aboutsummaryrefslogtreecommitdiffstats
path: root/lib/Kconfig.debug
diff options
context:
space:
mode:
authorSteven Rostedt <srostedt@redhat.com>2008-12-02 23:50:02 -0500
committerIngo Molnar <mingo@elte.hu>2008-12-03 02:56:23 -0500
commit14a866c567e040ccf6240d68b083dd1dbbde63e6 (patch)
tree4e8d62ecc345d44e7cd45f973ffb931070637532 /lib/Kconfig.debug
parentbb4304c71c97bf727ec43cd2f195c2c237c27fd3 (diff)
ftrace: add ftrace_graph_stop()
Impact: new ftrace_graph_stop function While developing more features of function graph, I hit a bug that caused the WARN_ON to trigger in the prepare_ftrace_return function. Well, it was hard for me to find out that was happening because the bug would not print, it would just cause a hard lockup or reboot. The reason is that it is not safe to call printk from this function. Looking further, I also found that it calls unregister_ftrace_graph, which grabs a mutex and calls kstop machine. This would definitely lock the box up if it were to trigger. This patch adds a fast and safe ftrace_graph_stop() which will stop the function tracer. Then it is safe to call the WARN ON. Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'lib/Kconfig.debug')
0 files changed, 0 insertions, 0 deletions