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Date: Thu, 10 Mar 2016 03:41:45 +0800
From: kbuild test robot <lkp@intel.com>
To: Benjamin LaHaise <bcrl@kvack.org>
Cc: kbuild-all@01.org, "H. Peter Anvin" <hpa@zytor.com>,
        Ingo Molnar <mingo@redhat.com>, Russell King <rmk@arm.linux.org.uk>,
        Thomas Gleixner <tglx@linutronix.de>, x86@kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH] x86_32: add support for 64 bit __get_user() v2
Message-ID: <201603100333.YF09BvSw%fengguang.wu@intel.com>
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Hi Benjamin,

[auto build test WARNING on tip/x86/core]
[also build test WARNING on v4.5-rc7 next-20160309]
[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]

url:    https://github.com/0day-ci/linux/commits/Benjamin-LaHaise/x86_32-add-support-for-64-bit-__get_user-v2/20160310-033507
config: i386-tinyconfig (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All warnings (new ones prefixed by >>):

   In file included from arch/x86/include/asm/sections.h:5:0,
                    from arch/x86/include/asm/hw_irq.h:26,
                    from include/linux/irq.h:418,
                    from arch/x86/include/asm/hardirq.h:5,
                    from include/linux/hardirq.h:8,
                    from include/linux/memcontrol.h:24,
                    from include/linux/tracehook.h:53,
                    from arch/x86/kernel/ptrace.c:14:
   arch/x86/kernel/ptrace.c: In function 'genregs_set':
>> arch/x86/kernel/ptrace.c:530:28: warning: operation on 'u' may be undefined [-Wsequence-point]
       ret = __get_user(word, u++);
                               ^
   arch/x86/include/asm/uaccess.h:451:51: note: in definition of macro '__m'
    #define __m(x) (*(struct __large_struct __user *)(x))
                                                      ^
>> arch/x86/include/asm/uaccess.h:378:3: note: in expansion of macro '__get_user_asm_u64'
      __get_user_asm_u64(x, ptr, retval, errret);  \
      ^
>> arch/x86/include/asm/uaccess.h:443:2: note: in expansion of macro '__get_user_size'
     __get_user_size(__gu_val, (ptr), (size), __gu_err, -EFAULT); \
     ^
>> arch/x86/include/asm/uaccess.h:512:2: note: in expansion of macro '__get_user_nocheck'
     __get_user_nocheck((x), (ptr), sizeof(*(ptr)))
     ^
>> arch/x86/kernel/ptrace.c:530:10: note: in expansion of macro '__get_user'
       ret = __get_user(word, u++);
             ^
--
   In file included from lib/bitmap.c:17:0:
   lib/bitmap.c: In function '__bitmap_parse':
>> lib/bitmap.c:377:27: warning: operation on 'ubuf' may be undefined [-Wsequence-point]
        if (__get_user(c, ubuf++))
                              ^
   arch/x86/include/asm/uaccess.h:451:51: note: in definition of macro '__m'
    #define __m(x) (*(struct __large_struct __user *)(x))
                                                      ^
>> arch/x86/include/asm/uaccess.h:378:3: note: in expansion of macro '__get_user_asm_u64'
      __get_user_asm_u64(x, ptr, retval, errret);  \
      ^
>> arch/x86/include/asm/uaccess.h:443:2: note: in expansion of macro '__get_user_size'
     __get_user_size(__gu_val, (ptr), (size), __gu_err, -EFAULT); \
     ^
>> arch/x86/include/asm/uaccess.h:512:2: note: in expansion of macro '__get_user_nocheck'
     __get_user_nocheck((x), (ptr), sizeof(*(ptr)))
     ^
>> lib/bitmap.c:377:9: note: in expansion of macro '__get_user'
        if (__get_user(c, ubuf++))
            ^
   lib/bitmap.c: In function '__bitmap_parselist':
   lib/bitmap.c:525:27: warning: operation on 'ubuf' may be undefined [-Wsequence-point]
        if (__get_user(c, ubuf++))
                              ^
   arch/x86/include/asm/uaccess.h:451:51: note: in definition of macro '__m'
    #define __m(x) (*(struct __large_struct __user *)(x))
                                                      ^
>> arch/x86/include/asm/uaccess.h:378:3: note: in expansion of macro '__get_user_asm_u64'
      __get_user_asm_u64(x, ptr, retval, errret);  \
      ^
>> arch/x86/include/asm/uaccess.h:443:2: note: in expansion of macro '__get_user_size'
     __get_user_size(__gu_val, (ptr), (size), __gu_err, -EFAULT); \
     ^
>> arch/x86/include/asm/uaccess.h:512:2: note: in expansion of macro '__get_user_nocheck'
     __get_user_nocheck((x), (ptr), sizeof(*(ptr)))
     ^
   lib/bitmap.c:525:9: note: in expansion of macro '__get_user'
        if (__get_user(c, ubuf++))
            ^

vim +/__get_user_asm_u64 +378 arch/x86/include/asm/uaccess.h

3f168221 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  372  		__get_user_asm(x, ptr, retval, "w", "w", "=r", errret);	\
3f168221 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  373  		break;							\
3f168221 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  374  	case 4:								\
3f168221 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  375  		__get_user_asm(x, ptr, retval, "l", "k", "=r", errret);	\
3f168221 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  376  		break;							\
3f168221 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  377  	case 8:								\
3f168221 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25 @378  		__get_user_asm_u64(x, ptr, retval, errret);		\
3f168221 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  379  		break;							\
3f168221 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  380  	default:							\
3f168221 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  381  		(x) = __get_user_bad();					\
3f168221 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  382  	}								\
3f168221 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  383  } while (0)
3f168221 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  384  
3f168221 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  385  #define __get_user_asm(x, addr, err, itype, rtype, ltype, errret)	\
11f1a4b9 arch/x86/include/asm/uaccess.h Linus Torvalds    2015-12-17  386  	asm volatile("\n"						\
63bcff2a arch/x86/include/asm/uaccess.h H. Peter Anvin    2012-09-21  387  		     "1:	mov"itype" %2,%"rtype"1\n"		\
11f1a4b9 arch/x86/include/asm/uaccess.h Linus Torvalds    2015-12-17  388  		     "2:\n"						\
3f168221 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  389  		     ".section .fixup,\"ax\"\n"				\
3f168221 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  390  		     "3:	mov %3,%0\n"				\
3f168221 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  391  		     "	xor"itype" %"rtype"1,%"rtype"1\n"		\
3f168221 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  392  		     "	jmp 2b\n"					\
3f168221 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  393  		     ".previous\n"					\
3f168221 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  394  		     _ASM_EXTABLE(1b, 3b)				\
3f168221 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  395  		     : "=r" (err), ltype(x)				\
3f168221 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  396  		     : "m" (__m(addr)), "i" (errret), "0" (err))
3f168221 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  397  
11f1a4b9 arch/x86/include/asm/uaccess.h Linus Torvalds    2015-12-17  398  /*
11f1a4b9 arch/x86/include/asm/uaccess.h Linus Torvalds    2015-12-17  399   * This doesn't do __uaccess_begin/end - the exception handling
11f1a4b9 arch/x86/include/asm/uaccess.h Linus Torvalds    2015-12-17  400   * around it must do that.
11f1a4b9 arch/x86/include/asm/uaccess.h Linus Torvalds    2015-12-17  401   */
fe40c0af arch/x86/include/asm/uaccess.h Hiroshi Shimamoto 2009-01-23  402  #define __get_user_size_ex(x, ptr, size)				\
fe40c0af arch/x86/include/asm/uaccess.h Hiroshi Shimamoto 2009-01-23  403  do {									\
fe40c0af arch/x86/include/asm/uaccess.h Hiroshi Shimamoto 2009-01-23  404  	__chk_user_ptr(ptr);						\
fe40c0af arch/x86/include/asm/uaccess.h Hiroshi Shimamoto 2009-01-23  405  	switch (size) {							\
fe40c0af arch/x86/include/asm/uaccess.h Hiroshi Shimamoto 2009-01-23  406  	case 1:								\
fe40c0af arch/x86/include/asm/uaccess.h Hiroshi Shimamoto 2009-01-23  407  		__get_user_asm_ex(x, ptr, "b", "b", "=q");		\
fe40c0af arch/x86/include/asm/uaccess.h Hiroshi Shimamoto 2009-01-23  408  		break;							\
fe40c0af arch/x86/include/asm/uaccess.h Hiroshi Shimamoto 2009-01-23  409  	case 2:								\
fe40c0af arch/x86/include/asm/uaccess.h Hiroshi Shimamoto 2009-01-23  410  		__get_user_asm_ex(x, ptr, "w", "w", "=r");		\
fe40c0af arch/x86/include/asm/uaccess.h Hiroshi Shimamoto 2009-01-23  411  		break;							\
fe40c0af arch/x86/include/asm/uaccess.h Hiroshi Shimamoto 2009-01-23  412  	case 4:								\
fe40c0af arch/x86/include/asm/uaccess.h Hiroshi Shimamoto 2009-01-23  413  		__get_user_asm_ex(x, ptr, "l", "k", "=r");		\
fe40c0af arch/x86/include/asm/uaccess.h Hiroshi Shimamoto 2009-01-23  414  		break;							\
fe40c0af arch/x86/include/asm/uaccess.h Hiroshi Shimamoto 2009-01-23  415  	case 8:								\
fe40c0af arch/x86/include/asm/uaccess.h Hiroshi Shimamoto 2009-01-23  416  		__get_user_asm_ex_u64(x, ptr);				\
fe40c0af arch/x86/include/asm/uaccess.h Hiroshi Shimamoto 2009-01-23  417  		break;							\
fe40c0af arch/x86/include/asm/uaccess.h Hiroshi Shimamoto 2009-01-23  418  	default:							\
fe40c0af arch/x86/include/asm/uaccess.h Hiroshi Shimamoto 2009-01-23  419  		(x) = __get_user_bad();					\
fe40c0af arch/x86/include/asm/uaccess.h Hiroshi Shimamoto 2009-01-23  420  	}								\
fe40c0af arch/x86/include/asm/uaccess.h Hiroshi Shimamoto 2009-01-23  421  } while (0)
fe40c0af arch/x86/include/asm/uaccess.h Hiroshi Shimamoto 2009-01-23  422  
fe40c0af arch/x86/include/asm/uaccess.h Hiroshi Shimamoto 2009-01-23  423  #define __get_user_asm_ex(x, addr, itype, rtype, ltype)			\
5e88353d arch/x86/include/asm/uaccess.h H. Peter Anvin    2012-09-21  424  	asm volatile("1:	mov"itype" %1,%"rtype"0\n"		\
5e88353d arch/x86/include/asm/uaccess.h H. Peter Anvin    2012-09-21  425  		     "2:\n"						\
535c0c34 arch/x86/include/asm/uaccess.h H. Peter Anvin    2012-04-20  426  		     _ASM_EXTABLE_EX(1b, 2b)				\
fe40c0af arch/x86/include/asm/uaccess.h Hiroshi Shimamoto 2009-01-23  427  		     : ltype(x) : "m" (__m(addr)))
fe40c0af arch/x86/include/asm/uaccess.h Hiroshi Shimamoto 2009-01-23  428  
dc70ddf4 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  429  #define __put_user_nocheck(x, ptr, size)			\
dc70ddf4 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  430  ({								\
16855f87 arch/x86/include/asm/uaccess.h Hiroshi Shimamoto 2008-12-08  431  	int __pu_err;						\
11f1a4b9 arch/x86/include/asm/uaccess.h Linus Torvalds    2015-12-17  432  	__uaccess_begin();					\
dc70ddf4 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  433  	__put_user_size((x), (ptr), (size), __pu_err, -EFAULT);	\
11f1a4b9 arch/x86/include/asm/uaccess.h Linus Torvalds    2015-12-17  434  	__uaccess_end();					\
a76cf66e arch/x86/include/asm/uaccess.h Andy Lutomirski   2015-10-05  435  	__builtin_expect(__pu_err, 0);				\
dc70ddf4 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  436  })
dc70ddf4 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  437  
3f168221 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  438  #define __get_user_nocheck(x, ptr, size)				\
3f168221 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  439  ({									\
16855f87 arch/x86/include/asm/uaccess.h Hiroshi Shimamoto 2008-12-08  440  	int __gu_err;							\
7dd119d0 arch/x86/include/asm/uaccess.h Benjamin LaHaise  2016-03-09  441  	__inttype(*(ptr)) __gu_val;					\
11f1a4b9 arch/x86/include/asm/uaccess.h Linus Torvalds    2015-12-17  442  	__uaccess_begin();						\
3f168221 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25 @443  	__get_user_size(__gu_val, (ptr), (size), __gu_err, -EFAULT);	\
11f1a4b9 arch/x86/include/asm/uaccess.h Linus Torvalds    2015-12-17  444  	__uaccess_end();						\
3f168221 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  445  	(x) = (__force __typeof__(*(ptr)))__gu_val;			\
a76cf66e arch/x86/include/asm/uaccess.h Andy Lutomirski   2015-10-05  446  	__builtin_expect(__gu_err, 0);					\
3f168221 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  447  })
dc70ddf4 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  448  
dc70ddf4 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  449  /* FIXME: this hack is definitely wrong -AK */
dc70ddf4 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  450  struct __large_struct { unsigned long buf[100]; };
dc70ddf4 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25 @451  #define __m(x) (*(struct __large_struct __user *)(x))
dc70ddf4 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  452  
dc70ddf4 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  453  /*
dc70ddf4 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  454   * Tell gcc we read from memory instead of writing: this is because
dc70ddf4 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  455   * we do not write to any memory gcc knows about, so there are no
dc70ddf4 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  456   * aliasing issues.
dc70ddf4 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  457   */
dc70ddf4 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  458  #define __put_user_asm(x, addr, err, itype, rtype, ltype, errret)	\
11f1a4b9 arch/x86/include/asm/uaccess.h Linus Torvalds    2015-12-17  459  	asm volatile("\n"						\
63bcff2a arch/x86/include/asm/uaccess.h H. Peter Anvin    2012-09-21  460  		     "1:	mov"itype" %"rtype"1,%2\n"		\
11f1a4b9 arch/x86/include/asm/uaccess.h Linus Torvalds    2015-12-17  461  		     "2:\n"						\
dc70ddf4 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  462  		     ".section .fixup,\"ax\"\n"				\
dc70ddf4 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  463  		     "3:	mov %3,%0\n"				\
dc70ddf4 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  464  		     "	jmp 2b\n"					\
dc70ddf4 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  465  		     ".previous\n"					\
dc70ddf4 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  466  		     _ASM_EXTABLE(1b, 3b)				\
dc70ddf4 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  467  		     : "=r"(err)					\
dc70ddf4 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  468  		     : ltype(x), "m" (__m(addr)), "i" (errret), "0" (err))
fe40c0af arch/x86/include/asm/uaccess.h Hiroshi Shimamoto 2009-01-23  469  
fe40c0af arch/x86/include/asm/uaccess.h Hiroshi Shimamoto 2009-01-23  470  #define __put_user_asm_ex(x, addr, itype, rtype, ltype)			\
5e88353d arch/x86/include/asm/uaccess.h H. Peter Anvin    2012-09-21  471  	asm volatile("1:	mov"itype" %"rtype"0,%1\n"		\
5e88353d arch/x86/include/asm/uaccess.h H. Peter Anvin    2012-09-21  472  		     "2:\n"						\
535c0c34 arch/x86/include/asm/uaccess.h H. Peter Anvin    2012-04-20  473  		     _ASM_EXTABLE_EX(1b, 2b)				\
fe40c0af arch/x86/include/asm/uaccess.h Hiroshi Shimamoto 2009-01-23  474  		     : : ltype(x), "m" (__m(addr)))
fe40c0af arch/x86/include/asm/uaccess.h Hiroshi Shimamoto 2009-01-23  475  
fe40c0af arch/x86/include/asm/uaccess.h Hiroshi Shimamoto 2009-01-23  476  /*
fe40c0af arch/x86/include/asm/uaccess.h Hiroshi Shimamoto 2009-01-23  477   * uaccess_try and catch
fe40c0af arch/x86/include/asm/uaccess.h Hiroshi Shimamoto 2009-01-23  478   */
fe40c0af arch/x86/include/asm/uaccess.h Hiroshi Shimamoto 2009-01-23  479  #define uaccess_try	do {						\
fe40c0af arch/x86/include/asm/uaccess.h Hiroshi Shimamoto 2009-01-23  480  	current_thread_info()->uaccess_err = 0;				\
11f1a4b9 arch/x86/include/asm/uaccess.h Linus Torvalds    2015-12-17  481  	__uaccess_begin();						\
fe40c0af arch/x86/include/asm/uaccess.h Hiroshi Shimamoto 2009-01-23  482  	barrier();
fe40c0af arch/x86/include/asm/uaccess.h Hiroshi Shimamoto 2009-01-23  483  
fe40c0af arch/x86/include/asm/uaccess.h Hiroshi Shimamoto 2009-01-23  484  #define uaccess_catch(err)						\
11f1a4b9 arch/x86/include/asm/uaccess.h Linus Torvalds    2015-12-17  485  	__uaccess_end();						\
4fc34901 arch/x86/include/asm/uaccess.h Andy Lutomirski   2011-11-07  486  	(err) |= (current_thread_info()->uaccess_err ? -EFAULT : 0);	\
fe40c0af arch/x86/include/asm/uaccess.h Hiroshi Shimamoto 2009-01-23  487  } while (0)
fe40c0af arch/x86/include/asm/uaccess.h Hiroshi Shimamoto 2009-01-23  488  
8cb834e9 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  489  /**
8cb834e9 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  490   * __get_user: - Get a simple variable from user space, with less checking.
8cb834e9 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  491   * @x:   Variable to store result.
8cb834e9 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  492   * @ptr: Source address, in user space.
8cb834e9 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  493   *
b3c395ef arch/x86/include/asm/uaccess.h David Hildenbrand 2015-05-11  494   * Context: User context only. This function may sleep if pagefaults are
b3c395ef arch/x86/include/asm/uaccess.h David Hildenbrand 2015-05-11  495   *          enabled.
8cb834e9 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  496   *
8cb834e9 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  497   * This macro copies a single simple variable from user space to kernel
8cb834e9 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  498   * space.  It supports simple types like char and int, but not larger
8cb834e9 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  499   * data types like structures or arrays.
8cb834e9 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  500   *
8cb834e9 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  501   * @ptr must have pointer-to-simple-variable type, and the result of
8cb834e9 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  502   * dereferencing @ptr must be assignable to @x without a cast.
8cb834e9 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  503   *
8cb834e9 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  504   * Caller must check the pointer with access_ok() before calling this
8cb834e9 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  505   * function.
8cb834e9 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  506   *
8cb834e9 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  507   * Returns zero on success, or -EFAULT on error.
8cb834e9 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  508   * On error, the variable @x is set to zero.
8cb834e9 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  509   */
8cb834e9 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  510  
8cb834e9 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  511  #define __get_user(x, ptr)						\
8cb834e9 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25 @512  	__get_user_nocheck((x), (ptr), sizeof(*(ptr)))
fe40c0af arch/x86/include/asm/uaccess.h Hiroshi Shimamoto 2009-01-23  513  
8cb834e9 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  514  /**
8cb834e9 include/asm-x86/uaccess.h      Glauber Costa     2008-06-25  515   * __put_user: - Write a simple value into user space, with less checking.

:::::: The code at line 378 was first introduced by commit
:::::: 3f168221167ca7a844fde3bf58e1c7ca0bf9741e x86: merge __get_user_asm and its users.

:::::: TO: Glauber Costa <gcosta@redhat.com>
:::::: CC: Ingo Molnar <mingo@elte.hu>

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

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