PATCH[2.6.32] softirq patch

[Sadasivan Shaiju <sshaiju@mvista.com>]

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Hi ,

I  work for Montavista (Cavium Inc) as  a  Technical  Lead .  I want to
push some  of the kernel  patches to  rt community (2.6.32 kernel 2.6.33
rt patch)  , so  that  It  will  go  to  the  main line
These patches  are reviewed  and approved  by  our system Architect.  I
request  you to  include  in the main line .  These  issues  were
reported  by our customer CISCO.

Problem Description:
>From time to time, the following warning appears in the kernel logs on
x86, OCTEON Plus and Octeon II:

NOHZ: local_softirq_pending 08

Root Cause:
In run_ksoftirqd, _local_bh_enable() is used to enable bottom half.
This does not kick off softirq processing.

How Solved:
In run_ksoftirqd, _local_bh_enable() has been replaced with
local_bh_enable() to
enable softirq processing .

Here  I  am attaching  the  patch  for  the  above  bug .   If  any
questions  please  contact  me  at    sshaiju@mvista.com
(shaiju_sada@yahoo.com)

Regards,
Shaiju.

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From 2fa7121b912754f8149774d6a012becf542ffa18 Mon Sep 17 00:00:00 2001
From: Sadasivan Shaiju <sshaiju@mvista.com>
Date: Mon, 6 Feb 2012 18:54:53 -0800
Subject: [PATCH] softirq: Call do_softirq() from run_ksoftirqd() when needed

Source: MontaVista Software, LLC
MR: 47371
Type: Defect Fix
Disposition: Local
ChangeID: 3066b1f971e16b3fc22e6c4e4bba9c6786811acc
Description:

In run_ksoftirqd _local_bh_enable() has to be replaced with
local_bh_enable() to enable softirq processing.

The call to _local_bh_enable() was introduced in the merge of
RT patch-2.6.33-rt7.

Signed-off-by: Sadasivan Shaiju <sshaiju@mvista.com>
Signed-off-by: Dale Farnsworth <dfarnsworth@mvista.com>
---
 kernel/softirq.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/softirq.c b/kernel/softirq.c
index 67116c8..cdf52d2 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -1080,7 +1080,7 @@ sleep_more:
 
 			local_irq_disable();
 			per_cpu(softirq_running, cpu) &= ~softirq_mask;
-			_local_bh_enable();
+			local_bh_enable();
 			local_irq_enable();
 
 			cond_resched();
-- 
1.7.0.1