linux-kernel - Re: Why can't we sleep in an ISR?

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Message-ID: <a2ebde260705142345m440c70fbu33934334fbb69f8e@mail.gmail.com>
Date:	Tue, 15 May 2007 14:45:43 +0800
From:	"Dong Feng" <middle.fengdong@...il.com>
To:	"pradeep singh" <2500.pradeep@...il.com>
Cc:	"Bahadir Balban" <bahadir.balban@...il.com>,
	"Learning Linux" <learninglinux4@...il.com>,
	kernelnewbies@...linux.org, linux-newbie@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: Why can't we sleep in an ISR?

>
> good enough, but i have a query regarding this then.
> On a 8K kernel stack system, doesn't interrupts share the stack associated
> with the current process which was interrupted?

Yes, I think so.

> Doesn't interrupt steals the CPU slice time allocated to the running process
> to run?

I don't think so but I am not sure.

> Doesn't it run in current process's context ?
>

No. I think the concept of process context is a higher-level logical
concept. Though the interrupt share stack with the interrupted
process, in my opinion it logically does not share the context with
the process.

> What am i missing here?
>
> Thanks
> ~psr
>

But I do not see the exact relationship between your specific queries
and the original question. Could you elaborate?
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