linux-kernel - Re: [PATCH v2 1/3] locking/spinlock_debug: Reduce lockup suspected message clutter

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Date:   Thu, 2 Feb 2017 10:21:03 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Waiman Long <longman@...hat.com>
Cc:     kbuild-all@...org, Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        Waiman Long <longman@...hat.com>
Subject: Re: [PATCH v2 1/3] locking/spinlock_debug: Reduce lockup suspected
 message clutter

Hi Waiman,

[auto build test ERROR on tip/locking/core]
[also build test ERROR on v4.10-rc6 next-20170201]
[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/Waiman-Long/locking-spinlock_debug-Change-it-to-a-mostly-fair-lock/20170202-052215
config: arm-omap2plus_defconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=arm 

All errors (new ones prefixed by >>):

   kernel/built-in.o: In function `do_raw_spin_lock':
>> arch/arm/include/asm/cmpxchg.h:109: undefined reference to `__bad_xchg'
>> kernel/built-in.o:(.debug_addr+0x28c6c): undefined reference to `__bad_xchg'

vim +109 arch/arm/include/asm/cmpxchg.h

9f97da78 David Howells 2012-03-28   93  		asm volatile("@	__xchg1\n"
9f97da78 David Howells 2012-03-28   94  		"	swpb	%0, %1, [%2]"
9f97da78 David Howells 2012-03-28   95  			: "=&r" (ret)
9f97da78 David Howells 2012-03-28   96  			: "r" (x), "r" (ptr)
9f97da78 David Howells 2012-03-28   97  			: "memory", "cc");
9f97da78 David Howells 2012-03-28   98  		break;
9f97da78 David Howells 2012-03-28   99  	case 4:
9f97da78 David Howells 2012-03-28  100  		asm volatile("@	__xchg4\n"
9f97da78 David Howells 2012-03-28  101  		"	swp	%0, %1, [%2]"
9f97da78 David Howells 2012-03-28  102  			: "=&r" (ret)
9f97da78 David Howells 2012-03-28  103  			: "r" (x), "r" (ptr)
9f97da78 David Howells 2012-03-28  104  			: "memory", "cc");
9f97da78 David Howells 2012-03-28  105  		break;
9f97da78 David Howells 2012-03-28  106  #endif
9f97da78 David Howells 2012-03-28  107  	default:
31cd08c3 Russell King  2015-05-19  108  		/* Cause a link-time error, the xchg() size is not supported */
9f97da78 David Howells 2012-03-28 @109  		__bad_xchg(ptr, size), ret = 0;
9f97da78 David Howells 2012-03-28  110  		break;
9f97da78 David Howells 2012-03-28  111  	}
9f97da78 David Howells 2012-03-28  112  
9f97da78 David Howells 2012-03-28  113  	return ret;
9f97da78 David Howells 2012-03-28  114  }
9f97da78 David Howells 2012-03-28  115  
0ca326de Will Deacon   2015-08-06  116  #define xchg_relaxed(ptr, x) ({						\
e001bbae Russell King  2015-05-26  117  	(__typeof__(*(ptr)))__xchg((unsigned long)(x), (ptr),		\

:::::: The code at line 109 was first introduced by commit
:::::: 9f97da78bf018206fb623cd351d454af2f105fe0 Disintegrate asm/system.h for ARM

:::::: TO: David Howells <dhowells@...hat.com>
:::::: CC: David Howells <dhowells@...hat.com>

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