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authorArjan van de Ven <arjan@linux.intel.com>2009-01-07 08:45:46 -0800
committerArjan van de Ven <arjan@linux.intel.com>2009-01-07 08:45:46 -0800
commit22a9d645677feefd402befd02edd59b122289ef1 (patch)
tree9f1215cc8f7f0e1c36b03882b2926cc26ccfa5ff /kernel/irq/autoprobe.c
parentede6f5aea054d3fb67c78857f7abdee602302043 (diff)
downloadlinux-2.6.34-ux500-22a9d645677feefd402befd02edd59b122289ef1.tar.gz
async: Asynchronous function calls to speed up kernel boot
Right now, most of the kernel boot is strictly synchronous, such that various hardware delays are done sequentially. In order to make the kernel boot faster, this patch introduces infrastructure to allow doing some of the initialization steps asynchronously, which will hide significant portions of the hardware delays in practice. In order to not change device order and other similar observables, this patch does NOT do full parallel initialization. Rather, it operates more in the way an out of order CPU does; the work may be done out of order and asynchronous, but the observable effects (instruction retiring for the CPU) are still done in the original sequence. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Diffstat (limited to 'kernel/irq/autoprobe.c')
-rw-r--r--kernel/irq/autoprobe.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/irq/autoprobe.c b/kernel/irq/autoprobe.c
index cc0f7321b8c..1de9700f416 100644
--- a/kernel/irq/autoprobe.c
+++ b/kernel/irq/autoprobe.c
@@ -10,6 +10,7 @@
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
+#include <linux/async.h>
#include "internals.h"
@@ -34,6 +35,10 @@ unsigned long probe_irq_on(void)
unsigned int status;
int i;
+ /*
+ * quiesce the kernel, or at least the asynchronous portion
+ */
+ async_synchronize_full();
mutex_lock(&probing_active);
/*
* something may have generated an irq long ago and we want to