linux-kernel - Re: /ioremap.c:191 __ioremap_caller... Info: mapping multiple BARs. Your kernel is fine.

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Date:	Wed, 4 Nov 2015 14:43:19 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Toralf Förster <toralf.foerster@....de>
cc:	X86 ML <x86@...nel.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: /ioremap.c:191 __ioremap_caller... Info: mapping multiple BARs.
 Your kernel is fine.

On Mon, 2 Nov 2015, Toralf Förster wrote:

> Starting with 4.1 and still in 4.3-rc7 I get this in dmesg during
> boot phase at a 64 bit Gentoo Linux at a Lenovo T440s:

> ------------[ cut here ]------------
> WARNING: CPU: 1 PID: 1 at arch/x86/mm/ioremap.c:191 __ioremap_caller+0x233/0x380()
> Info: mapping multiple BARs. Your kernel is fine.
...
>  [<ffffffff8104e633>] __ioremap_caller+0x233/0x380
>  [<ffffffff8102b51d>] ? snb_uncore_imc_init_box+0x6d/0xa0
>  [<ffffffff8104e7a6>] ioremap_nocache+0x26/0x40
>  [<ffffffff8102b51d>] snb_uncore_imc_init_box+0x6d/0xa0
>
> Should I worry about that ?

I don't think so. It's probably some BIOS/ACPI wreckage, but Peter
might have more insight than me.

Thanks,

	tglx