Messages in this thread Patch in this message | | | From | Waiman Long <> | Subject | [PATCH-cgroup 5/5] cgroup: Enable debug controller only with cgroup_debug boot option | Date | Tue, 13 Jun 2017 17:18:05 -0400 |
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As suggested by Tejun, the debug controller will be activated only when the "cgroup_debug" option is specified in the kernel boot command line. Hopefully, that will discourage people from using the debug controller for any purpose other than cgroup core debugging.
Signed-off-by: Waiman Long <longman@redhat.com> --- kernel/cgroup/debug.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+)
diff --git a/kernel/cgroup/debug.c b/kernel/cgroup/debug.c index 82e5cbd..be901c0 100644 --- a/kernel/cgroup/debug.c +++ b/kernel/cgroup/debug.c @@ -320,3 +320,23 @@ struct cgroup_subsys debug_cgrp_subsys = { .dfl_cftypes = debug_files, .threaded = true, }; + +/* + * Disable the debug controller by hiding the debug cgroup control files + * if the kernel boot parameter "cgroup_debug" isn't set. + */ +static bool cgroup_debug_enable __initdata; +static int __init enable_cgroup_debug(char *str) +{ + cgroup_debug_enable = true; + return 1; +} +__setup("cgroup_debug", enable_cgroup_debug); + +static int __init debug_init(void) +{ + if (!cgroup_debug_enable) + debug_files[0].name[0] = '\0'; + return 0; +} +core_initcall(debug_init); -- 1.8.3.1
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