ptr, old, new, size)					\
e9826380 arch/x86/include/asm/cmpxchg.h Jeremy Fitzhardinge 2011-08-18  133  	__raw_cmpxchg((ptr), (old), (new), (size), LOCK_PREFIX)
e9826380 arch/x86/include/asm/cmpxchg.h Jeremy Fitzhardinge 2011-08-18  134  
e9826380 arch/x86/include/asm/cmpxchg.h Jeremy Fitzhardinge 2011-08-18  135  #define __sync_cmpxchg(ptr, old, new, size)				\
e9826380 arch/x86/include/asm/cmpxchg.h Jeremy Fitzhardinge 2011-08-18  136  	__raw_cmpxchg((ptr), (old), (new), (size), "lock; ")
e9826380 arch/x86/include/asm/cmpxchg.h Jeremy Fitzhardinge 2011-08-18  137  
e9826380 arch/x86/include/asm/cmpxchg.h Jeremy Fitzhardinge 2011-08-18  138  #define __cmpxchg_local(ptr, old, new, size)				\
e9826380 arch/x86/include/asm/cmpxchg.h Jeremy Fitzhardinge 2011-08-18  139  	__raw_cmpxchg((ptr), (old), (new), (size), "")
e9826380 arch/x86/include/asm/cmpxchg.h Jeremy Fitzhardinge 2011-08-18  140  
96a388de include/asm-x86/cmpxchg.h      Thomas Gleixner     2007-10-11  141  #ifdef CONFIG_X86_32
a1ce3928 arch/x86/include/asm/cmpxchg.h David Howells       2012-10-02  142  # include <asm/cmpxchg_32.h>
96a388de include/asm-x86/cmpxchg.h      Thomas Gleixner     2007-10-11  143  #else
a1ce3928 arch/x86/include/asm/cmpxchg.h David Howells       2012-10-02  144  # include <asm/cmpxchg_64.h>
96a388de include/asm-x86/cmpxchg.h      Thomas Gleixner     2007-10-11  145  #endif
e9826380 arch/x86/include/asm/cmpxchg.h Jeremy Fitzhardinge 2011-08-18  146  
e9826380 arch/x86/include/asm/cmpxchg.h Jeremy Fitzhardinge 2011-08-18  147  #define cmpxchg(ptr, old, new)						\
fc395b92 arch/x86/include/asm/cmpxchg.h Jan Beulich         2012-01-26 @148  	__cmpxchg(ptr, old, new, sizeof(*(ptr)))
e9826380 arch/x86/include/asm/cmpxchg.h Jeremy Fitzhardinge 2011-08-18  149  
e9826380 arch/x86/include/asm/cmpxchg.h Jeremy Fitzhardinge 2011-08-18  150  #define sync_cmpxchg(ptr, old, new)					\
fc395b92 arch/x86/include/asm/cmpxchg.h Jan Beulich         2012-01-26  151  	__sync_cmpxchg(ptr, old, new, sizeof(*(ptr)))

:::::: The code at line 127 was first introduced by commit
:::::: e9826380d83d1bda3ee5663bf3fa4667a6fbe60a x86, cmpxchg: Unify cmpxchg into cmpxchg.h

:::::: TO: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
:::::: CC: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>

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

Attachment: .config.gz
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