sysctl: allow embedded targets to disable sysctl_check.c

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 <hs4233@mail.mn-solutions.de>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/init/Kconfig b/init/Kconfig
index 98fa96e..3e7b257 100644 (file)
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -550,6 +550,17 @@ 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 --git a/kernel/Makefile b/kernel/Makefile
index 6c5f081..188c432 100644 (file)
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -11,7 +11,7 @@ obj-y     = sched.o fork.o exec_domain.o panic.o printk.o profile.o \
            hrtimer.o rwsem.o nsproxy.o srcu.o semaphore.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 --git a/kernel/sysctl.c b/kernel/sysctl.c
index 0a1d273..1cdfe94 100644 (file)
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1592,9 +1592,13 @@ static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
 
 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;
 }
 
@@ -1721,10 +1725,12 @@ struct ctl_table_header *__register_sysctl_paths(
        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);