Re: Problem with EXPORT_SYMBOL(irq_to_desc)

[Prabhu nath <gprabhunath@xxxxxxxxx>]

Thanks a lot. It was to do with CONFIG_SPARSE_IRQ. Just overshot my sight. 
I had exported a wrong irq_to_desc() which is under the belt of CONFIG_SPARSE_IRQ which was not configured. 
Its working now 

Regards,
Prabhu

On Wed, Aug 11, 2010 at 10:34 PM, Mulyadi Santosa <mulyadi.santosa@xxxxxxxxx> wrote:

I don't exactly know the problem...but here's something to think...

On Wed, Aug 11, 2010 at 13:07, Prabhu nath <gprabhunath@xxxxxxxxx> wrote:
> Hi,
>
>         I am facing a peculiar behaviour on Kernel version 2.6.34.1
> (http://lxr.linux.no/#linux+v2.6.34.1).
>
>        For my experimentation I just wanted to use the following two kernel
> functions in my Kernel module
>
>         1. find_task_by_vpid
> (http://lxr.linux.no/#linux+v2.6.34.1/kernel/pid.c#L388)
>         2. irq_to_desc
> (http://lxr.linux.no/#linux+v2.6.34.1/kernel/irq/handle.c#L138)
>
>            Since these two functions are not exported by the Kernel, I
> exported these functions, built the kernel and used in my kernel module.

Seeing around handle.c, precisely lines surrounding the related
function, I see this:
endif /* !CONFIG_SPARSE_IRQ */

uhum...seems related to sparse IRQ handling..so basic question here:
which one did you export? the one in CONFIG_SPARSE_IRQ=y? or the other
one?


--
regards,

Mulyadi Santosa
Freelance Linux trainer and consultant

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