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Re: [PATCH] vr41xx: fix problem with vr41xx_cpu_wait

Subject: Re: [PATCH] vr41xx: fix problem with vr41xx_cpu_wait
From: Atsushi Nemoto <>
Date: Thu, 07 Aug 2008 02:10:57 +0900 (JST)
In-reply-to: <>
Original-recipient: rfc822;
References: <> <> <>
On Wed, 6 Aug 2008 16:17:10 +0000, Ricardo Mendoza <> wrote:
> I see, I hadn't read that thread before. Yoichi's rev of the patch
> should go in but we should put some effort in finding a better route for
> CPUs that are not forcefully aware by hardware of interrupts in their
> wait call.
> Was some work ever done on Ralf's idea in the "WAIT vs. tickless kernel"
> ML thread? Regarding patching the return from exception code to contain
> a check for this particular loop.

Yes.  My last proposal is:

To support vr41's standby instruction in same way, we might have to
synthesise rollback_handle_int, etc. or r4k_wait at runtime...

Atsushi Nemoto

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