From: NeilBrown <neilb@suse.de>
Date: Tue, 31 Mar 2009 03:27:02 +0000 (+1100)
Subject: md: Fix is_mddev_idle test (again).
X-Git-Tag: v2.6.30-rc1~241^2~52
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=eea1bf384e05b5ab747f8530c4fba9e9e6907fff;p=pandora-kernel.git

md: Fix is_mddev_idle test (again).

There are two problems with is_mddev_idle.

1/ sync_io is 'atomic_t' and hence 'int'.  curr_events and all the
   rest are 'long'.
   So if sync_io were to wrap on a 64bit host, the value of
   curr_events would go very negative suddenly, and take a very
   long time to return to positive.

   So do all calculations as 'int'.  That gives us plenty of precision
   for what we need.

2/ To initialise rdev->last_events we simply call is_mddev_idle, on
   the assumption that it will make sure that last_events is in a
   suitable range.  It used to do this, but now it does not.
   So now we need to be more explicit about initialisation.

Signed-off-by: NeilBrown <neilb@suse.de>
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