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-rw-r--r--init/Kconfig45
-rw-r--r--init/calibrate.c13
-rw-r--r--init/do_mounts.c45
-rw-r--r--init/main.c2
4 files changed, 80 insertions, 25 deletions
diff --git a/init/Kconfig b/init/Kconfig
index 63c67de99c10..3ecd8a1178f1 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -470,6 +470,7 @@ config TREE_RCU
config TREE_PREEMPT_RCU
bool "Preemptible tree-based hierarchical RCU"
depends on PREEMPT
+ select IRQ_WORK
help
This option selects the RCU implementation that is
designed for very large SMP systems with hundreds or
@@ -527,13 +528,29 @@ config RCU_USER_QS
config CONTEXT_TRACKING_FORCE
bool "Force context tracking"
depends on CONTEXT_TRACKING
- default CONTEXT_TRACKING
+ default y if !NO_HZ_FULL
help
- Probe on user/kernel boundaries by default in order to
- test the features that rely on it such as userspace RCU extended
- quiescent states.
- This test is there for debugging until we have a real user like the
- full dynticks mode.
+ The major pre-requirement for full dynticks to work is to
+ support the context tracking subsystem. But there are also
+ other dependencies to provide in order to make the full
+ dynticks working.
+
+ This option stands for testing when an arch implements the
+ context tracking backend but doesn't yet fullfill all the
+ requirements to make the full dynticks feature working.
+ Without the full dynticks, there is no way to test the support
+ for context tracking and the subsystems that rely on it: RCU
+ userspace extended quiescent state and tickless cputime
+ accounting. This option copes with the absence of the full
+ dynticks subsystem by forcing the context tracking on all
+ CPUs in the system.
+
+ Say Y only if you're working on the developpement of an
+ architecture backend for the context tracking.
+
+ Say N otherwise, this option brings an overhead that you
+ don't want in production.
+
config RCU_FANOUT
int "Tree-based hierarchical RCU fanout value"
@@ -955,7 +972,7 @@ config MEMCG_SWAP_ENABLED
Memory Resource Controller Swap Extension comes with its price in
a bigger memory consumption. General purpose distribution kernels
which want to enable the feature but keep it disabled by default
- and let the user enable it by swapaccount boot command line
+ and let the user enable it by swapaccount=1 boot command line
parameter should have this option unselected.
For those who want to have the feature enabled by default should
select this option (if, for some reason, they need to disable it
@@ -1106,7 +1123,6 @@ config IPC_NS
config USER_NS
bool "User namespace"
- depends on UIDGID_CONVERTED
select UIDGID_STRICT_TYPE_CHECKS
default n
@@ -1140,20 +1156,8 @@ config NET_NS
endif # NAMESPACES
-config UIDGID_CONVERTED
- # True if all of the selected software conmponents are known
- # to have uid_t and gid_t converted to kuid_t and kgid_t
- # where appropriate and are otherwise safe to use with
- # the user namespace.
- bool
- default y
-
- # Filesystems
- depends on XFS_FS = n
-
config UIDGID_STRICT_TYPE_CHECKS
bool "Require conversions between uid/gids and their internal representation"
- depends on UIDGID_CONVERTED
default n
help
While the nececessary conversions are being added to all subsystems this option allows
@@ -1666,6 +1670,7 @@ config BASE_SMALL
menuconfig MODULES
bool "Enable loadable module support"
+ option modules
help
Kernel modules are small pieces of compiled code which can
be inserted in the running kernel, rather than being
diff --git a/init/calibrate.c b/init/calibrate.c
index fda0a7b0f06c..520702db9acc 100644
--- a/init/calibrate.c
+++ b/init/calibrate.c
@@ -31,7 +31,7 @@ __setup("lpj=", lpj_setup);
#define DELAY_CALIBRATION_TICKS ((HZ < 100) ? 1 : (HZ/100))
#define MAX_DIRECT_CALIBRATION_RETRIES 5
-static unsigned long __cpuinit calibrate_delay_direct(void)
+static unsigned long calibrate_delay_direct(void)
{
unsigned long pre_start, start, post_start;
unsigned long pre_end, end, post_end;
@@ -166,7 +166,10 @@ static unsigned long __cpuinit calibrate_delay_direct(void)
return 0;
}
#else
-static unsigned long __cpuinit calibrate_delay_direct(void) {return 0;}
+static unsigned long calibrate_delay_direct(void)
+{
+ return 0;
+}
#endif
/*
@@ -180,7 +183,7 @@ static unsigned long __cpuinit calibrate_delay_direct(void) {return 0;}
*/
#define LPS_PREC 8
-static unsigned long __cpuinit calibrate_delay_converge(void)
+static unsigned long calibrate_delay_converge(void)
{
/* First stage - slowly accelerate to find initial bounds */
unsigned long lpj, lpj_base, ticks, loopadd, loopadd_base, chop_limit;
@@ -254,12 +257,12 @@ static DEFINE_PER_CPU(unsigned long, cpu_loops_per_jiffy) = { 0 };
* Architectures should override this function if a faster calibration
* method is available.
*/
-unsigned long __attribute__((weak)) __cpuinit calibrate_delay_is_known(void)
+unsigned long __attribute__((weak)) calibrate_delay_is_known(void)
{
return 0;
}
-void __cpuinit calibrate_delay(void)
+void calibrate_delay(void)
{
unsigned long lpj;
static bool printed;
diff --git a/init/do_mounts.c b/init/do_mounts.c
index 816014c4627e..a51cddc2ff8c 100644
--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -26,6 +26,8 @@
#include <linux/async.h>
#include <linux/fs_struct.h>
#include <linux/slab.h>
+#include <linux/ramfs.h>
+#include <linux/shmem_fs.h>
#include <linux/nfs_fs.h>
#include <linux/nfs_fs_sb.h>
@@ -588,3 +590,46 @@ out:
sys_mount(".", "/", NULL, MS_MOVE, NULL);
sys_chroot(".");
}
+
+static bool is_tmpfs;
+static struct dentry *rootfs_mount(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *data)
+{
+ static unsigned long once;
+ void *fill = ramfs_fill_super;
+
+ if (test_and_set_bit(0, &once))
+ return ERR_PTR(-ENODEV);
+
+ if (IS_ENABLED(CONFIG_TMPFS) && is_tmpfs)
+ fill = shmem_fill_super;
+
+ return mount_nodev(fs_type, flags, data, fill);
+}
+
+static struct file_system_type rootfs_fs_type = {
+ .name = "rootfs",
+ .mount = rootfs_mount,
+ .kill_sb = kill_litter_super,
+};
+
+int __init init_rootfs(void)
+{
+ int err = register_filesystem(&rootfs_fs_type);
+
+ if (err)
+ return err;
+
+ if (IS_ENABLED(CONFIG_TMPFS) && !saved_root_name[0] &&
+ (!root_fs_names || strstr(root_fs_names, "tmpfs"))) {
+ err = shmem_init();
+ is_tmpfs = true;
+ } else {
+ err = init_ramfs_fs();
+ }
+
+ if (err)
+ unregister_filesystem(&rootfs_fs_type);
+
+ return err;
+}
diff --git a/init/main.c b/init/main.c
index d03d2ec2eacf..af310afbef28 100644
--- a/init/main.c
+++ b/init/main.c
@@ -75,6 +75,7 @@
#include <linux/blkdev.h>
#include <linux/elevator.h>
#include <linux/sched_clock.h>
+#include <linux/context_tracking.h>
#include <asm/io.h>
#include <asm/bugs.h>
@@ -545,6 +546,7 @@ asmlinkage void __init start_kernel(void)
idr_init_cache();
rcu_init();
tick_nohz_init();
+ context_tracking_init();
radix_tree_init();
/* init some links before init_ISA_irqs() */
early_irq_init();