linux-kernel - Re: [PATCH 1/2] pci: Convert to use built-in RCU list checking

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Date:   Wed, 4 Sep 2019 12:06:43 +0800
From:   kbuild test robot <lkp@...el.com>
To:     "Joel Fernandes (Google)" <joel@...lfernandes.org>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        "Joel Fernandes (Google)" <joel@...lfernandes.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Catalin Marinas <catalin.marinas@....com>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Jonathan Derrick <jonathan.derrick@...el.com>,
        Keith Busch <keith.busch@...el.com>, linux-pci@...r.kernel.org,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Subject: Re: [PATCH 1/2] pci: Convert to use built-in RCU list checking

Hi "Joel,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[cannot apply to v5.3-rc7 next-20190903]
[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/Joel-Fernandes-Google/pci-Convert-to-use-built-in-RCU-list-checking/20190901-211013
config: x86_64-rhel-7.6 (attached as .config)
compiler: gcc-7 (Debian 7.4.0-11) 7.4.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

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

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

   drivers/pci/controller/vmd.c: In function 'vmd_irq':
>> drivers/pci/controller/vmd.c:722:37: error: macro "list_for_each_entry_rcu" passed 4 arguments, but takes just 3
        srcu_read_lock_held(&irqs->srcu))
                                        ^
>> drivers/pci/controller/vmd.c:721:2: error: unknown type name 'list_for_each_entry_rcu'
     list_for_each_entry_rcu(vmdirq, &irqs->irq_list, node,
     ^~~~~~~~~~~~~~~~~~~~~~~
>> drivers/pci/controller/vmd.c:723:28: error: expected ')' before '->' token
      generic_handle_irq(vmdirq->virq);
                               ^~
>> drivers/pci/controller/vmd.c:721:2: warning: ISO C90 forbids mixed declarations and code [-Wdeclaration-after-statement]
     list_for_each_entry_rcu(vmdirq, &irqs->irq_list, node,
     ^~~~~~~~~~~~~~~~~~~~~~~
   drivers/pci/controller/vmd.c:717:18: warning: unused variable 'vmdirq' [-Wunused-variable]
     struct vmd_irq *vmdirq;
                     ^~~~~~

vim +/list_for_each_entry_rcu +722 drivers/pci/controller/vmd.c

   713	
   714	static irqreturn_t vmd_irq(int irq, void *data)
   715	{
   716		struct vmd_irq_list *irqs = data;
   717		struct vmd_irq *vmdirq;
   718		int idx;
   719	
   720		idx = srcu_read_lock(&irqs->srcu);
 > 721		list_for_each_entry_rcu(vmdirq, &irqs->irq_list, node,
 > 722					srcu_read_lock_held(&irqs->srcu))
 > 723			generic_handle_irq(vmdirq->virq);
   724		srcu_read_unlock(&irqs->srcu, idx);
   725	
   726		return IRQ_HANDLED;
   727	}
   728	

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