From: Ralf Baechle <ralf@linux-mips.org>
To: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Cc: linux-mips@linux-mips.org
Subject: Re: [PATCH] fix mdelay(1) for 64bit kernel with HZ == 1000
Date: Mon, 5 Dec 2005 14:35:30 +0000 [thread overview]
Message-ID: <20051205143530.GD2728@linux-mips.org> (raw)
In-Reply-To: <20051130.133326.126937941.nemoto@toshiba-tops.co.jp>
On Wed, Nov 30, 2005 at 01:33:26PM +0900, Atsushi Nemoto wrote:
> mdelay(1) (i.e. udelay(1000)) does not work correctly due to overflow.
>
> 1000 * 0x004189374BC6A7f0 = 0x10000000000000180 (>= 2**64)
>
> 0x004189374BC6A7ef (0x004189374BC6A7f0 - 1) is OK and it is exactly
> same as catchall case (0x8000000000000000UL / (500000 / HZ)).
>
> Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Applied.
prev parent reply other threads:[~2005-12-05 14:36 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-11-30 4:33 [PATCH] fix mdelay(1) for 64bit kernel with HZ == 1000 Atsushi Nemoto
2005-12-05 14:35 ` Ralf Baechle [this message]
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