linux-kernel - Re: [BUG] 2.6.26-rc1 hangs during boot on UltraSPARC 5

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Message-Id: <20080506.152042.91330094.davem@davemloft.net>
Date:	Tue, 06 May 2008 15:20:42 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	mikpe@...uu.se
Cc:	sparclinux@...r.kernel.org, linux-kernel@...r.kernel.org,
	armin76@...too.org
Subject: Re: [BUG] 2.6.26-rc1 hangs during boot on UltraSPARC 5

From: Mikael Pettersson <mikpe@...uu.se>
Date: Tue, 6 May 2008 21:38:24 +0200

> I removed "| CON_BOOT" and got what looks like the same oops
> Raúl Porcel reported earlier today (which he for some reason
> sent only to the lists, not to you or me); his oops was:

I can reproduce this problem here in my t1000.

It looks like some kind of initrd regression.

Looking at the crashes, the kernel seems to be trying
to dereference a physical address when peeking at the
initrd instead of using a virtual one.  That's a big
clue.

This patch should fix it:

commit d45100f7b69e3d9cd0cd5e956b6ac2c78d460d07
Author: David S. Miller <davem@...emloft.net>
Date:   Tue May 6 15:19:54 2008 -0700

    sparc64: Fix initrd regression.
    
    We die because we forget to convert initrd_start and
    initrd_end to virtual addresses.
    
    Reported by Mikael Pettersson
    
    Signed-off-by: David S. Miller <davem@...emloft.net>

diff --git a/arch/sparc64/mm/init.c b/arch/sparc64/mm/init.c
index db8e7fb..ec3e2c7 100644
--- a/arch/sparc64/mm/init.c
+++ b/arch/sparc64/mm/init.c
@@ -771,6 +771,9 @@ static void __init find_ramdisk(unsigned long phys_base)
 		initrd_end = ramdisk_image + sparc_ramdisk_size;
 
 		lmb_reserve(initrd_start, initrd_end);
+
+		initrd_start += PAGE_OFFSET;
+		initrd_end += PAGE_OFFSET;
 	}
 #endif
 }

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