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List:       linux-embedded
Subject:    override an interrupt handler?
From:       "Wang, Baojun" <wangbj () dslab ! lzu ! edu ! cn>
Date:       2008-06-13 4:03:50
Message-ID: 1213329830.17351.13.camel () localhost ! dslab
[Download RAW message or body]

hi, 

  In my application I want to override the timer interrupt, and I'm
doing in this manner:

	disable_irq(0);		/* disable timer irq first */
	free_irq(0, NULL);	/* free the old irq */
	setup_irq(0, new_irq0);

setup_irq() return with 0, however I got the following OOPs message:

Bad page state in process 'swapper'
page:81003e20 flags:0x00000400 mapping:00000000 mapcount:0 count:0
Trying to fix it up, but a reboot is needed
Backtrace:
Call Trace:
[<8001819c>] dump_stack+0x8/0x34
[<8005ddc8>] bad_page+0x6c/0xa4
[<8005e600>] free_hot_cold_page+0x98/0x1e8
[<802074a8>] xm_init_clockevents+0x90/0xbc
[<80215998>] xm_init+0x208/0x240
[<80206680>] kernel_init+0xec/0x310
[<800149e0>] kernel_thread_helper+0x10/0x18


So, is it possible to override the timer interrupt handler? Any hints is
greatly appreciated.

  Regards,

-- 
Wang, Baojun                                                Lanzhou University
Distributed & Embedded System Lab                      http://dslab.lzu.edu.cn
School of Information Science and Engeneering          wangbj@dslab.lzu.edu.cn
Tianshui South Road 222. Lanzhou 730000                             .P.R.China
Tel: +86-931-8912025                                      Fax: +86-931-8912022


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