Hi, On Thu, 18 Jul 2024, zhangyongde.zyd wrote: > From: Wardenjohn <zhangwarden@xxxxxxxxx> > > One system may contains more than one livepatch module. We can see > which patch is enabled. If some patches applied to one system > modifing the same function, livepatch will use the function enabled > on top of the function stack. However, we can not excatly know > which function of which patch is now enabling. > > This patch introduce one sysfs attribute of "using" to klp_func. > For example, if there are serval patches make changes to function > "meminfo_proc_show", the attribute "enabled" of all the patch is 1. > With this attribute, we can easily know the version enabling belongs > to which patch. > > cat /sys/kernel/livepatch/<patch1>/<object1>/<function1,sympos>/using -> 0 > means that the function1 of patch1 is disabled. > > cat /sys/kernel/livepatch/<patchN>/<object1>/<function1,sympos>/using -> 1 > means that the function1 of patchN is enabled. is this always correct though? See the logic in klp_ftrace_handler(). If there is a transition running, it is a little bit more complicated. Miroslav
