linux-kernel - Re: [PATCH] Fix early

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Date:	Sun, 20 Jan 2008 19:04:32 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	mingo@...e.hu, Jeremy Fitzhardinge <jeremy@...p.org>,
	tglx@...utronix.de, linux-kernel@...r.kernel.org,
	venkatesh.pallipadi@...el.com
Subject: Re: [PATCH] Fix early_ioremap on x86-64 II

> This patch changes all flushes in init_64.c to be __flush_tlb_all()
> and fixes the problem here.

Hmm, I see new early crashes with that patch here in some cases unfortunately:

PANIC: early exception 06 rip 10:ffffffff8082df2d error 0 cr2 0
Pid: 0, comm: swapper Not tainted 2.6.24-rc8-g7ada4254 #39

Call Trace:
 [<ffffffff8082df2d>] free_bootmem_core+0x1a/0x6b
 [<ffffffff8082f143>] free_bootmem_with_active_regions+0x51/0x67
 [<ffffffff8082a0f3>] setup_node_bootmem+0x16b/0x1b3
 [<ffffffff8082b3a4>] acpi_scan_nodes+0x136/0x230
 [<ffffffff8082a6bb>] numa_initmem_init+0x331/0x459
 [<ffffffff80234ef6>] release_console_sem+0x1b4/0x1cd
 [<ffffffff80234ef6>] release_console_sem+0x1b4/0x1cd
 [<ffffffff80355726>] number+0x10e/0x1f9
 [<ffffffff802354d8>] printk+0x4e/0x56
 [<ffffffff80355726>] number+0x10e/0x1f9
 [<ffffffff803563f8>] vsnprintf+0x53f/0x583
 [<ffffffff80355726>] number+0x10e/0x1f9
 [<ffffffff80234ef6>] release_console_sem+0x1b4/0x1cd
 [<ffffffff803563f8>] vsnprintf+0x53f/0x583
 [<ffffffff8022468a>] early_serial_write+0x22/0x32

Not sure what's going wrong. I think the patch is correct, but there
are probably more bugs around triggered by some change. Perhaps it is 
better to just revert Jeremy's patch (789bad4ca2b604f2f21ae7e3d64b67325ec8f9bb) for now.

-Andi
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