path: root/init
diff options
Diffstat (limited to 'init')
3 files changed, 27 insertions, 9 deletions
diff --git a/init/Kconfig b/init/Kconfig
index a7e48796d57..e63a017c391 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -502,6 +502,15 @@ config VM_EVENT_COUNTERS
on EMBEDDED systems. /proc/vmstat will only show page counts
if VM event counters are disabled.
+config SLUB_DEBUG
+ default y
+ bool "Enable SLUB debugging support" if EMBEDDED
+ help
+ SLUB has extensive debug support features. Disabling these can
+ result in significant savings in code size. This also disables
+ SLUB sysfs support. /sys/slab will not exist and there will be
+ no support for cache validation etc.
prompt "Choose SLAB allocator"
default SLAB
@@ -512,9 +521,9 @@ config SLAB
bool "SLAB"
The regular slab allocator that is established and known to work
- well in all environments. It organizes chache hot objects in
+ well in all environments. It organizes cache hot objects in
per cpu and per node queues. SLAB is the default choice for
- slab allocator.
+ a slab allocator.
config SLUB
@@ -524,21 +533,20 @@ config SLUB
instead of managing queues of cached objects (SLAB approach).
Per cpu caching is realized using slabs of objects instead
of queues of objects. SLUB can use memory efficiently
- way and has enhanced diagnostics.
+ and has enhanced diagnostics.
config SLOB
-# SLOB cannot support SMP because SLAB_DESTROY_BY_RCU does not work
-# properly.
+# SLOB does not support SMP because SLAB_DESTROY_BY_RCU is unsupported
depends on EMBEDDED && !SMP && !SPARSEMEM
bool "SLOB (Simple Allocator)"
SLOB replaces the SLAB allocator with a drastically simpler
allocator. SLOB is more space efficient that SLAB but does not
- scale well (single lock for all operations) and is more susceptible
- to fragmentation. SLOB it is a great choice to reduce
- memory usage and code size for embedded systems.
+ scale well (single lock for all operations) and is also highly
+ susceptible to fragmentation. SLUB can accomplish a higher object
+ density. It is usually better to use SLUB instead of SLOB.
diff --git a/init/do_mounts.c b/init/do_mounts.c
index 3f57ed4599d..46fe407fb03 100644
--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -7,6 +7,7 @@
#include <linux/root_dev.h>
#include <linux/security.h>
#include <linux/delay.h>
+#include <linux/genhd.h>
#include <linux/mount.h>
#include <linux/device.h>
#include <linux/init.h>
@@ -308,17 +309,21 @@ retry:
* Allow the user to distinguish between failed sys_open
* and bad superblock on root device.
+ * and give them a list of the available devices
__bdevname(ROOT_DEV, b);
printk("VFS: Cannot open root device \"%s\" or %s\n",
root_device_name, b);
- printk("Please append a correct \"root=\" boot option\n");
+ printk("Please append a correct \"root=\" boot option; here are the available partitions:\n");
+ printk_all_partitions();
panic("VFS: Unable to mount root fs on %s", b);
+ printk("List of all partitions:\n");
+ printk_all_partitions();
printk("No filesystem could mount root, tried: ");
for (p = fs_names; *p; p += strlen(p)+1)
printk(" %s", p);
diff --git a/init/main.c b/init/main.c
index c1537e0ddce..e8d080cab44 100644
--- a/init/main.c
+++ b/init/main.c
@@ -54,6 +54,7 @@
#include <linux/lockdep.h>
#include <linux/pid_namespace.h>
#include <linux/device.h>
+#include <linux/kthread.h>
#include <asm/io.h>
#include <asm/bugs.h>
@@ -425,8 +426,12 @@ static void __init setup_command_line(char *command_line)
static void noinline rest_init(void)
+ int pid;
kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND);
+ pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES);
+ kthreadd_task = find_task_by_pid(pid);