openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

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>
This commit is contained in:
Steven Rostedt 2011-04-21 22:41:35 -04:00 committed by Steven Rostedt
parent 0778d9ad33
commit 8ab2b7efd3
1 changed files with 0 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
kernel/trace/ftrace.c
View File

@ -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;