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-rw-r--r--include/asm-generic/vmlinux.lds.h2
-rw-r--r--include/linux/init.h7
-rw-r--r--init/main.c13
3 files changed, 20 insertions, 2 deletions
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index 729f6b0a60e9..9cd44b162ba1 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -359,6 +359,8 @@
}
#define INITCALLS \
+ *(.initcallearly.init) \
+ __early_initcall_end = .; \
*(.initcall0.init) \
*(.initcall0s.init) \
*(.initcall1.init) \
diff --git a/include/linux/init.h b/include/linux/init.h
index 42ae95411a93..11b84e106053 100644
--- a/include/linux/init.h
+++ b/include/linux/init.h
@@ -170,6 +170,13 @@ extern void (*late_time_init)(void);
__attribute__((__section__(".initcall" level ".init"))) = fn
/*
+ * Early initcalls run before initializing SMP.
+ *
+ * Only for built-in code, not modules.
+ */
+#define early_initcall(fn) __define_initcall("early",fn,early)
+
+/*
* A "pure" initcall has no dependencies on anything else, and purely
* initializes variables that couldn't be statically initialized.
*
diff --git a/init/main.c b/init/main.c
index 0604cbcaf1e4..b6fec08dbbef 100644
--- a/init/main.c
+++ b/init/main.c
@@ -743,13 +743,13 @@ static void __init do_one_initcall(initcall_t fn)
}
-extern initcall_t __initcall_start[], __initcall_end[];
+extern initcall_t __initcall_start[], __initcall_end[], __early_initcall_end[];
static void __init do_initcalls(void)
{
initcall_t *call;
- for (call = __initcall_start; call < __initcall_end; call++)
+ for (call = __early_initcall_end; call < __initcall_end; call++)
do_one_initcall(*call);
/* Make sure there is no pending stuff from the initcall sequence */
@@ -783,6 +783,14 @@ static int __init nosoftlockup_setup(char *str)
}
__setup("nosoftlockup", nosoftlockup_setup);
+static void __init __do_pre_smp_initcalls(void)
+{
+ initcall_t *call;
+
+ for (call = __initcall_start; call < __early_initcall_end; call++)
+ do_one_initcall(*call);
+}
+
static void __init do_pre_smp_initcalls(void)
{
extern int spawn_ksoftirqd(void);
@@ -865,6 +873,7 @@ static int __init kernel_init(void * unused)
smp_prepare_cpus(setup_max_cpus);
+ __do_pre_smp_initcalls();
do_pre_smp_initcalls();
smp_init();