linux-kernel - Re: [RESEND PATCH] MIPS: head: Reorder instructions missing a delay slot

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Message-ID: <20170627214018.GD10090@linux-mips.org>
Date:   Tue, 27 Jun 2017 23:40:18 +0200
From:   Ralf Baechle <ralf@...ux-mips.org>
To:     Karl Beldan <karl.beldan@...il.com>
Cc:     linux-mips@...ux-mips.org, linux-kernel@...r.kernel.org,
        Karl Beldan <karl.beldan+oss@...il.com>,
        stable@...r.kernel.org, Jonas Gorski <jogo@...nwrt.org>
Subject: Re: [RESEND PATCH] MIPS: head: Reorder instructions missing a delay
 slot

On Tue, Jun 27, 2017 at 07:22:16PM +0000, Karl Beldan wrote:

> In this sequence the 'move' is assumed in the delay slot of the 'beq',
> but head.S is in reorder mode and the former gets pushed one 'nop'
> farther by the assembler.
> 
> The corrected behavior made booting with an UHI supplied dtb erratic.

Excellent catch, patch applied!

Thanks Karl,

  Ralf