linux-kernel - Re: [PATCH v3] mm: make expand_downwards symmetrical to expand

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Date:	Wed, 20 Apr 2011 14:18:54 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	James Bottomley <James.Bottomley@...senpartnership.com>
cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Pekka Enberg <penberg@...nel.org>,
	Christoph Lameter <cl@...ux.com>,
	Michal Hocko <mhocko@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>,
	linux-parisc@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	x86 maintainers <x86@...nel.org>
Subject: Re: [PATCH v3] mm: make expand_downwards symmetrical to
 expand_upwards

On Wed, 20 Apr 2011, James Bottomley wrote:

> [    0.200000] Backtrace:
> [    0.200000]  [<000000004021c938>] add_partial+0x28/0x98
> [    0.200000]  [<000000004021faa0>] __slab_free+0x1d0/0x1d8
> [    0.200000]  [<000000004021fd04>] kmem_cache_free+0xc4/0x128
> [    0.200000]  [<000000004033bf9c>] ida_get_new_above+0x21c/0x2c0
> [    0.200000]  [<00000000402a8980>] sysfs_new_dirent+0xd0/0x238
> [    0.200000]  [<00000000402a974c>] create_dir+0x5c/0x168
> [    0.200000]  [<00000000402a9ab0>] sysfs_create_dir+0x98/0x128
> [    0.200000]  [<000000004033d6c4>] kobject_add_internal+0x114/0x258
> [    0.200000]  [<000000004033d9ac>] kobject_add_varg+0x7c/0xa0
> [    0.200000]  [<000000004033df20>] kobject_add+0x50/0x90
> [    0.200000]  [<000000004033dfb4>] kobject_create_and_add+0x54/0xc8
> [    0.200000]  [<00000000407862a0>] cgroup_init+0x138/0x1f0
> [    0.200000]  [<000000004077ce50>] start_kernel+0x5a0/0x840
> [    0.200000]  [<000000004011fa3c>] start_parisc+0xa4/0xb8
> [    0.200000]  [<00000000404bb034>] packet_ioctl+0x16c/0x208
> [    0.200000]  [<000000004049ac30>] ip_mroute_setsockopt+0x260/0xf20
> [    0.200000] 

This is probably because the parisc's DISCONTIGMEM memory ranges don't 
have bits set in N_NORMAL_MEMORY.

diff --git a/arch/parisc/mm/init.c b/arch/parisc/mm/init.c
--- a/arch/parisc/mm/init.c
+++ b/arch/parisc/mm/init.c
@@ -266,8 +266,10 @@ static void __init setup_bootmem(void)
 	}
 	memset(pfnnid_map, 0xff, sizeof(pfnnid_map));
 
-	for (i = 0; i < npmem_ranges; i++)
+	for (i = 0; i < npmem_ranges; i++) {
+		node_set_state(i, N_NORMAL_MEMORY);
 		node_set_online(i);
+	}
 #endif
 
 	/*
--
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