linux-kernel - Re: Strange arch/mips/delay.c

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Date:	Sun, 2 Aug 2009 00:33:05 +0100
From:	Ralf Baechle <ralf@...ux-mips.org>
To:	Loïc Grenié <loic.grenie@...il.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Strange arch/mips/delay.c

On Sat, Aug 01, 2009 at 07:37:18PM +0200, Loïc Grenié wrote:

>   I could not compile for mips without something similar to the
> following patch. As far as I can say __udelay and __ndelay
> are costly nops (with __ndelay not compiling at all) without
> the patch.
> 
>   At that point, it might be interesting to change
> the 0x00000005uLL by 0x00000045uLL and the >> 32
> by >> 36 (the precision is much better and the cost
> should be the same -- obviously there is a slightly higher
> risk of overlow).

Later versions of the kernel already contain a similar fix.  I've not
propagated MIPS fixes into upstream -stable but the fixes are available
in the -stable branches of the MIPS git repository at
git://git.linux-mips.org/pub/scm/linux.git, the tarballs created from
that repository available for download on {ftp,www}.linux-mips.org  or
on git.kernel.org.

  Ralf
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