Re: [PATCH][MIPS] bcm47xx: remove unneeded clear_c0_status()

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To: Yoichi Yuasa <yoichi_yuasa@xxxxxxxxxxxxxx>
Subject: Re: [PATCH][MIPS] bcm47xx: remove unneeded clear_c0_status()
From: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Date: Thu, 1 Nov 2007 13:03:52 +0000
Cc: linux-mips <linux-mips@xxxxxxxxxxxxxx>
In-reply-to: <20071101213036.c383957f.yoichi_yuasa@xxxxxxxxxxxxxx>
User-agent: Mutt/1.5.14 (2007-02-12)

On Thu, Nov 01, 2007 at 09:30:36PM +0900, Yoichi Yuasa wrote:

> Remove unneeded clear_c0_status().
> irq_cpu routines take care of it.

Actually this write is plain nonsense; it has no effect.  The only time
acknowledging an interrupt in c0_cause is needed is for the two software
interrupts but the only user of these is SMTC.

  Ralf

References:
- [PATCH][MIPS] bcm47xx: remove unneeded clear_c0_status()
  - From: Yoichi Yuasa

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