linux-kernel - Re: [PATCH v5 29/29] nios2: Build infrastructure

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Message-ID: <11875981.eJaWCbGJJT@wuerfel>
Date:	Thu, 30 Oct 2014 12:33:38 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Ley Foon Tan <lftan@...era.com>
Cc:	Linux-Arch <linux-arch@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	Chung-Lin Tang <cltang@...esourcery.com>
Subject: Re: [PATCH v5 29/29] nios2: Build infrastructure

On Thursday 30 October 2014 18:44:37 Ley Foon Tan wrote:
> >
> > I don't remember what all of these are, but at least some of them seem
> > to be concerned with 64-bit division. By convention, we don't provide those
> > in the Linux kernel but instead require all code to use the do_div()
> > macro instead.
> Do you mean kernel doesn't support 64 bit division result for a 32-bit
> architecture? Because do_div() only support 32-bit division result for
> 32-bit architecture.

Correct. If you need a full 64-bit division on a 32-bit kernel, the
assumption is that your driver has a bug.

	Arnd
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