On Fri, Aug 24, 2018 at 03:12:20PM +0200, Vincent Whitchurch wrote: > If kmemleak built in to the kernel, but is disabled by default, the > debugfs file is never registered. Because of this, it is not possible > to find out if the kernel is built with kmemleak support by checking for > the presence of this file. To allow this, always register the file. > > After this patch, if the file doesn't exist, kmemleak is not available > in the kernel. If writing "scan" or any other value than "clear" to > this file results in EBUSY, then kmemleak is available but is disabled > by default and can be activated via the kernel command line. > > Signed-off-by: Vincent Whitchurch <vincent.whitchurch@xxxxxxxx> I think that's also consistent with a late disabling of kmemleak when the debugfs entry sticks around. Acked-by: Catalin Marinas <catalin.marinas@xxxxxxx>
