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Date: Wed, 28 Jul 2010 11:16:03 +0800
From: =?utf-8?Q?Am=C3=A9rico?= Wang <xiyou.wangcong@gmail.com>
To: Israel Schlesinger <israels@codeaurora.org>
Cc: linux-kernel@vger.kernel.org, apw@canonical.com, akpm@linux-foundation.org,
        joe@perches.com
Subject: Re: [PATCH v2] checkpatch: Add warnings for use of mdelay()
Message-ID: <20100728031603.GB5161@cr0.nay.redhat.com>
References: <4C4F16EE.9010008@codeaurora.org>
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On Tue, Jul 27, 2010 at 10:27:10AM -0700, Israel Schlesinger wrote:
>mdelay is a busy-wait loop which is wasteful. If at all possible,
>callers should use msleep instead of mdelay.
>
>The only time mdelay is really appropriate is in atomic context,
>however, delays of 1ms+ in atomic context are rather expensive, so
>a warning for this case is probably appropriate as well to encourage
>people to move such expensive delays outside of atomic context
>

Then udelay() is also preferred...
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