linux-kernel - Re: [PATCH 3/3] radix-tree: support locking of individual exception entries.

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Message-ID: <201602281346.L3iqRWKF%fengguang.wu@intel.com>
Date:	Sun, 28 Feb 2016 13:30:46 +0800
From:	kbuild test robot <lkp@...el.com>
To:	NeilBrown <neilb@...e.com>
Cc:	kbuild-all@...org, Ross Zwisler <ross.zwisler@...ux.intel.com>,
	Matthew Wilcox <matthew.r.wilcox@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jan Kara <jack@...e.cz>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 3/3] radix-tree: support locking of individual exception
 entries.

Hi NeilBrown,

[auto build test ERROR on v4.5-rc5]
[also build test ERROR on next-20160226]
[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/NeilBrown/RFC-improvements-to-radix-tree-related-to-DAX/20160228-132214
config: i386-tinyconfig (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   lib/radix-tree.c: In function 'radix_tree_lookup_lock':
>> lib/radix-tree.c:1616:5: error: 'TASK_UNINTERRUPTIBLE' undeclared (first use in this function)
        TASK_UNINTERRUPTIBLE);
        ^
   lib/radix-tree.c:1616:5: note: each undeclared identifier is reported only once for each function it appears in
>> lib/radix-tree.c:1621:3: error: implicit declaration of function 'schedule' [-Werror=implicit-function-declaration]
      schedule();
      ^
   lib/radix-tree.c: In function 'radix_tree_unlock':
>> lib/radix-tree.c:1644:17: error: 'TASK_NORMAL' undeclared (first use in this function)
      __wake_up(wq, TASK_NORMAL, 1, &key);
                    ^
   lib/radix-tree.c: In function 'radix_tree_delete_unlock':
   lib/radix-tree.c:1657:17: error: 'TASK_NORMAL' undeclared (first use in this function)
      __wake_up(wq, TASK_NORMAL, 1, &key);
                    ^
   cc1: some warnings being treated as errors

vim +/TASK_UNINTERRUPTIBLE +1616 lib/radix-tree.c

  1610		wait.state = SLOT_WAITING;
  1611		wait.root = root;
  1612		wait.index = index;
  1613		wait.ret = NULL;
  1614		for (;;) {
  1615			prepare_to_wait(wq, &wait.wait,
> 1616					TASK_UNINTERRUPTIBLE);
  1617			if (wait.state != SLOT_WAITING)
  1618				break;
  1619	
  1620			spin_unlock(lock);
> 1621			schedule();
  1622			spin_lock(lock);
  1623		}
  1624		finish_wait(wq, &wait.wait);
  1625		return wait.ret;
  1626	}
  1627	EXPORT_SYMBOL(radix_tree_lookup_lock);
  1628	
  1629	void radix_tree_unlock(struct radix_tree_root *root, wait_queue_head_t *wq,
  1630				unsigned long index)
  1631	{
  1632		void *ret, **slot;
  1633	
  1634		ret = __radix_tree_lookup(root, index, NULL, &slot);
  1635		if (WARN_ON_ONCE(!ret || !radix_tree_exceptional_entry(ret)))
  1636			return;
  1637		if (WARN_ON_ONCE(!slot_locked(slot)))
  1638			return;
  1639		unlock_slot(slot);
  1640	
  1641		if (waitqueue_active(wq)) {
  1642			struct wait_bit_key key = {.flags = root, .bit_nr = -2,
  1643						   .timeout = index};
> 1644			__wake_up(wq, TASK_NORMAL, 1, &key);
  1645		}
  1646	}
  1647	EXPORT_SYMBOL(radix_tree_unlock);

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