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From: kbuild test robot <lkp@intel.com>
To: Mark Rutland <mark.rutland@arm.com>
Cc: kbuild-all@01.org, linux-kernel@vger.kernel.org,
	Mark Rutland <mark.rutland@arm.com>,
	Ingo Molnar <mingo@redhat.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Will Deacon <will.deacon@arm.com>
Subject: Re: [PATCH] perf/ring_buffer: ensure atomicity and order of updates
Date: Fri, 11 May 2018 09:19:52 +0800
Message-ID: <201805110720.idFXdx2h%fengguang.wu@intel.com> (raw)
In-Reply-To: <20180510130632.34497-1-mark.rutland@arm.com>


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Hi Mark,

I love your patch! Perhaps something to improve:

[auto build test WARNING on tip/perf/core]
[also build test WARNING on v4.17-rc4 next-20180510]
[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/Mark-Rutland/perf-ring_buffer-ensure-atomicity-and-order-of-updates/20180511-070205
config: i386-randconfig-s0-201818 (attached as .config)
compiler: gcc-6 (Debian 6.4.0-9) 6.4.0 20171026
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All warnings (new ones prefixed by >>):

   In file included from include/uapi/linux/swab.h:6:0,
                    from include/linux/swab.h:5,
                    from include/uapi/linux/byteorder/little_endian.h:13,
                    from include/linux/byteorder/little_endian.h:5,
                    from arch/x86/include/uapi/asm/byteorder.h:5,
                    from include/uapi/linux/perf_event.h:20,
                    from include/linux/perf_event.h:17,
                    from kernel/events/ring_buffer.c:12:
   kernel/events/ring_buffer.c: In function 'perf_output_put_handle':
   include/linux/compiler.h:339:38: error: call to '__compiletime_assert_86' declared with attribute error: Need native word sized stores/loads for atomicity.
     _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
                                         ^
   include/linux/compiler.h:319:4: note: in definition of macro '__compiletime_assert'
       prefix ## suffix();    \
       ^~~~~~
   include/linux/compiler.h:339:2: note: in expansion of macro '_compiletime_assert'
     _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
     ^~~~~~~~~~~~~~~~~~~
   include/linux/compiler.h:342:2: note: in expansion of macro 'compiletime_assert'
     compiletime_assert(__native_word(t),    \
     ^~~~~~~~~~~~~~~~~~
>> arch/x86/include/asm/barrier.h:69:2: note: in expansion of macro 'compiletime_assert_atomic_type'
     compiletime_assert_atomic_type(*p);    \
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> include/asm-generic/barrier.h:157:33: note: in expansion of macro '__smp_store_release'
    #define smp_store_release(p, v) __smp_store_release(p, v)
                                    ^~~~~~~~~~~~~~~~~~~
   kernel/events/ring_buffer.c:86:2: note: in expansion of macro 'smp_store_release'
     smp_store_release(&rb->user_page->data_head, head); /* B, matches C */
     ^~~~~~~~~~~~~~~~~
   kernel/events/ring_buffer.c: In function 'perf_aux_output_skip':
   include/linux/compiler.h:339:38: error: call to '__compiletime_assert_498' declared with attribute error: Need native word sized stores/loads for atomicity.
     _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
                                         ^
   include/linux/compiler.h:319:4: note: in definition of macro '__compiletime_assert'
       prefix ## suffix();    \
       ^~~~~~
   include/linux/compiler.h:339:2: note: in expansion of macro '_compiletime_assert'
     _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
     ^~~~~~~~~~~~~~~~~~~
   include/linux/compiler.h:342:2: note: in expansion of macro 'compiletime_assert'
     compiletime_assert(__native_word(t),    \
     ^~~~~~~~~~~~~~~~~~
>> arch/x86/include/asm/barrier.h:69:2: note: in expansion of macro 'compiletime_assert_atomic_type'
     compiletime_assert_atomic_type(*p);    \
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> include/asm-generic/barrier.h:157:33: note: in expansion of macro '__smp_store_release'
    #define smp_store_release(p, v) __smp_store_release(p, v)
                                    ^~~~~~~~~~~~~~~~~~~
   kernel/events/ring_buffer.c:498:2: note: in expansion of macro 'smp_store_release'
     smp_store_release(&rb->user_page->aux_head, rb->aux_head);
     ^~~~~~~~~~~~~~~~~
   kernel/events/ring_buffer.c: In function 'perf_aux_output_end':
   include/linux/compiler.h:339:38: error: call to '__compiletime_assert_466' declared with attribute error: Need native word sized stores/loads for atomicity.
     _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
                                         ^
   include/linux/compiler.h:319:4: note: in definition of macro '__compiletime_assert'
       prefix ## suffix();    \
       ^~~~~~
   include/linux/compiler.h:339:2: note: in expansion of macro '_compiletime_assert'
     _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
     ^~~~~~~~~~~~~~~~~~~
   include/linux/compiler.h:342:2: note: in expansion of macro 'compiletime_assert'
     compiletime_assert(__native_word(t),    \
     ^~~~~~~~~~~~~~~~~~
>> arch/x86/include/asm/barrier.h:69:2: note: in expansion of macro 'compiletime_assert_atomic_type'
     compiletime_assert_atomic_type(*p);    \
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> include/asm-generic/barrier.h:157:33: note: in expansion of macro '__smp_store_release'
    #define smp_store_release(p, v) __smp_store_release(p, v)
                                    ^~~~~~~~~~~~~~~~~~~
   kernel/events/ring_buffer.c:466:2: note: in expansion of macro 'smp_store_release'
     smp_store_release(&rb->user_page->aux_head, rb->aux_head);
     ^~~~~~~~~~~~~~~~~
--
   In file included from include/uapi/linux/swab.h:6:0,
                    from include/linux/swab.h:5,
                    from include/uapi/linux/byteorder/little_endian.h:13,
                    from include/linux/byteorder/little_endian.h:5,
                    from arch/x86/include/uapi/asm/byteorder.h:5,
                    from include/uapi/linux/perf_event.h:20,
                    from include/linux/perf_event.h:17,
                    from kernel//events/ring_buffer.c:12:
   kernel//events/ring_buffer.c: In function 'perf_output_put_handle':
   include/linux/compiler.h:339:38: error: call to '__compiletime_assert_86' declared with attribute error: Need native word sized stores/loads for atomicity.
     _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
                                         ^
   include/linux/compiler.h:319:4: note: in definition of macro '__compiletime_assert'
       prefix ## suffix();    \
       ^~~~~~
   include/linux/compiler.h:339:2: note: in expansion of macro '_compiletime_assert'
     _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
     ^~~~~~~~~~~~~~~~~~~
   include/linux/compiler.h:342:2: note: in expansion of macro 'compiletime_assert'
     compiletime_assert(__native_word(t),    \
     ^~~~~~~~~~~~~~~~~~
>> arch/x86/include/asm/barrier.h:69:2: note: in expansion of macro 'compiletime_assert_atomic_type'
     compiletime_assert_atomic_type(*p);    \
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> include/asm-generic/barrier.h:157:33: note: in expansion of macro '__smp_store_release'
    #define smp_store_release(p, v) __smp_store_release(p, v)
                                    ^~~~~~~~~~~~~~~~~~~
   kernel//events/ring_buffer.c:86:2: note: in expansion of macro 'smp_store_release'
     smp_store_release(&rb->user_page->data_head, head); /* B, matches C */
     ^~~~~~~~~~~~~~~~~
   kernel//events/ring_buffer.c: In function 'perf_aux_output_skip':
   include/linux/compiler.h:339:38: error: call to '__compiletime_assert_498' declared with attribute error: Need native word sized stores/loads for atomicity.
     _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
                                         ^
   include/linux/compiler.h:319:4: note: in definition of macro '__compiletime_assert'
       prefix ## suffix();    \
       ^~~~~~
   include/linux/compiler.h:339:2: note: in expansion of macro '_compiletime_assert'
     _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
     ^~~~~~~~~~~~~~~~~~~
   include/linux/compiler.h:342:2: note: in expansion of macro 'compiletime_assert'
     compiletime_assert(__native_word(t),    \
     ^~~~~~~~~~~~~~~~~~
>> arch/x86/include/asm/barrier.h:69:2: note: in expansion of macro 'compiletime_assert_atomic_type'
     compiletime_assert_atomic_type(*p);    \
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> include/asm-generic/barrier.h:157:33: note: in expansion of macro '__smp_store_release'
    #define smp_store_release(p, v) __smp_store_release(p, v)
                                    ^~~~~~~~~~~~~~~~~~~
   kernel//events/ring_buffer.c:498:2: note: in expansion of macro 'smp_store_release'
     smp_store_release(&rb->user_page->aux_head, rb->aux_head);
     ^~~~~~~~~~~~~~~~~
   kernel//events/ring_buffer.c: In function 'perf_aux_output_end':
   include/linux/compiler.h:339:38: error: call to '__compiletime_assert_466' declared with attribute error: Need native word sized stores/loads for atomicity.
     _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
                                         ^
   include/linux/compiler.h:319:4: note: in definition of macro '__compiletime_assert'
       prefix ## suffix();    \
       ^~~~~~
   include/linux/compiler.h:339:2: note: in expansion of macro '_compiletime_assert'
     _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
     ^~~~~~~~~~~~~~~~~~~
   include/linux/compiler.h:342:2: note: in expansion of macro 'compiletime_assert'
     compiletime_assert(__native_word(t),    \
     ^~~~~~~~~~~~~~~~~~
>> arch/x86/include/asm/barrier.h:69:2: note: in expansion of macro 'compiletime_assert_atomic_type'
     compiletime_assert_atomic_type(*p);    \
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> include/asm-generic/barrier.h:157:33: note: in expansion of macro '__smp_store_release'
    #define smp_store_release(p, v) __smp_store_release(p, v)
                                    ^~~~~~~~~~~~~~~~~~~
   kernel//events/ring_buffer.c:466:2: note: in expansion of macro 'smp_store_release'
     smp_store_release(&rb->user_page->aux_head, rb->aux_head);
     ^~~~~~~~~~~~~~~~~

vim +/compiletime_assert_atomic_type +69 arch/x86/include/asm/barrier.h

47933ad4 Peter Zijlstra     2013-11-06  66  
1638fb72 Michael S. Tsirkin 2015-12-27  67  #define __smp_store_release(p, v)					\
47933ad4 Peter Zijlstra     2013-11-06  68  do {									\
47933ad4 Peter Zijlstra     2013-11-06 @69  	compiletime_assert_atomic_type(*p);				\
47933ad4 Peter Zijlstra     2013-11-06  70  	barrier();							\
76695af2 Andrey Konovalov   2015-08-02  71  	WRITE_ONCE(*p, v);						\
47933ad4 Peter Zijlstra     2013-11-06  72  } while (0)
47933ad4 Peter Zijlstra     2013-11-06  73  

:::::: The code at line 69 was first introduced by commit
:::::: 47933ad41a86a4a9b50bed7c9b9bd2ba242aac63 arch: Introduce smp_load_acquire(), smp_store_release()

:::::: TO: Peter Zijlstra <peterz@infradead.org>
:::::: 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 index

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-10 13:06 Mark Rutland
2018-05-11  1:19 ` kbuild test robot
2018-05-11  1:19 ` kbuild test robot [this message]
2018-05-11 10:59 ` Mark Rutland
2018-05-11 16:22   ` Peter Zijlstra
2018-05-14 11:05     ` Mark Rutland
2018-05-14 11:28       ` Peter Zijlstra
2018-05-14 15:02         ` Peter Zijlstra
2018-05-14 15:20           ` Mark Rutland
2018-05-14 15:24             ` Peter Zijlstra
2018-05-23 16:42 ` Will Deacon

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