linux-kernel - [init_sc520cdp] WARNING: CPU: 1 PID: 1 at arch/x86/mm/ioremap.c:102 __ioremap

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Date:	Mon, 23 Dec 2013 11:14:05 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>
Cc:	David Woodhouse <dwmw2@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [init_sc520cdp] WARNING: CPU: 1 PID: 1 at arch/x86/mm/ioremap.c:102
 __ioremap_caller+0x28f/0x668()


Greetings,

The below warning shows up in linux-next and was fine in v3.13-rc4:

[    2.305687] Trying default address 0x9400000
[    2.306177] SC520 CDP flash device: 0x800000 at 0x8400000
[    2.306784] ------------[ cut here ]------------
[    2.307297] WARNING: CPU: 1 PID: 1 at arch/x86/mm/ioremap.c:102 __ioremap_caller+0x28f/0x668()
[    2.308492] Modules linked in:
[    2.308862] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 3.13.0-rc4-next-20131220-06014-gf15b2a3 #1
[    2.309835] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.310466]  0000000000000006 ffff88000ecdfd90 ffffffff8867b58b 0000000000000000
[    2.311341]  ffff88000ecdfdc8 ffffffff87c7df1b ffffffff87c42291 0000000008400000
[    2.312221]  0000000000000010 0000000000008400 0000000000000001 ffff88000ecdfdd8
[    2.313112] Call Trace:
[    2.313394]  [<ffffffff8867b58b>] dump_stack+0xa1/0xd6
[    2.313965]  [<ffffffff87c7df1b>] warn_slowpath_common+0xb0/0xde
[    2.314619]  [<ffffffff87c42291>] ? __ioremap_caller+0x28f/0x668
[    2.315273]  [<ffffffff87c7df71>] warn_slowpath_null+0x28/0x31
[    2.315927]  [<ffffffff87c42291>] __ioremap_caller+0x28f/0x668
[    2.316584]  [<ffffffff897d19da>] ? init_sc520cdp+0x17d/0x389
[    2.317213]  [<ffffffff87c426e6>] ioremap_nocache+0x25/0x2e
[    2.317830]  [<ffffffff897d19da>] init_sc520cdp+0x17d/0x389
[    2.318437]  [<ffffffff897d185d>] ? init_l440gx+0x469/0x469
[    2.319053]  [<ffffffff87c00355>] do_one_initcall+0xcf/0x1f3
[    2.319710]  [<ffffffff87caa585>] ? parameq+0x29/0x32
[    2.320268]  [<ffffffff87caa802>] ? parse_args+0x274/0x3af
[    2.320886]  [<ffffffff8978060d>] kernel_init_freeable+0x1ea/0x2ea
[    2.321557]  [<ffffffff8977f970>] ? do_early_param+0xd7/0xd7
[    2.322202]  [<ffffffff88654733>] ? rest_init+0x167/0x167
[    2.322828]  [<ffffffff88654748>] kernel_init+0x15/0x186
[    2.323413]  [<ffffffff8869f14c>] ret_from_fork+0x7c/0xb0
[    2.324018]  [<ffffffff88654733>] ? rest_init+0x167/0x167
[    2.324621] ---[ end trace 79acbb3d3c741c0f ]---
[    2.341477] kworker/u4:1 (78) used greatest stack depth: 6288 bytes left

Attached is the full dmesg and kconfig that can trigger this warning.

Thanks,
Fengguang

View attachment "dmesg-yocto-roam-14:20131223102711:x86_64-randconfig-a3-12231009:3.13.0-rc4-next-20131220-06014-gf15b2a3:1" of type "text/plain" (47260 bytes)

View attachment "config-3.13.0-rc4-next-20131220-06014-gf15b2a3" of type "text/plain" (92782 bytes)