From: Arnd Bergmann Date: Mon, 14 Mar 2016 23:21:06 +0000 (+0100) Subject: cgroup: avoid false positive gcc-6 warning X-Git-Tag: v4.6-rc1~92^2 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=cfe02a8a973e7e5f66926b8ae38dfce404b19e29;p=karo-tx-linux.git cgroup: avoid false positive gcc-6 warning When all subsystems are disabled, gcc notices that cgroup_subsys_enabled_key is a zero-length array and that any access to it must be out of bounds: In file included from ../include/linux/cgroup.h:19:0, from ../kernel/cgroup.c:31: ../kernel/cgroup.c: In function 'cgroup_add_cftypes': ../kernel/cgroup.c:261:53: error: array subscript is above array bounds [-Werror=array-bounds] return static_key_enabled(cgroup_subsys_enabled_key[ssid]); ~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~ ../include/linux/jump_label.h:271:40: note: in definition of macro 'static_key_enabled' static_key_count((struct static_key *)x) > 0; \ ^ We should never call the function in this particular case, so this is not a bug. In order to silence the warning, this adds an explicit check for the CGROUP_SUBSYS_COUNT==0 case. Signed-off-by: Arnd Bergmann Signed-off-by: Tejun Heo --- diff --git a/kernel/cgroup.c b/kernel/cgroup.c index d57318950076..3fe02c152799 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -246,6 +246,9 @@ static int cgroup_addrm_files(struct cgroup_subsys_state *css, */ static bool cgroup_ssid_enabled(int ssid) { + if (CGROUP_SUBSYS_COUNT == 0) + return false; + return static_key_enabled(cgroup_subsys_enabled_key[ssid]); }