linux-kernel - Re: [PATCH RT] mm: backing-dev: don't disable IRQs in wb_congested

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Date:	Tue, 9 Feb 2016 00:49:51 +0800
From:	kbuild test robot <lkp@...el.com>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:	kbuild-all@...org, linux-rt-users@...r.kernel.org,
	linux-kernel@...r.kernel.org, tglx@...utronix.de,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH RT] mm: backing-dev: don't disable IRQs in
 wb_congested_put()

Hi Sebastian,

[auto build test ERROR on v4.5-rc3]
[also build test ERROR on next-20160208]
[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/Sebastian-Andrzej-Siewior/mm-backing-dev-don-t-disable-IRQs-in-wb_congested_put/20160209-003634
config: x86_64-randconfig-x011-201606 (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All error/warnings (new ones prefixed by >>):

   mm/backing-dev.c: In function 'wb_congested_put':
>> mm/backing-dev.c:460:2: error: implicit declaration of function 'local_irq_save_nort' [-Werror=implicit-function-declaration]
     local_irq_save_nort(flags);
     ^
>> mm/backing-dev.c:462:3: error: implicit declaration of function 'local_irq_restore_nort' [-Werror=implicit-function-declaration]
      local_irq_restore_nort(flags);
      ^
>> mm/backing-dev.c:460:2: warning: 'flags' is used uninitialized in this function [-Wuninitialized]
     local_irq_save_nort(flags);
     ^
   cc1: some warnings being treated as errors

vim +/local_irq_save_nort +460 mm/backing-dev.c

   454	 * Put @congested and destroy it if the refcnt reaches zero.
   455	 */
   456	void wb_congested_put(struct bdi_writeback_congested *congested)
   457	{
   458		unsigned long flags;
   459	
 > 460		local_irq_save_nort(flags);
   461		if (!atomic_dec_and_lock(&congested->refcnt, &cgwb_lock)) {
 > 462			local_irq_restore_nort(flags);
   463			return;
   464		}
   465	

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