From: Tejun Heo Date: Tue, 20 Jul 2010 13:59:09 +0000 (+0200) Subject: workqueue: fix mayday_mask handling on UP X-Git-Tag: v2.6.36-rc1~506^2~11 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f2e005aaff4878a8ea93d5fb033a21389b72579a;p=pandora-kernel.git workqueue: fix mayday_mask handling on UP All cpumasks are assumed to have cpu 0 permanently set on UP, so it can't be used to signify whether there's something to be done for the CPU. workqueue was using cpumask to track which CPU requested rescuer assistance and this led rescuer thread to think there always are pending mayday requests on UP, which resulted in infinite busy loops. This patch fixes the problem by introducing mayday_mask_t and associated helpers which wrap cpumask on SMP and emulates its behavior using bitops and unsigned long on UP. Signed-off-by: Tejun Heo Cc: Rusty Russell --- Reading git-diff-tree failed