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-rw-r--r--init/Kconfig23
-rw-r--r--init/do_mounts.c7
-rw-r--r--init/do_mounts_initrd.c41
-rw-r--r--init/main.c35
4 files changed, 58 insertions, 48 deletions
diff --git a/init/Kconfig b/init/Kconfig
index ed6334dd5e7..89e4cf672df 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -496,6 +496,12 @@ config RCU_USER_QS
excluded from the global RCU state machine and thus doesn't
to keep the timer tick on for RCU.
+ Unless you want to hack and help the development of the full
+ tickless feature, you shouldn't enable this option. It adds
+ unnecessary overhead.
+
+ If unsure say N
+
config RCU_USER_QS_FORCE
bool "Force userspace extended QS by default"
depends on RCU_USER_QS
@@ -504,6 +510,12 @@ config RCU_USER_QS_FORCE
test this feature that treats userspace as an extended quiescent
state until we have a real user like a full adaptive nohz option.
+ Unless you want to hack and help the development of the full
+ tickless feature, you shouldn't enable this option. It adds
+ unnecessary overhead.
+
+ If unsure say N
+
config RCU_FANOUT
int "Tree-based hierarchical RCU fanout value"
range 2 64 if 64BIT
@@ -1125,10 +1137,12 @@ menuconfig EXPERT
environments which can tolerate a "non-standard" kernel.
Only use this if you really know what you are doing.
+config HAVE_UID16
+ bool
+
config UID16
bool "Enable 16-bit UID system calls" if EXPERT
- depends on ARM || BLACKFIN || CRIS || FRV || H8300 || X86_32 || M68K || (S390 && !64BIT) || SUPERH || SPARC32 || (SPARC64 && COMPAT) || UML || (X86_64 && IA32_EMULATION) \
- || AARCH32_EMULATION
+ depends on HAVE_UID16
default y
help
This enables the legacy 16-bit UID syscall wrappers.
@@ -1150,6 +1164,11 @@ config SYSCTL_SYSCALL
If unsure say N here.
+config SYSCTL_EXCEPTION_TRACE
+ bool
+ help
+ Enable support for /proc/sys/debug/exception-trace.
+
config KALLSYMS
bool "Load all symbols for debugging/ksymoops" if EXPERT
default y
diff --git a/init/do_mounts.c b/init/do_mounts.c
index d3f0aeed2d3..f8a66424360 100644
--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -353,8 +353,9 @@ static int __init do_mount_root(char *name, char *fs, int flags, void *data)
void __init mount_block_root(char *name, int flags)
{
- char *fs_names = __getname_gfp(GFP_KERNEL
- | __GFP_NOTRACK_FALSE_POSITIVE);
+ struct page *page = alloc_page(GFP_KERNEL |
+ __GFP_NOTRACK_FALSE_POSITIVE);
+ char *fs_names = page_address(page);
char *p;
#ifdef CONFIG_BLOCK
char b[BDEVNAME_SIZE];
@@ -406,7 +407,7 @@ retry:
#endif
panic("VFS: Unable to mount root fs on %s", b);
out:
- putname(fs_names);
+ put_page(page);
}
#ifdef CONFIG_ROOT_NFS
diff --git a/init/do_mounts_initrd.c b/init/do_mounts_initrd.c
index 135959a276b..5e4ded51788 100644
--- a/init/do_mounts_initrd.c
+++ b/init/do_mounts_initrd.c
@@ -16,13 +16,13 @@
#include <linux/initrd.h>
#include <linux/sched.h>
#include <linux/freezer.h>
+#include <linux/kmod.h>
#include "do_mounts.h"
unsigned long initrd_start, initrd_end;
int initrd_below_start_ok;
unsigned int real_root_dev; /* do_proc_dointvec cannot handle kdev_t */
-static int __initdata old_fd, root_fd;
static int __initdata mount_initrd = 1;
static int __init no_initrd(char *str)
@@ -33,33 +33,29 @@ static int __init no_initrd(char *str)
__setup("noinitrd", no_initrd);
-static int __init do_linuxrc(void *_shell)
+static int init_linuxrc(struct subprocess_info *info, struct cred *new)
{
- static const char *argv[] = { "linuxrc", NULL, };
- extern const char *envp_init[];
- const char *shell = _shell;
-
- sys_close(old_fd);sys_close(root_fd);
+ sys_unshare(CLONE_FS | CLONE_FILES);
+ /* move initrd over / and chdir/chroot in initrd root */
+ sys_chdir("/root");
+ sys_mount(".", "/", NULL, MS_MOVE, NULL);
+ sys_chroot(".");
sys_setsid();
- return kernel_execve(shell, argv, envp_init);
+ return 0;
}
static void __init handle_initrd(void)
{
+ static char *argv[] = { "linuxrc", NULL, };
+ extern char *envp_init[];
int error;
- int pid;
real_root_dev = new_encode_dev(ROOT_DEV);
create_dev("/dev/root.old", Root_RAM0);
/* mount initrd on rootfs' /root */
mount_block_root("/dev/root.old", root_mountflags & ~MS_RDONLY);
sys_mkdir("/old", 0700);
- root_fd = sys_open("/", 0, 0);
- old_fd = sys_open("/old", 0, 0);
- /* move initrd over / and chdir/chroot in initrd root */
- sys_chdir("/root");
- sys_mount(".", "/", NULL, MS_MOVE, NULL);
- sys_chroot(".");
+ sys_chdir("/old");
/*
* In case that a resume from disk is carried out by linuxrc or one of
@@ -67,27 +63,22 @@ static void __init handle_initrd(void)
*/
current->flags |= PF_FREEZER_SKIP;
- pid = kernel_thread(do_linuxrc, "/linuxrc", SIGCHLD);
- if (pid > 0)
- while (pid != sys_wait4(-1, NULL, 0, NULL))
- yield();
+ call_usermodehelper_fns("/linuxrc", argv, envp_init, UMH_WAIT_PROC,
+ init_linuxrc, NULL, NULL);
current->flags &= ~PF_FREEZER_SKIP;
/* move initrd to rootfs' /old */
- sys_fchdir(old_fd);
- sys_mount("/", ".", NULL, MS_MOVE, NULL);
+ sys_mount("..", ".", NULL, MS_MOVE, NULL);
/* switch root and cwd back to / of rootfs */
- sys_fchdir(root_fd);
- sys_chroot(".");
- sys_close(old_fd);
- sys_close(root_fd);
+ sys_chroot("..");
if (new_decode_dev(real_root_dev) == Root_RAM0) {
sys_chdir("/old");
return;
}
+ sys_chdir("/");
ROOT_DEV = new_decode_dev(real_root_dev);
mount_root();
diff --git a/init/main.c b/init/main.c
index db34c0ec471..9cf77ab138a 100644
--- a/init/main.c
+++ b/init/main.c
@@ -69,6 +69,7 @@
#include <linux/slab.h>
#include <linux/perf_event.h>
#include <linux/file.h>
+#include <linux/ptrace.h>
#include <asm/io.h>
#include <asm/bugs.h>
@@ -86,7 +87,6 @@ extern void init_IRQ(void);
extern void fork_init(unsigned long);
extern void mca_init(void);
extern void sbus_init(void);
-extern void prio_tree_init(void);
extern void radix_tree_init(void);
#ifndef CONFIG_DEBUG_RODATA
static inline void mark_rodata_ro(void) { }
@@ -547,7 +547,6 @@ asmlinkage void __init start_kernel(void)
/* init some links before init_ISA_irqs() */
early_irq_init();
init_IRQ();
- prio_tree_init();
init_timers();
hrtimers_init();
softirq_init();
@@ -793,17 +792,17 @@ static void __init do_pre_smp_initcalls(void)
do_one_initcall(*fn);
}
-static void run_init_process(const char *init_filename)
+static int run_init_process(const char *init_filename)
{
argv_init[0] = init_filename;
- kernel_execve(init_filename, argv_init, envp_init);
+ return kernel_execve(init_filename, argv_init, envp_init);
}
-/* This is a non __init function. Force it to be noinline otherwise gcc
- * makes it inline to init() and it becomes part of init.text section
- */
-static noinline int init_post(void)
+static void __init kernel_init_freeable(void);
+
+static int __ref kernel_init(void *unused)
{
+ kernel_init_freeable();
/* need to finish all async __init code before freeing the memory */
async_synchronize_full();
free_initmem();
@@ -815,7 +814,8 @@ static noinline int init_post(void)
flush_delayed_fput();
if (ramdisk_execute_command) {
- run_init_process(ramdisk_execute_command);
+ if (!run_init_process(ramdisk_execute_command))
+ return 0;
printk(KERN_WARNING "Failed to execute %s\n",
ramdisk_execute_command);
}
@@ -827,20 +827,22 @@ static noinline int init_post(void)
* trying to recover a really broken machine.
*/
if (execute_command) {
- run_init_process(execute_command);
+ if (!run_init_process(execute_command))
+ return 0;
printk(KERN_WARNING "Failed to execute %s. Attempting "
"defaults...\n", execute_command);
}
- run_init_process("/sbin/init");
- run_init_process("/etc/init");
- run_init_process("/bin/init");
- run_init_process("/bin/sh");
+ if (!run_init_process("/sbin/init") ||
+ !run_init_process("/etc/init") ||
+ !run_init_process("/bin/init") ||
+ !run_init_process("/bin/sh"))
+ return 0;
panic("No init found. Try passing init= option to kernel. "
"See Linux Documentation/init.txt for guidance.");
}
-static int __init kernel_init(void * unused)
+static void __init kernel_init_freeable(void)
{
/*
* Wait until kthreadd is all set-up.
@@ -895,7 +897,4 @@ static int __init kernel_init(void * unused)
* we're essentially up and running. Get rid of the
* initmem segments and start the user-mode stuff..
*/
-
- init_post();
- return 0;
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-24 19:31:21 +0000