On Sun, Sep 29, 2019 at 11:18:49PM +0900, Akinobu Mita wrote: > Reading /sys/class/leds/<led>/trigger returns all available LED triggers. > However, the size of this file is limited to PAGE_SIZE because of the > limitation for sysfs attribute. > > Enabling LED CPU trigger on systems with thousands of CPUs easily hits > PAGE_SIZE limit, and makes it impossible to see all available LED triggers > and which trigger is currently activated. > > We work around it here by converting /sys/class/leds/<led>/trigger to > binary attribute, which is not limited by length. This is _not_ good > design, do not copy it. > > Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> > Cc: "Rafael J. Wysocki" <rafael@xxxxxxxxxx> > Cc: Jacek Anaszewski <jacek.anaszewski@xxxxxxxxx> > Cc: Pavel Machek <pavel@xxxxxx> > Cc: Dan Murphy <dmurphy@xxxxxx> > Signed-off-by: Akinobu Mita <akinobu.mita@xxxxxxxxx> Reviewed-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
