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-rw-r--r--init/Kconfig98
-rw-r--r--init/do_mounts.c4
-rw-r--r--init/do_mounts_initrd.c7
-rw-r--r--init/init_task.c2
-rw-r--r--init/initramfs.c8
-rw-r--r--init/main.c24
6 files changed, 86 insertions, 57 deletions
diff --git a/init/Kconfig b/init/Kconfig
index 523bee15fb44..28c5b9dcc91e 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -20,12 +20,8 @@ config CONSTRUCTORS
bool
depends on !UML
-config HAVE_IRQ_WORK
- bool
-
config IRQ_WORK
bool
- depends on HAVE_IRQ_WORK
config BUILDTIME_EXTABLE_SORT
bool
@@ -33,35 +29,8 @@ config BUILDTIME_EXTABLE_SORT
menu "General setup"
config EXPERIMENTAL
- bool "Prompt for development and/or incomplete code/drivers"
- ---help---
- Some of the various things that Linux supports (such as network
- drivers, file systems, network protocols, etc.) can be in a state
- of development where the functionality, stability, or the level of
- testing is not yet high enough for general use. This is usually
- known as the "alpha-test" phase among developers. If a feature is
- currently in alpha-test, then the developers usually discourage
- uninformed widespread use of this feature by the general public to
- avoid "Why doesn't this work?" type mail messages. However, active
- testing and use of these systems is welcomed. Just be aware that it
- may not meet the normal level of reliability or it may fail to work
- in some special cases. Detailed bug reports from people familiar
- with the kernel internals are usually welcomed by the developers
- (before submitting bug reports, please read the documents
- <file:README>, <file:MAINTAINERS>, <file:REPORTING-BUGS>,
- <file:Documentation/BUG-HUNTING>, and
- <file:Documentation/oops-tracing.txt> in the kernel source).
-
- This option will also make obsoleted drivers available. These are
- drivers that have been replaced by something else, and/or are
- scheduled to be removed in a future kernel release.
-
- Unless you intend to help test and develop a feature or driver that
- falls into this category, or you have a situation that requires
- using these features, you should probably say N here, which will
- cause the configurator to present you with fewer choices. If
- you say Y here, you will be offered the choice of using features or
- drivers that are currently considered to be in the alpha-test phase.
+ bool
+ default y
config BROKEN
bool
@@ -247,7 +216,7 @@ config SYSVIPC_SYSCTL
config POSIX_MQUEUE
bool "POSIX Message Queues"
- depends on NET && EXPERIMENTAL
+ depends on NET
---help---
POSIX variant of message queues is a part of IPC. In POSIX message
queues every message has a priority which decides about succession
@@ -326,10 +295,13 @@ source "kernel/time/Kconfig"
menu "CPU/Task time and stats accounting"
+config VIRT_CPU_ACCOUNTING
+ bool
+
choice
prompt "Cputime accounting"
default TICK_CPU_ACCOUNTING if !PPC64
- default VIRT_CPU_ACCOUNTING if PPC64
+ default VIRT_CPU_ACCOUNTING_NATIVE if PPC64
# Kind of a stub config for the pure tick based cputime accounting
config TICK_CPU_ACCOUNTING
@@ -342,9 +314,10 @@ config TICK_CPU_ACCOUNTING
If unsure, say Y.
-config VIRT_CPU_ACCOUNTING
+config VIRT_CPU_ACCOUNTING_NATIVE
bool "Deterministic task and CPU time accounting"
depends on HAVE_VIRT_CPU_ACCOUNTING
+ select VIRT_CPU_ACCOUNTING
help
Select this option to enable more accurate task and CPU time
accounting. This is done by reading a CPU counter on each
@@ -354,6 +327,23 @@ config VIRT_CPU_ACCOUNTING
this also enables accounting of stolen time on logically-partitioned
systems.
+config VIRT_CPU_ACCOUNTING_GEN
+ bool "Full dynticks CPU time accounting"
+ depends on HAVE_CONTEXT_TRACKING && 64BIT
+ select VIRT_CPU_ACCOUNTING
+ select CONTEXT_TRACKING
+ help
+ Select this option to enable task and CPU time accounting on full
+ dynticks systems. This accounting is implemented by watching every
+ kernel-user boundaries using the context tracking subsystem.
+ The accounting is thus performed at the expense of some significant
+ overhead.
+
+ For now this is only useful if you are working on the full
+ dynticks subsystem development.
+
+ If unsure, say N.
+
config IRQ_TIME_ACCOUNTING
bool "Fine granularity task level IRQ time accounting"
depends on HAVE_IRQ_TIME_ACCOUNTING
@@ -393,7 +383,7 @@ config BSD_PROCESS_ACCT_V3
at <http://www.gnu.org/software/acct/>.
config TASKSTATS
- bool "Export task/process statistics through netlink (EXPERIMENTAL)"
+ bool "Export task/process statistics through netlink"
depends on NET
default n
help
@@ -406,7 +396,7 @@ config TASKSTATS
Say N if unsure.
config TASK_DELAY_ACCT
- bool "Enable per-task delay accounting (EXPERIMENTAL)"
+ bool "Enable per-task delay accounting"
depends on TASKSTATS
help
Collect information on time spent by a task waiting for system
@@ -417,7 +407,7 @@ config TASK_DELAY_ACCT
Say N if unsure.
config TASK_XACCT
- bool "Enable extended accounting over taskstats (EXPERIMENTAL)"
+ bool "Enable extended accounting over taskstats"
depends on TASKSTATS
help
Collect extended task accounting data and send the data
@@ -426,7 +416,7 @@ config TASK_XACCT
Say N if unsure.
config TASK_IO_ACCOUNTING
- bool "Enable per-task storage I/O accounting (EXPERIMENTAL)"
+ bool "Enable per-task storage I/O accounting"
depends on TASK_XACCT
help
Collect information on the number of bytes of storage I/O which this
@@ -453,7 +443,7 @@ config TREE_RCU
config TREE_PREEMPT_RCU
bool "Preemptible tree-based hierarchical RCU"
- depends on PREEMPT && SMP
+ depends on PREEMPT
help
This option selects the RCU implementation that is
designed for very large SMP systems with hundreds or
@@ -461,6 +451,8 @@ config TREE_PREEMPT_RCU
is also required. It also scales down nicely to
smaller systems.
+ Select this option if you are unsure.
+
config TINY_RCU
bool "UP-only small-memory-footprint RCU"
depends on !PREEMPT && !SMP
@@ -486,6 +478,14 @@ config PREEMPT_RCU
This option enables preemptible-RCU code that is common between
the TREE_PREEMPT_RCU and TINY_PREEMPT_RCU implementations.
+config RCU_STALL_COMMON
+ def_bool ( TREE_RCU || TREE_PREEMPT_RCU || RCU_TRACE )
+ help
+ This option enables RCU CPU stall code that is common between
+ the TINY and TREE variants of RCU. The purpose is to allow
+ the tiny variants to disable RCU CPU stall warnings, while
+ making these warnings mandatory for the tree variants.
+
config CONTEXT_TRACKING
bool
@@ -880,8 +880,8 @@ config MEMCG_SWAP_ENABLED
select this option (if, for some reason, they need to disable it
then swapaccount=0 does the trick).
config MEMCG_KMEM
- bool "Memory Resource Controller Kernel Memory accounting (EXPERIMENTAL)"
- depends on MEMCG && EXPERIMENTAL
+ bool "Memory Resource Controller Kernel Memory accounting"
+ depends on MEMCG
depends on SLUB || SLAB
help
The Kernel Memory extension for Memory Resource Controller can limit
@@ -893,7 +893,7 @@ config MEMCG_KMEM
config CGROUP_HUGETLB
bool "HugeTLB Resource Controller for Control Groups"
- depends on RESOURCE_COUNTERS && HUGETLB_PAGE && EXPERIMENTAL
+ depends on RESOURCE_COUNTERS && HUGETLB_PAGE
default n
help
Provides a cgroup Resource Controller for HugeTLB pages.
@@ -932,7 +932,6 @@ config FAIR_GROUP_SCHED
config CFS_BANDWIDTH
bool "CPU bandwidth provisioning for FAIR_GROUP_SCHED"
- depends on EXPERIMENTAL
depends on FAIR_GROUP_SCHED
default n
help
@@ -944,7 +943,6 @@ config CFS_BANDWIDTH
config RT_GROUP_SCHED
bool "Group scheduling for SCHED_RR/FIFO"
- depends on EXPERIMENTAL
depends on CGROUP_SCHED
default n
help
@@ -1026,8 +1024,7 @@ config IPC_NS
different IPC objects in different namespaces.
config USER_NS
- bool "User namespace (EXPERIMENTAL)"
- depends on EXPERIMENTAL
+ bool "User namespace"
depends on UIDGID_CONVERTED
select UIDGID_STRICT_TYPE_CHECKS
@@ -1182,7 +1179,7 @@ config CC_OPTIMIZE_FOR_SIZE
Enabling this option will pass "-Os" instead of "-O2" to gcc
resulting in a smaller kernel.
- If unsure, say Y.
+ If unsure, say N.
config SYSCTL
bool
@@ -1270,6 +1267,7 @@ config HOTPLUG
config PRINTK
default y
bool "Enable support for printk" if EXPERT
+ select IRQ_WORK
help
This option enables normal printk support. Removing it
eliminates most of the message strings from the kernel image
@@ -1615,7 +1613,7 @@ config MODULE_UNLOAD
config MODULE_FORCE_UNLOAD
bool "Forced module unloading"
- depends on MODULE_UNLOAD && EXPERIMENTAL
+ depends on MODULE_UNLOAD
help
This option allows you to force a module to unload, even if the
kernel believes it is unsafe: the kernel will remove the module
diff --git a/init/do_mounts.c b/init/do_mounts.c
index 1d1b6348f903..a2b49f2c1bd8 100644
--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -81,9 +81,9 @@ struct uuidcmp {
*
* Returns 1 if the device matches, and 0 otherwise.
*/
-static int match_dev_by_uuid(struct device *dev, void *data)
+static int match_dev_by_uuid(struct device *dev, const void *data)
{
- struct uuidcmp *cmp = data;
+ const struct uuidcmp *cmp = data;
struct hd_struct *part = dev_to_part(dev);
if (!part->info)
diff --git a/init/do_mounts_initrd.c b/init/do_mounts_initrd.c
index 5e4ded51788e..a32ec1ce882b 100644
--- a/init/do_mounts_initrd.c
+++ b/init/do_mounts_initrd.c
@@ -36,6 +36,10 @@ __setup("noinitrd", no_initrd);
static int init_linuxrc(struct subprocess_info *info, struct cred *new)
{
sys_unshare(CLONE_FS | CLONE_FILES);
+ /* stdin/stdout/stderr for /linuxrc */
+ sys_open("/dev/console", O_RDWR, 0);
+ sys_dup(0);
+ sys_dup(0);
/* move initrd over / and chdir/chroot in initrd root */
sys_chdir("/root");
sys_mount(".", "/", NULL, MS_MOVE, NULL);
@@ -57,6 +61,9 @@ 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/init_task.c b/init/init_task.c
index 8b2f3996b035..ba0a7f362d9e 100644
--- a/init/init_task.c
+++ b/init/init_task.c
@@ -2,6 +2,8 @@
#include <linux/export.h>
#include <linux/mqueue.h>
#include <linux/sched.h>
+#include <linux/sched/sysctl.h>
+#include <linux/sched/rt.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/mm.h>
diff --git a/init/initramfs.c b/init/initramfs.c
index 84c6bf111300..a67ef9dbda9d 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 85d69dffe864..63534a141b4e 100644
--- a/init/main.c
+++ b/init/main.c
@@ -70,6 +70,8 @@
#include <linux/perf_event.h>
#include <linux/file.h>
#include <linux/ptrace.h>
+#include <linux/blkdev.h>
+#include <linux/elevator.h>
#include <asm/io.h>
#include <asm/bugs.h>
@@ -604,7 +606,7 @@ asmlinkage void __init start_kernel(void)
pidmap_init();
anon_vma_init();
#ifdef CONFIG_X86
- if (efi_enabled)
+ if (efi_enabled(EFI_RUNTIME_SERVICES))
efi_enter_virtual_mode();
#endif
thread_info_cache_init();
@@ -632,7 +634,7 @@ asmlinkage void __init start_kernel(void)
acpi_early_init(); /* before LAPIC and SMP init */
sfi_init_late();
- if (efi_enabled) {
+ if (efi_enabled(EFI_RUNTIME_SERVICES)) {
efi_late_init();
efi_free_boot_services();
}
@@ -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;
@@ -802,7 +815,7 @@ static int run_init_process(const char *init_filename)
(const char __user *const __user *)envp_init);
}
-static void __init kernel_init_freeable(void);
+static noinline void __init kernel_init_freeable(void);
static int __ref kernel_init(void *unused)
{
@@ -845,7 +858,7 @@ static int __ref kernel_init(void *unused)
"See Linux Documentation/init.txt for guidance.");
}
-static void __init kernel_init_freeable(void)
+static noinline void __init kernel_init_freeable(void)
{
/*
* Wait until kthreadd is all set-up.
@@ -900,4 +913,7 @@ 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();
}