netdev - Re: [PATCH v2 net-next] bonding: make slave status notifications GFP

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Date:	Thu, 06 Mar 2014 14:56:55 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	vfalico@...hat.com
Cc:	netdev@...r.kernel.org, thomas@...nzmann.de,
	dingtianhong@...wei.com, fubar@...ibm.com, andy@...yhouse.net
Subject: Re: [PATCH v2 net-next] bonding: make slave status notifications
 GFP_ATOMIC

From: Veaceslav Falico <vfalico@...hat.com>
Date: Thu,  6 Mar 2014 15:33:22 +0100

> Currently we're using GFP_KERNEL, however there are some path(s) where we
> can hold some spinlocks, specifically bond->curr_slave_lock:
> 
> [    4.722916] BUG: sleeping function called from invalid context at mm/slub.c:965
> [    4.724438] in_atomic(): 1, irqs_disabled(): 0, pid: 940, name: ifup-eth
> [    4.726034] 5 locks held by ifup-eth/940:
> ...snip...
> [    4.734646]  #4:  (&bond->curr_slave_lock){+...+.}, at: [<ffffffffa00badc6>] bond_enslave+0xda6/0xdd0 [bonding]
> ...snip...
> [    4.759081]  [<ffffffffa00b6f11>] bond_change_active_slave+0x191/0x3b0 [bonding]
> [    4.760917]  [<ffffffffa00b7227>] bond_select_active_slave+0xf7/0x1d0 [bonding]
> [    4.762751]  [<ffffffffa00badce>] bond_enslave+0xdae/0xdd0 [bonding]
> ...snip...
> 
> As it's out of hot path and is a really rare event - change the gfp_t flags
> to GFP_ATOMIC to avoid sleeping under spinlock.
> 
> v2: convert new notify calls to GFP_ATOMIC.
> 
> CC: Thomas Glanzmann <thomas@...nzmann.de>
> CC: Ding Tianhong <dingtianhong@...wei.com>
> CC: Jay Vosburgh <fubar@...ibm.com>
> CC: Andy Gospodarek <andy@...yhouse.net>
> Signed-off-by: Veaceslav Falico <vfalico@...hat.com>

Applied, thanks.
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