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authorVenki Pallipadi <venkatesh.pallipadi@intel.com>2008-04-10 09:49:58 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-10 15:38:29 -0700
commit783e391b7b5b273cd20856d8f6f4878da8ec31b3 (patch)
tree897e8db7c6eaf3763c2f1ef9aa099f2691d76400 /kernel
parenta1e58bbdc969c3fe60addca7f2729779d22a83c1 (diff)
x86: Simplify cpu_idle_wait
This patch also resolves hangs on boot: http://lkml.org/lkml/2008/2/23/263 http://bugzilla.kernel.org/show_bug.cgi?id=10093 The bug was causing once-in-few-reboots 10-15 sec wait during boot on certain laptops. Earlier commit 40d6a146629b98d8e322b6f9332b182c7cbff3df added smp_call_function in cpu_idle_wait() to kick cpus that are in tickless idle. Looking at cpu_idle_wait code at that time, code seemed to be over-engineered for a case which is rarely used (while changing idle handler). Below is a simplified version of cpu_idle_wait, which just makes a dummy smp_call_function to all cpus, to make them come out of old idle handler and start using the new idle handler. It eliminates code in the idle loop to handle cpu_idle_wait. Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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