Re: [PATCH] numa, mem-hotplug: Fix stack overflow in numa whenseting kernel nodes to unhotpluggable.

[Dave Jones]

On Wed, Jan 22, 2014 at 10:15:51PM -0800, David Rientjes wrote:
 > On Thu, 23 Jan 2014, Dave Jones wrote:
 > 
 > > It's 10, because I had MAXSMP set.
 > > 
 > > So, MAX_NUMNODES = 1 << 10
 > > 
 > > And the bitmask is made of longs. 1024 of them.
 > > 
 > > How does this work ?
 > > 
 > 
 > It's 1024 bits.

ok, I got lost in the maze of macros.

128 bytes is a pretty small amount of stack though, so I'm just as confused
as to what the actual bug here is.


After trying the proposed fix, I got another oops in the early init code..

<trace>
nr_free_zone_pages
nr_free_pagecache_pages
build_all_zonelists
start_kernel
<rip> ffffffffbc164b1e next_zones_zonelist
<rsp> ffffffffbcc01f00

I'll poke at it more in the morning. Too sleepy.

	Dave

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