linux-kernel - WARNING at arch/x86/mm/ioremap.c:469 (early_ioremap

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Message-ID: <20080913003338.GA15185@pest>
Date:	Sat, 13 Sep 2008 02:33:38 +0200
From:	Bernhard Schmidt <berni@...kenwald.de>
To:	linux-kernel@...r.kernel.org
Subject: WARNING at arch/x86/mm/ioremap.c:469 (early_ioremap_init), Xen domU

Hi,

not sure whether I'm actually supposed to report that one, feel free to
ignore if this warning is supposed to be there.

2.6.27-rc6 as a Xen pvops domU on i386, both with CONFIG_SMP set and
without (and patch from http://bugzilla.kernel.org/show_bug.cgi?id=11485
applied) report the following warning on startup.

Linux version 2.6.27-rc6-sendmsg-debug (bschmidt@...01.teleport-iabg.de)
(gcc version 4.3.1 (Debian 4.3.1-9) ) #4 SMP Thu Sep 11 17:41:20 CEST
2008
------------[ cut here ]------------
WARNING: at arch/x86/mm/ioremap.c:469 early_ioremap_init+0xfe/0x1a3()
Pid: 0, comm: swapper Not tainted 2.6.27-rc6sendmsg-debug #4
 [<c011e310>] warn_on_slowpath+0x3b/0x5e
 [<c0113491>] lookup_address+0xc0/0xe2
 [<c0103671>] xen_mc_flush+0x10a/0x13f
 [<c0104578>] xen_set_pmd_hyper+0x6b/0x75
 [<c02e9425>] early_ioremap_init+0xfe/0x1a3
 [<c02e4006>] early_cpu_init+0x17e/0x186
 [<c02e10c3>] setup_arch+0x2a/0x453
 [<c02df7cc>] start_kernel+0x5d/0x252
 [<c02e0788>] xen_start_kernel+0x7e9/0x7f1
 =======================
---[ end trace 4eaa2a86a8e2da22 ]---
pmd c031ad50 != c031ad58
fix_to_virt(FIX_BTMAP_BEGIN): f55fe000
fix_to_virt(FIX_BTMAP_END):   f56fd000
FIX_BTMAP_END:       256
FIX_BTMAP_BEGIN:     511
BIOS-provided physical RAM map:

can't remember seeing that on 2.6.26 so it's probably a regression, but
it doesn't seem to have any ill-effects. Full dmesg and config attached.

Regards,
Bernhard


View attachment "config-xen" of type "text/plain" (21163 bytes)

View attachment "dmesg-xen.txt" of type "text/plain" (5877 bytes)