linux-kernel - drivers/iommu/sun50i-iommu.c:890:14: warning: variable 'iova' set but not used

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Message-ID: <202008252124.wO0XX6AA%lkp@intel.com>
Date:   Tue, 25 Aug 2020 21:58:28 +0800
From:   kernel test robot <lkp@...el.com>
To:     Maxime Ripard <maxime@...no.tech>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Joerg Roedel <jroedel@...e.de>
Subject: drivers/iommu/sun50i-iommu.c:890:14: warning: variable 'iova' set
 but not used

Hi Maxime,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   6a9dc5fd6170d0a41c8a14eb19e63d94bea5705a
commit: 4100b8c229b328358cc4a82f5042dbf22f1c1ccb iommu: Add Allwinner H6 IOMMU driver
date:   3 months ago
config: i386-randconfig-r015-20200825 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce (this is a W=1 build):
        git checkout 4100b8c229b328358cc4a82f5042dbf22f1c1ccb
        # save the attached .config to linux build tree
        make W=1 ARCH=i386 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

   drivers/iommu/sun50i-iommu.c: In function 'sun50i_dte_get_page_table':
   drivers/iommu/sun50i-iommu.c:486:16: warning: unused variable 'flags' [-Wunused-variable]
     486 |  unsigned long flags;
         |                ^~~~~
   drivers/iommu/sun50i-iommu.c: In function 'sun50i_iommu_unmap':
   drivers/iommu/sun50i-iommu.c:561:13: warning: variable 'pte_dma' set but not used [-Wunused-but-set-variable]
     561 |  dma_addr_t pte_dma;
         |             ^~~~~~~
   drivers/iommu/sun50i-iommu.c:559:23: warning: unused variable 'iommu' [-Wunused-variable]
     559 |  struct sun50i_iommu *iommu = sun50i_domain->iommu;
         |                       ^~~~~
   drivers/iommu/sun50i-iommu.c: In function 'sun50i_iommu_probe_device':
   drivers/iommu/sun50i-iommu.c:749:22: warning: unused variable 'group' [-Wunused-variable]
     749 |  struct iommu_group *group;
         |                      ^~~~~
   drivers/iommu/sun50i-iommu.c: In function 'sun50i_iommu_irq':
>> drivers/iommu/sun50i-iommu.c:890:14: warning: variable 'iova' set but not used [-Wunused-but-set-variable]
     890 |  phys_addr_t iova;
         |              ^~~~

# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4100b8c229b328358cc4a82f5042dbf22f1c1ccb
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout 4100b8c229b328358cc4a82f5042dbf22f1c1ccb
vim +/iova +890 drivers/iommu/sun50i-iommu.c

   886	
   887	static irqreturn_t sun50i_iommu_irq(int irq, void *dev_id)
   888	{
   889		struct sun50i_iommu *iommu = dev_id;
 > 890		phys_addr_t iova;
   891		u32 status;
   892	
   893		spin_lock(&iommu->iommu_lock);
   894	
   895		status = iommu_read(iommu, IOMMU_INT_STA_REG);
   896		if (!(status & IOMMU_INT_MASK)) {
   897			spin_unlock(&iommu->iommu_lock);
   898			return IRQ_NONE;
   899		}
   900	
   901		if (status & IOMMU_INT_INVALID_L2PG)
   902			iova = sun50i_iommu_handle_pt_irq(iommu,
   903							  IOMMU_INT_ERR_ADDR_L2_REG,
   904							  IOMMU_L2PG_INT_REG);
   905		else if (status & IOMMU_INT_INVALID_L1PG)
   906			iova = sun50i_iommu_handle_pt_irq(iommu,
   907							  IOMMU_INT_ERR_ADDR_L1_REG,
   908							  IOMMU_L1PG_INT_REG);
   909		else
   910			iova = sun50i_iommu_handle_perm_irq(iommu);
   911	
   912		iommu_write(iommu, IOMMU_INT_CLR_REG, status);
   913	
   914		iommu_write(iommu, IOMMU_RESET_REG, ~status);
   915		iommu_write(iommu, IOMMU_RESET_REG, status);
   916	
   917		spin_unlock(&iommu->iommu_lock);
   918	
   919		return IRQ_HANDLED;
   920	}
   921	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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