From: Holger Schurig Disable sysctl_check.c for embedded targets. This saves about about 11 kB in .text and another 11 kB in .data on a PXA255 embedded platform. Signed-off-by: Holger Schurig Cc: "Eric W. Biederman" Signed-off-by: Andrew Morton --- init/Kconfig | 11 +++++++++++ kernel/Makefile | 2 +- kernel/sysctl.c | 10 ++++++++-- 3 files changed, 20 insertions(+), 3 deletions(-) diff -puN init/Kconfig~sysctl-allow-embedded-targets-to-disable-sysctl_checkc init/Kconfig --- a/init/Kconfig~sysctl-allow-embedded-targets-to-disable-sysctl_checkc +++ a/init/Kconfig @@ -522,6 +522,17 @@ config SYSCTL_SYSCALL If unsure say Y here. +config SYSCTL_SYSCALL_CHECK + bool "Sysctl checks" if EMBEDDED + depends on SYSCTL_SYSCALL + default y + ---help--- + sys_sysctl uses binary paths that have been found challenging + to properly maintain and use. This enables checks that help + you to keep things correct. + + If unsure say Y here. + config KALLSYMS bool "Load all symbols for debugging/ksymoops" if EMBEDDED default y diff -puN kernel/Makefile~sysctl-allow-embedded-targets-to-disable-sysctl_checkc kernel/Makefile --- a/kernel/Makefile~sysctl-allow-embedded-targets-to-disable-sysctl_checkc +++ a/kernel/Makefile @@ -11,7 +11,7 @@ obj-y = sched.o fork.o exec_domain.o hrtimer.o rwsem.o nsproxy.o srcu.o \ notifier.o ksysfs.o pm_qos_params.o -obj-$(CONFIG_SYSCTL) += sysctl_check.o +obj-$(CONFIG_SYSCTL_SYSCALL_CHECK) += sysctl_check.o obj-$(CONFIG_STACKTRACE) += stacktrace.o obj-y += time/ obj-$(CONFIG_DEBUG_MUTEXES) += mutex-debug.o diff -puN kernel/sysctl.c~sysctl-allow-embedded-targets-to-disable-sysctl_checkc kernel/sysctl.c --- a/kernel/sysctl.c~sysctl-allow-embedded-targets-to-disable-sysctl_checkc +++ a/kernel/sysctl.c @@ -1612,9 +1612,13 @@ static void sysctl_set_parent(struct ctl static __init int sysctl_init(void) { - int err; sysctl_set_parent(NULL, root_table); - err = sysctl_check_table(current->nsproxy, root_table); +#ifdef CONFIG_SYSCTL_SYSCALL_CHECK + { + int err; + err = sysctl_check_table(current->nsproxy, root_table); + } +#endif return 0; } @@ -1741,10 +1745,12 @@ struct ctl_table_header *__register_sysc header->unregistering = NULL; header->root = root; sysctl_set_parent(NULL, header->ctl_table); +#ifdef CONFIG_SYSCTL_SYSCALL_CHECK if (sysctl_check_table(namespaces, header->ctl_table)) { kfree(header); return NULL; } +#endif spin_lock(&sysctl_lock); header_list = lookup_header_list(root, namespaces); list_add_tail(&header->ctl_entry, header_list); _