linux-mm.kvack.org archive mirror
 help / color / mirror / Atom feed
From: Mel Gorman <mgorman@techsingularity.net>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Linux-MM <linux-mm@kvack.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Mel Gorman <mgorman@techsingularity.net>
Subject: [PATCH 2/3] mm, meminit: Always return a valid node from early_pfn_to_nid
Date: Fri,  8 Jul 2016 21:00:30 +0100	[thread overview]
Message-ID: <1468008031-3848-3-git-send-email-mgorman@techsingularity.net> (raw)
In-Reply-To: <1468008031-3848-1-git-send-email-mgorman@techsingularity.net>

early_pfn_to_nid can return node 0 if a PFN is invalid on machines
that has no node 0. A machine with only node 1 was observed to crash
with the following message

 BUG: unable to handle kernel paging request at 000000000002a3c8
 PGD 0
 Modules linked in:
 Hardware name: Supermicro H8DSP-8/H8DSP-8, BIOS 080011  06/30/2006
 task: ffffffff81c0d500 ti: ffffffff81c00000 task.ti: ffffffff81c00000
 RIP: 0010:[<ffffffff816dbd63>]  [<ffffffff816dbd63>] reserve_bootmem_region+0x6a/0xef
 RSP: 0000:ffffffff81c03eb0  EFLAGS: 00010086
 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
 RDX: ffffffff81c03ec0 RSI: ffffffff81d205c0 RDI: ffffffff8213ee60
 R13: ffffea0000000000 R14: ffffea0000000020 R15: ffffea0000000020
 FS:  0000000000000000(0000) GS:ffff8800fba00000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 CR2: 000000000002a3c8 CR3: 0000000001c06000 CR4: 00000000000006b0
 Stack:
  ffffffff81c03f00 0000000000000400 ffff8800fbfc3200 ffffffff81e2a2c0
  ffffffff81c03fb0 ffffffff81c03f20 ffffffff81dadf7d ffffea0002000040
  ffffea0000000000 0000000000000000 000000000000ffff 0000000000000001
 Call Trace:
  [<ffffffff81dadf7d>] free_all_bootmem+0x4b/0x12a
  [<ffffffff81d97122>] mem_init+0x70/0xa3
  [<ffffffff81d78f21>] start_kernel+0x25b/0x49b

The problem is that early_page_uninitialised uses the early_pfn_to_nid
helper which returns node 0 for invalid PFNs. No caller of early_pfn_to_nid
cares except early_page_uninitialised. This patch has early_pfn_to_nid
always return a valid node.

Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Cc: <stable@vger.kernel.org> # 4.2+
---
 mm/page_alloc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index a19527aa4243..5a616de1adca 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1097,7 +1097,7 @@ int __meminit early_pfn_to_nid(unsigned long pfn)
 	spin_lock(&early_pfn_lock);
 	nid = __early_pfn_to_nid(pfn, &early_pfnnid_cache);
 	if (nid < 0)
-		nid = 0;
+		nid = first_online_node;
 	spin_unlock(&early_pfn_lock);
 
 	return nid;
-- 
2.6.4

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>

  parent reply	other threads:[~2016-07-08 20:00 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-07-08 20:00 [PATCH 0/3] Fix boot problem with deferred meminit on machine with no node 0 Mel Gorman
2016-07-08 20:00 ` [PATCH 1/3] mm, meminit: Remove early_page_nid_uninitialised Mel Gorman
2016-07-08 20:00 ` Mel Gorman [this message]
2016-07-12 23:26   ` [PATCH 2/3] mm, meminit: Always return a valid node from early_pfn_to_nid David Rientjes
2016-07-13 10:34     ` Mel Gorman
2016-07-08 20:00 ` [PATCH 3/3] mm, meminit: Ensure node is online before checking whether pages are uninitialised Mel Gorman
2016-07-12 23:28   ` David Rientjes

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1468008031-3848-3-git-send-email-mgorman@techsingularity.net \
    --to=mgorman@techsingularity.net \
    --cc=akpm@linux-foundation.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mm@kvack.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).