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SubjectKconfig.preempt advertises no longer existing hardirq-preempt option and related proc entries.
From
Seems like the documentation for PREEMPT_HARDIRQS has fallen behind
the code. I would like to submit the following patch to fix that
situation. Anybody happen to know why the option and proc entry were
removed? I would have loved to have used them...

Signed-off-by: Blaise Gassend <blaise@willowgarage.com>

diff -ru linux-2.6.33.7-rt29/kernel/Kconfig.preempt
linux-2.6.33.7-rt29-modified/kernel/Kconfig.preempt
--- linux-2.6.33.7-rt29/kernel/Kconfig.preempt  2010-10-12
09:59:18.335119093 -0700
+++ linux-2.6.33.7-rt29-modified/kernel/Kconfig.preempt 2010-10-12
10:01:17.185554319 -0700
@@ -113,10 +113,4 @@
          in their own kernel thread context. While this helps latency,
          this feature can also reduce performance.

-          The threading of hardirqs can also be controlled via the
-          /proc/sys/kernel/hardirq_preemption runtime flag and the
-          hardirq-preempt=0/1 boot-time option. Per-irq threading can
-          be enabled/disable via the /proc/irq/<IRQ>/<handler>/threaded
-          runtime flags.
-
         Say N if you are unsure.
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