Commit bdb6231e88a3 ("mm/memfd: add MFD_NOEXEC_SEAL and MFD_EXEC") on mm-unstable when CONFIG_SYSCTL or CONFIG_MEMFD_CRETE not defined, as below, because initialize_memfd_noexec_scope() and register_pid_ns_sysctl_table_vm(), which defined by the commit, is not defined for the config case. ERROR:root:/kernel/pid_namespace.c: In function ‘create_pid_namespace’: /kernel/pid_namespace.c:114:2: error: implicit declaration of function ‘initialize_memfd_noexec_scope’; did you mean ‘set_memfd_noexec_scope’? [-Werror=implicit-function-declaration] 114 | initialize_memfd_noexec_scope(ns); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | set_memfd_noexec_scope /kernel/pid_namespace.c: In function ‘pid_namespaces_init’: /kernel/pid_namespace.c:462:2: error: implicit declaration of function ‘register_pid_ns_sysctl_table_vm’; did you mean ‘register_pid_ns_ctl_table_vm’? [-Werror=implicit-function-declaration] 462 | register_pid_ns_sysctl_table_vm(); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | register_pid_ns_ctl_table_vm cc1: some warnings being treated as errors make[3]: *** [/scripts/Makefile.build:250: kernel/pid_namespace.o] Error 1 Fix the commit by defining the functions for the configuration. Fixes: bdb6231e88a3 ("mm/memfd: add MFD_NOEXEC_SEAL and MFD_EXEC") on mm-unstable Signed-off-by: SeongJae Park <sj@xxxxxxxxxx> --- kernel/pid_sysctl.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/pid_sysctl.h b/kernel/pid_sysctl.h index 90a93161a122..770c060a0d33 100644 --- a/kernel/pid_sysctl.h +++ b/kernel/pid_sysctl.h @@ -52,8 +52,10 @@ static inline void register_pid_ns_sysctl_table_vm(void) register_sysctl_paths(vm_path, pid_ns_ctl_table_vm); } #else +static inline void initialize_memfd_noexec_scope(struct pid_namespace *ns) {} static inline void set_memfd_noexec_scope(struct pid_namespace *ns) {} static inline void register_pid_ns_ctl_table_vm(void) {} +static inline void register_pid_ns_sysctl_table_vm(void) {} #endif #endif /* LINUX_PID_SYSCTL_H */ -- 2.25.1