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.le...@oracle.com>
> > Signed-off-by: Paul E. McKenney <paul...@linux.vnet.ibm.com>
> > Reviewed-by: Josh Triplett <j...@joshtriplett.org>
>
> Tested-by: Robin Holt <h...@sgi.com>
>
> Works great.
Thank you, queued for 3.10 as a regression.
Thanx, Paul
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
