linux-kernel - Re: [PATCH] dmaengine: ipu: Revert ipu_irq

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Date:   Fri, 23 Dec 2016 22:37:22 +0800
From:   kbuild test robot <lkp@...el.com>
To:     ivan.stoyanov@...-drives.bg
Cc:     kbuild-all@...org, vinod.koul@...el.com, arnd@...db.de,
        dan.j.williams@...el.com, dmaengine@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Ivan Stoyanov <ivan.stoyanov@...-drives.bg>
Subject: Re: [PATCH] dmaengine: ipu: Revert ipu_irq_handler changes.

Hi Ivan,

[auto build test WARNING on linus/master]
[also build test WARNING on v4.9 next-20161223]
[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/ivan-stoyanov-amk-drives-bg/dmaengine-ipu-Revert-ipu_irq_handler-changes/20161223-211424
config: arm-multi_v5_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 

Note: it may well be a FALSE warning. FWIW you are at least aware of it now.
http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings

All warnings (new ones prefixed by >>):

   drivers/dma/ipu/ipu_irq.c: In function 'ipu_irq_fn':
>> drivers/dma/ipu/ipu_irq.c:342:4: warning: 'irq' may be used uninitialized in this function [-Wmaybe-uninitialized]
       generic_handle_irq(irq);
       ^~~~~~~~~~~~~~~~~~~~~~~

vim +/irq +342 drivers/dma/ipu/ipu_irq.c

   326				unsigned int irq;
   327	
   328				line--;
   329				status &= ~(1UL << line);
   330	
   331				raw_spin_lock(&bank_lock);
   332				map = src2map(32 * i + line);
   333				if (map)
   334					irq = map->irq;
   335				raw_spin_unlock(&bank_lock);
   336	
   337				if (!map) {
   338					pr_err("IPU: Interrupt on unmapped source %u bank %d\n",
   339					       line, i);
   340					continue;
   341				}
 > 342				generic_handle_irq(irq);
   343			}
   344		}
   345	}
   346	
   347	static struct irq_chip ipu_irq_chip = {
   348		.name		= "ipu_irq",
   349		.irq_ack	= ipu_irq_ack,
   350		.irq_mask	= ipu_irq_mask,

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

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