diff --git a/block/elevator.c b/block/elevator.c index 9edba1b8323ed713f17f475511a370d2cdd8df47..c2d61d56e0b7dc751bd629477bb4c092525841f7 100644 --- a/block/elevator.c +++ b/block/elevator.c @@ -136,6 +136,22 @@ static int __init elevator_setup(char *str) __setup("elevator=", elevator_setup); +/* called during boot to load the elevator chosen by the elevator param */ +void __init load_default_elevator_module(void) +{ + struct elevator_type *e; + + if (!chosen_elevator[0]) + return; + + spin_lock(&elv_list_lock); + e = elevator_find(chosen_elevator); + spin_unlock(&elv_list_lock); + + if (!e) + request_module("%s-iosched", chosen_elevator); +} + static struct kobj_type elv_ktype; static struct elevator_queue *elevator_alloc(struct request_queue *q, diff --git a/include/linux/elevator.h b/include/linux/elevator.h index c03af7687bb4fdd916d5bf3c835e801376132392..18662063175044e4641610799d48422e3cd583f0 100644 --- a/include/linux/elevator.h +++ b/include/linux/elevator.h @@ -138,6 +138,7 @@ extern void elv_drain_elevator(struct request_queue *); /* * io scheduler registration */ +extern void __init load_default_elevator_module(void); extern int elv_register(struct elevator_type *); extern void elv_unregister(struct elevator_type *); @@ -206,5 +207,9 @@ enum { INIT_LIST_HEAD(&(rq)->csd.list); \ } while (0) +#else /* CONFIG_BLOCK */ + +static inline void load_default_elevator_module(void) { } + #endif /* CONFIG_BLOCK */ #endif diff --git a/include/linux/init.h b/include/linux/init.h index a799273714accff40c0bf54850389b095746ff83..9230c9408d8b6387aa784e49efc4b76d7551894e 100644 --- a/include/linux/init.h +++ b/include/linux/init.h @@ -161,6 +161,7 @@ extern unsigned int reset_devices; /* used by init/main.c */ void setup_arch(char **); void prepare_namespace(void); +void __init load_default_modules(void); extern void (*late_time_init)(void); diff --git a/init/do_mounts_initrd.c b/init/do_mounts_initrd.c index 5e4ded51788eb81f277c0b5674f5602730220df4..dfe606a7dd61abbdc289cb87bf5e8631b31a2e3f 100644 --- a/init/do_mounts_initrd.c +++ b/init/do_mounts_initrd.c @@ -57,6 +57,9 @@ static void __init handle_initrd(void) sys_mkdir("/old", 0700); sys_chdir("/old"); + /* try loading default modules from initrd */ + load_default_modules(); + /* * In case that a resume from disk is carried out by linuxrc or one of * its children, we need to tell the freezer not to wait for us. diff --git a/init/initramfs.c b/init/initramfs.c index 84c6bf111300878a095a9fb3f8f91678dbe10b65..a67ef9dbda9dae0ea7a1619a393c55157a6d8592 100644 --- a/init/initramfs.c +++ b/init/initramfs.c @@ -592,7 +592,7 @@ static int __init populate_rootfs(void) initrd_end - initrd_start); if (!err) { free_initrd(); - return 0; + goto done; } else { clean_rootfs(); unpack_to_rootfs(__initramfs_start, __initramfs_size); @@ -607,6 +607,7 @@ static int __init populate_rootfs(void) sys_close(fd); free_initrd(); } + done: #else printk(KERN_INFO "Unpacking initramfs...\n"); err = unpack_to_rootfs((char *)initrd_start, @@ -615,6 +616,11 @@ static int __init populate_rootfs(void) printk(KERN_EMERG "Initramfs unpacking failed: %s\n", err); free_initrd(); #endif + /* + * Try loading default modules from initramfs. This gives + * us a chance to load before device_initcalls. + */ + load_default_modules(); } return 0; } diff --git a/init/main.c b/init/main.c index baf1f0f5c4611eb08b3f0eae7995c5d789f8e741..18efadb11cf6c962ee639965ef66ea07e782a881 100644 --- a/init/main.c +++ b/init/main.c @@ -70,6 +70,8 @@ #include #include #include +#include +#include #include #include @@ -794,6 +796,17 @@ static void __init do_pre_smp_initcalls(void) do_one_initcall(*fn); } +/* + * This function requests modules which should be loaded by default and is + * called twice right after initrd is mounted and right before init is + * exec'd. If such modules are on either initrd or rootfs, they will be + * loaded before control is passed to userland. + */ +void __init load_default_modules(void) +{ + load_default_elevator_module(); +} + static int run_init_process(const char *init_filename) { argv_init[0] = init_filename; @@ -898,4 +911,7 @@ static void __init kernel_init_freeable(void) * we're essentially up and running. Get rid of the * initmem segments and start the user-mode stuff.. */ + + /* rootfs is available now, try loading default modules */ + load_default_modules(); }