linux-kernel - Re: Commit 911af505 introduced a bootmem warning.

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Date:	Wed, 15 May 2013 10:58:15 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Robin Holt <holt@....com>
Cc:	"Paul E. McKenney" <paul.mckenney@...aro.org>,
	linux-kernel@...r.kernel.org
Subject: Re: Commit 911af505 introduced a bootmem warning.

On Wed, May 15, 2013 at 10:33:48AM -0500, Robin Holt wrote:
> On Wed, May 15, 2013 at 07:32:49AM -0700, Paul E. McKenney wrote:
> > On Wed, May 15, 2013 at 02:57:42AM -0500, Robin Holt wrote:
> > > Paul,
> > > 
> > > When we boot Linus' current kernel we get the following warning early
> > > in boot:
> > > 
> > > ----------------------------------------------------------------------
> > > [    0.000000] Memory: 63081268k/99598336k available (4832k kernel code, 34651396k absent, 1865672k reserved, 6269k data,
> > > 1672k init)
> > > [    0.000000] Hierarchical RCU implementation.
> > > [    0.000000]  RCU dyntick-idle grace-period acceleration is enabled.
> > > [    0.000000]  RCU restricting CPUs from NR_CPUS=4096 to nr_cpu_ids=32.
> > > [    0.000000] ------------[ cut here ]------------
> > > [    0.000000] WARNING: at mm/nobootmem.c:215 ___alloc_bootmem_nopanic+0x79/0x82()
> > > [    0.000000] Modules linked in:
> > > [    0.000000] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.10.0-rc1-uv-hz100-rja+ #3
> > > [    0.000000] Hardware name: SGI UV2000/ROMLEY, BIOS SGI UV 2000/3000 series BIOS 01/15/2013
> > > [    0.000000]  00000000000000d7 ffffffff81a01e38 ffffffff814a873c ffffffff81a01e78
> > > [    0.000000]  ffffffff81045a7b ffffffff81ced5a2 0000000000000000 ffffffffffffffff
> > > [    0.000000]  0000000000000040 0000000000000200 0000000067da2bfc ffffffff81a01e88
> > > [    0.000000] Call Trace:
> > > [    0.000000]  [<ffffffff814a873c>] dump_stack+0x19/0x1d
> > > [    0.000000]  [<ffffffff81045a7b>] warn_slowpath_common+0x6b/0xa0
> > > [    0.000000]  [<ffffffff81045ac5>] warn_slowpath_null+0x15/0x20
> > > [    0.000000]  [<ffffffff81b1793a>] ___alloc_bootmem_nopanic+0x79/0x82
> > > [    0.000000]  [<ffffffff81b17a59>] ___alloc_bootmem+0x11/0x3c
> > > [    0.000000]  [<ffffffff81b17aa4>] __alloc_bootmem+0x10/0x12
> > > [    0.000000]  [<ffffffff81b233a7>] alloc_bootmem_cpumask_var+0x1d/0x27
> > > [    0.000000]  [<ffffffff81b1119b>] rcu_bootup_announce_oddness+0xd0/0x153
> > > [    0.000000]  [<ffffffff81b11735>] rcu_init+0x1e/0x1e6
> > > [    0.000000]  [<ffffffff81aedf2f>] start_kernel+0x1e6/0x43c
> > > [    0.000000]  [<ffffffff81aedb3b>] ? repair_env_string+0x58/0x58
> > > [    0.000000]  [<ffffffff81aed4d1>] x86_64_start_reservations+0x1b/0x32
> > > [    0.000000]  [<ffffffff81aed612>] x86_64_start_kernel+0x12a/0x131
> > > [    0.000000] ---[ end trace c8b13488e92fad65 ]---
> > > [    0.000000]  Experimental no-CBs for all CPUs
> > > [    0.000000]  Experimental no-CBs CPUs: 0-31.
> > > [    0.000000] NO_HZ: Full dynticks CPUs: 1-31.
> > 
> > Could you please try the following patch and let me know if it helps?
> > 
> > 								Thanx, Paul
> > 
> > ------------------------------------------------------------------------
> > 
> > rcu: Don't allocate bootmem from rcu_init()
> > 
> > When rcu_init() is called we already have slab working, allocating
> > bootmem at that point results in warnings and an allocation from
> > slab.  This commit therefore changes alloc_bootmem_cpumask_var() to
> > alloc_cpumask_var() in rcu_bootup_announce_oddness(), which is called
> > from rcu_init().
> > 
> > Signed-off-by: Sasha Levin <sasha.levin@...cle.com>
> > Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> > Reviewed-by: Josh Triplett <josh@...htriplett.org>
> 
> Tested-by: Robin Holt <holt@....com>
> 
> Works great.

Thank you, queued for 3.10 as a regression.

								Thanx, Paul

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