Commit-ID: 8ab2b7efd3e2ccf2c2dda3206b8171ecdbd0af40
Gitweb: http://git.kernel.org/tip/8ab2b7efd3e2ccf2c2dda3206b8171ecdbd0af40
Author: Steven Rostedt <srostedt@xxxxxxxxxx>
AuthorDate: Thu, 21 Apr 2011 22:41:35 -0400
Committer: Steven Rostedt <rostedt@xxxxxxxxxxx>
CommitDate: Fri, 29 Apr 2011 22:52:55 -0400
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@xxxxxxxxxxx>
---
kernel/trace/ftrace.c | 4 ----
1 files changed, 0 insertions(+), 4 deletions(-)
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 4ff6559..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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