Hi list and Herbert, In the process of upgrading our systems to new kernels with the new and shiny 4.1.35 patch, I run into the following gcc error when compiling the patched kernel. I *presume* that this is since implicit function declaration in the vserver code raise an error due to the -Werror=implicit-function-declaration parameter for gcc. However, this is with default gcc settings on Gentoo, so in principle (and to increase "user-friendliness" for those that want to use vserver), maybe it should just work out of the box? Anyway, if someone care to comment before I start diggin further, I would be glad. :) gcc is version 4.9.3 (Gentoo 4.9.3 p1.5, pie-0.6.4), on amd64. make output: [...] CC kernel/vserver/limit.o kernel/vserver/limit.c: In function ‘vx_vsi_meminfo’: kernel/vserver/limit.c:264:2: error: implicit declaration of function ‘mem_cgroup_from_task’ [-Werror=implicit-function-declaration] mcg = mem_cgroup_from_task(current); ^ kernel/vserver/limit.c:264:6: warning: assignment makes pointer from integer without a cast mcg = mem_cgroup_from_task(current); ^ kernel/vserver/limit.c:269:2: error: implicit declaration of function ‘mem_cgroup_mem_limit_pages’ [-Werror=implicit-function-declaration] res_limit = mem_cgroup_mem_limit_pages(mcg); ^ kernel/vserver/limit.c:270:2: error: implicit declaration of function ‘mem_cgroup_mem_usage_pages’ [-Werror=implicit-function-declaration] res_usage = mem_cgroup_mem_usage_pages(mcg); ^ cc1: some warnings being treated as errors scripts/Makefile.build:258: recipe for target 'kernel/vserver/limit.o' failed make[2]: *** [kernel/vserver/limit.o] Error 1 scripts/Makefile.build:403: recipe for target 'kernel/vserver' failed make[1]: *** [kernel/vserver] Error 2 Makefile:948: recipe for target 'kernel' failed make: *** [kernel] Error 2 - Tor Rune Skoglund