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| author | Steven Rostedt <srostedt@redhat.com> | 2008-05-12 21:20:43 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2008-05-23 20:33:19 +0200 |
| commit | b0fc494fae96a7089f3651cb451f461c7291244c (patch) | |
| tree | 586412b9ecbd8e3f04e8cd90a31644f94ff3a7d8 /kernel/sysctl.c | |
| parent | 3d0833953e1b98b79ddf491dd49229eef9baeac1 (diff) | |
| download | lwn-b0fc494fae96a7089f3651cb451f461c7291244c.tar.gz lwn-b0fc494fae96a7089f3651cb451f461c7291244c.zip | |
ftrace: add ftrace_enabled sysctl to disable mcount function
This patch adds back the sysctl ftrace_enabled. This time it is
defaulted to on, if DYNAMIC_FTRACE is configured. When ftrace_enabled
is disabled, the ftrace function is set to the stub return.
If DYNAMIC_FTRACE is also configured, on ftrace_enabled = 0,
the registered ftrace functions will all be set to jmps, but no more
new calls to ftrace recording (used to find the ftrace calling sites)
will be called.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/sysctl.c')
| -rw-r--r-- | kernel/sysctl.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 29116652dca8..efaf7c5500e9 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -46,6 +46,7 @@ #include <linux/nfs_fs.h> #include <linux/acpi.h> #include <linux/reboot.h> +#include <linux/ftrace.h> #include <asm/uaccess.h> #include <asm/processor.h> @@ -455,6 +456,16 @@ static struct ctl_table kern_table[] = { .mode = 0644, .proc_handler = &proc_dointvec, }, +#ifdef CONFIG_FTRACE + { + .ctl_name = CTL_UNNUMBERED, + .procname = "ftrace_enabled", + .data = &ftrace_enabled, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &ftrace_enable_sysctl, + }, +#endif #ifdef CONFIG_KMOD { .ctl_name = KERN_MODPROBE, |