linux-kernel - [init_netsc520] WARNING: CPU: 0 PID: 1 at arch/x86/mm/ioremap.c:102 __ioremap

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Date:	Wed, 9 Oct 2013 15:25:45 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	linux-mtd@...ts.infradead.org
Cc:	fengguang.wu@...el.com, LKML <linux-kernel@...r.kernel.org>
Subject: [init_netsc520] WARNING: CPU: 0 PID: 1 at arch/x86/mm/ioremap.c:102
 __ioremap_caller()

Greetings,

FYI, here is an old warning tat dates back at least to linux v3.0:

[    1.216507] NetSc520 flash device: 0x100000 at 0x200000
[    1.218335] ------------[ cut here ]------------
[    1.219996] WARNING: CPU: 0 PID: 1 at arch/x86/mm/ioremap.c:102 __ioremap_caller+0x13f/0x3f0()
[    1.223587] CPU: 0 PID: 1 Comm: swapper Not tainted 3.12.0-rc4-01587-g97d3ab9 #357
[    1.226402] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    1.228361]  00000000 00000000 cecd9e34 c0e00466 cecd9e64 c023c755 c1215818 00000000
[    1.232404]  00000001 c12147a0 00000066 c022f29f c022f29f 00000200 00000001 00000001
[    1.236439]  cecd9e74 c023c842 00000009 00000000 cecd9ec8 c022f29f 00000060 00000246
[    1.240473] Call Trace:
[    1.241633]  [<c0e00466>] dump_stack+0x16/0x18
[    1.243255]  [<c023c755>] warn_slowpath_common+0x75/0x90
[    1.245096]  [<c022f29f>] ? __ioremap_caller+0x13f/0x3f0
[    1.246915]  [<c022f29f>] ? __ioremap_caller+0x13f/0x3f0
[    1.248771]  [<c023c842>] warn_slowpath_null+0x22/0x30
[    1.250552]  [<c022f29f>] __ioremap_caller+0x13f/0x3f0
[    1.252361]  [<c0de99db>] ? printk+0x3d/0x3f
[    1.253936]  [<c15af4cd>] ? init_sc520cdp+0x216/0x216
[    1.255730]  [<c022f599>] ioremap_nocache+0x19/0x20
[    1.257456]  [<c15af511>] ? init_netsc520+0x44/0xf6
[    1.259217]  [<c15af511>] init_netsc520+0x44/0xf6
[    1.260891]  [<c156abc6>] do_one_initcall+0x108/0x1ce
[    1.262689]  [<c0713822>] ? strlen+0x12/0x20
[    1.264270]  [<c156a500>] ? repair_env_string+0x3/0x51
[    1.266085]  [<c0258646>] ? parse_args+0x296/0x4b0
[    1.267785]  [<c156adb4>] kernel_init_freeable+0x128/0x1ba
[    1.269653]  [<c156a4fd>] ? do_early_param+0x78/0x78
[    1.271413]  [<c0de4310>] kernel_init+0x10/0x140
[    1.273077]  [<c0e0c0db>] ret_from_kernel_thread+0x1b/0x30
[    1.274948]  [<c0de4300>] ? rest_init+0x70/0x70
[    1.276596] ---[ end trace e29a2c8115f76b14 ]---
[    1.279410] Creating 4 MTD partitions on "netsc520 Flash Bank":

git bisect  bad 97d3ab9b2207d72eb0f72347969c284562c374bd  # 21:47      0-     32  Merge branch 'perf/urgent'
git bisect  bad d0e639c9e06d44e713170031fe05fb60ebe680af  # 21:48      0-     80  Linux 3.12-rc4
git bisect  bad 6e4664525b1db28f8c4e1130957f70a94c19213e  # 21:53      0-      2  Linux 3.11
git bisect  bad 8bb495e3f02401ee6f76d1b1d77f3ac9f079e376  # 21:58      0-     11  Linux 3.10
git bisect  bad c1be5a5b1b355d40e6cf79cc979eb66dafa24ad1  # 22:03      0-      9  Linux 3.9
git bisect  bad 19f949f52599ba7c3f67a5897ac6be14bfcb1200  # 22:08      0-      1  Linux 3.8
git bisect  bad 29594404d7fe73cd80eaa4ee8c43dcc53970c60e  # 22:13      0-     10  Linux 3.7
git bisect  bad a0d271cbfed1dd50278c6b06bead3d00ba0a88f9  # 22:19      0-     12  Linux 3.6
git bisect  bad 28a33cbc24e4256c143dce96c7d93bf423229f92  # 22:23      0-      2  Linux 3.5
git bisect  bad 76e10d158efb6d4516018846f60c2ab5501900bc  # 22:28      0-     11  Linux 3.4
git bisect  bad c16fa4f2ad19908a47c63d8fa436a1178438c7e7  # 22:32      0-      3  Linux 3.3
git bisect  bad 805a6af8dba5dfdd35ec35dc52ec0122400b2610  # 22:37      0-      8  Linux 3.2
git bisect  bad c3b92c8787367a8bb53d57d9789b558f1295cc96  # 22:41      0-     13  Linux 3.1
git bisect  bad 02f8c6aee8df3cdc935e9bdd4f2d020306035dbe  # 22:45      0-     15  Linux 3.0
git bisect  bad 8b5ede69d24db939f52b47effff2f6fe1e83e08b  # 23:56      0-     32  powerpc/irq: Don't switch to irq stack from softirq stack
git bisect  bad a0cf1abc25ac197dd97b857c0f6341066a8cb1cf  # 23:56      0-     23  Add linux-next specific files for 20130927
git bisect  bad 97d3ab9b2207d72eb0f72347969c284562c374bd  # 23:56      0-     39  Merge branch 'perf/urgent'

Thanks,
Fengguang

View attachment "dmesg-yocto-lkp-tt02-20:20131008092925:i386-randconfig-i009-1008:3.12.0-rc4-01587-g97d3ab9:357" of type "text/plain" (37904 bytes)

Download attachment "bisect-97d3ab9b2207d72eb0f72347969c284562c374bd-i386-randconfig-i009-1008-arch-x---mm-ioremap-c-7748.log" of type "application/octet-stream" (91991 bytes)

View attachment "config-3.12.0-rc4-01587-g97d3ab9" of type "text/plain" (89810 bytes)