netdev - Re: [PATCH] net/irda: fix lockdep annotation

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Message-ID: <201701162214.BqECKe5z%fengguang.wu@intel.com>
Date:   Mon, 16 Jan 2017 22:11:06 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     kbuild-all@...org, davej@...hat.com, samuel@...tiz.org,
        davem@...emloft.net, glider@...gle.com, andreyknvl@...gle.com,
        Dmitry Vyukov <dvyukov@...gle.com>, netdev@...r.kernel.org
Subject: Re: [PATCH] net/irda: fix lockdep annotation

Hi Dmitry,

[auto build test WARNING on net-next/master]
[also build test WARNING on v4.10-rc4 next-20170116]
[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/Dmitry-Vyukov/net-irda-fix-lockdep-annotation/20170116-183405
config: x86_64-randconfig-s2-01161850 (attached as .config)
compiler: gcc-4.4 (Debian 4.4.7-8) 4.4.7
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

   net/irda/irqueue.c: In function 'hashbin_delete':
>> net/irda/irqueue.c:393: warning: unused variable 'depth'
   At top level:
   cc1: warning: unrecognized command line option "-Wno-maybe-uninitialized"

vim +/depth +393 net/irda/irqueue.c

   377	
   378	
   379	/*
   380	 * Function hashbin_delete (hashbin, free_func)
   381	 *
   382	 *    Destroy hashbin, the free_func can be a user supplied special routine
   383	 *    for deallocating this structure if it's complex. If not the user can
   384	 *    just supply kfree, which should take care of the job.
   385	 */
   386	#ifdef CONFIG_LOCKDEP
   387	static atomic_t hashbin_lock_depth = ATOMIC_INIT(0);
   388	#endif
   389	int hashbin_delete( hashbin_t* hashbin, FREE_FUNC free_func)
   390	{
   391		irda_queue_t* queue;
   392		unsigned long flags = 0;
 > 393		int i, depth = 0;
   394	
   395		IRDA_ASSERT(hashbin != NULL, return -1;);
   396		IRDA_ASSERT(hashbin->magic == HB_MAGIC, return -1;);
   397	
   398		/* Synchronize */
   399		if ( hashbin->hb_type & HB_LOCK ) {
   400	#ifdef CONFIG_LOCKDEP
   401			depth = atomic_inc_return(&hashbin_lock_depth) - 1;

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

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