linux-kernel - Re: [PATCH v1 1/2] ARM:prima2: move sirfsoc_of_rstc_init to .init

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Date:	Mon, 03 Jun 2013 09:47:35 +0100
From:	Srinivas KANDAGATLA <srinivas.kandagatla@...com>
To:	Barry Song <21cnbao@...il.com>
Cc:	Russell King <linux@....linux.org.uk>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Barry Song <baohua.song@....com>
Subject: Re: [PATCH v1 1/2] ARM:prima2: move sirfsoc_of_rstc_init to .init_early

Hi Barry,
Thanks for testing,
I think this patch introduced a sequencing issue.

Just re-looking at the code, is there any reason for this to be
init_earlycall? And do a ioremap at that early stage?

Can't we move it to device_init level function "sirfsoc_mach_init()" at
which it will be safe to do a ioremap with all mm setup finished?


Thanks,
srini

On 03/06/13 03:19, Barry Song wrote:
> this broke SiRF by:
> Uncompressing Linux... done, booting the kernel.
> [    0.000000] Booting Linux on physical CPU 0x0
> [    0.000000] Linux version 3.10.0-rc2-00723-gd1a0472-dirty
> (barry@...ry-laptop) (gcc version 4.5.4 20110505 (prerelease)
> (Ubuntu/Linaro 4.5-2011.5-csr-build) ) #35 SMP PREEMPT Mon Jun 3
> 09:51:59 CST 2013
> [    0.000000] CPU: ARMv7 Processor [413fc090] revision 0 (ARMv7), cr=10c53c7d
> [    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing
> instruction cache
> [    0.000000] Machine: Generic ATLAS6 (Flattened Device Tree), model:
> CSR SiRFatlas6 Evaluation Board
> [    0.000000] bootconsole [earlycon0] enabled
> [    0.000000] Memory policy: ECC disabled, Data cache writealloc
> [    0.000000] Unable to handle kernel NULL pointer dereference at
> virtual address 00000000
> [    0.000000] pgd = c0004000
> [    0.000000] [00000000] *pgd=00000000
> [    0.000000] Internal error: Oops: 5 [#1] PREEMPT SMP ARM
> [    0.000000] Modules linked in:
> [    0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted
> 3.10.0-rc2-00723-gd1a0472-dirty #35
> [    0.000000] task: c05cfb40 ti: c05c4000 task.ti: c05c4000
> [    0.000000] PC is at kmem_cache_alloc+0x2c/0x124
> [    0.000000] LR is at __get_vm_area_node.clone.26+0x7c/0x190

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