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authorSteven Rostedt <srostedt@redhat.com>2011-04-21 22:41:35 -0400
committerSteven Rostedt <rostedt@goodmis.org>2011-04-29 22:52:55 -0400
commit8ab2b7efd3e2ccf2c2dda3206b8171ecdbd0af40 (patch)
tree69b3bbcdbbe7deecf3910ee28ee62e07c004a2ea /kernel/trace
parent0778d9ad33898faab7bf6316108b471790376e35 (diff)
downloadop-kernel-dev-8ab2b7efd3e2ccf2c2dda3206b8171ecdbd0af40.zip
op-kernel-dev-8ab2b7efd3e2ccf2c2dda3206b8171ecdbd0af40.tar.gz
ftrace: Remove unnecessary disabling of irqs
The disabling of interrupts around ftrace_update_code() was used to protect against the evil ftrace daemon from years past. But that daemon has long been killed. It is safe to keep interrupts enabled while updating the initial mcount into nops. The ftrace_mutex is also held which keeps other users at bay. Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace')
-rw-r--r--kernel/trace/ftrace.c4
1 files changed, 0 insertions, 4 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 4ff65599..f199fb2 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -2707,7 +2707,6 @@ static int ftrace_process_locs(struct module *mod,
{
unsigned long *p;
unsigned long addr;
- unsigned long flags;
mutex_lock(&ftrace_lock);
p = start;
@@ -2724,10 +2723,7 @@ 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;
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