rhbz#710921: revert-ftrace-remove-unnecessary-disabling-of-irqs.patch

1 files changed, 36 insertions, 0 deletions

diff --git a/revert-ftrace-remove-unnecessary-disabling-of-irqs.patch b/revert-ftrace-remove-unnecessary-disabling-of-irqs.patch
new file mode 100644
index 000000000..31e8c34c4
--- /dev/null
+++ b/revert-ftrace-remove-unnecessary-disabling-of-irqs.patch
@@ -0,0 +1,36 @@
+From 2735da6316af256e62d5f6c15ffa451182734bc3 Mon Sep 17 00:00:00 2001
+From: Kyle McMartin <kyle@mcmartin.ca>
+Date: Thu, 9 Jun 2011 10:19:15 -0400
+Subject: Revert "ftrace: Remove unnecessary disabling of irqs"
+
+This reverts commit 8ab2b7efd3e2ccf2c2dda3206b8171ecdbd0af40.
+---
+ kernel/trace/ftrace.c |    4 ++++
+ 1 files changed, 4 insertions(+), 0 deletions(-)
+
+diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
+index 1ee417f..a75432a 100644
+--- a/kernel/trace/ftrace.c
++++ b/kernel/trace/ftrace.c
+@@ -3330,6 +3330,7 @@ static int ftrace_process_locs(struct module *mod,
+ {
+ 	unsigned long *p;
+ 	unsigned long addr;
++	unsigned long flags;
+ 
+ 	mutex_lock(&ftrace_lock);
+ 	p = start;
+@@ -3346,7 +3347,10 @@ static int ftrace_process_locs(struct module *mod,
+ 		ftrace_record_ip(addr);
+ 	}
+ 
++	/* disable interrupts to prevent kstop machine */
++	local_irq_save(flags);
+ 	ftrace_update_code(mod);
++	local_irq_restore(flags);
+ 	mutex_unlock(&ftrace_lock);
+ 
+ 	return 0;
+-- 
+1.7.5.2
+