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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal

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Pull third pile of kernel_execve() patches from Al Viro:
 "The last bits of infrastructure for kernel_thread() et.al., with
  alpha/arm/x86 use of those.  Plus sanitizing the asm glue and
  do_notify_resume() on alpha, fixing the "disabled irq while running
  task_work stuff" breakage there.

  At that point the rest of kernel_thread/kernel_execve/sys_execve work
  can be done independently for different architectures.  The only
  pending bits that do depend on having all architectures converted are
  restrictred to fs/* and kernel/* - that'll obviously have to wait for
  the next cycle.

  I thought we'd have to wait for all of them done before we start
  eliminating the longjump-style insanity in kernel_execve(), but it
  turned out there's a very simple way to do that without flagday-style
  changes."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal:
  alpha: switch to saner kernel_execve() semantics
  arm: switch to saner kernel_execve() semantics
  x86, um: convert to saner kernel_execve() semantics
  infrastructure for saner ret_from_kernel_thread semantics
  make sure that kernel_thread() callbacks call do_exit() themselves
  make sure that we always have a return path from kernel_execve()
  ppc: eeh_event should just use kthread_run()
  don't bother with kernel_thread/kernel_execve for launching linuxrc
  alpha: get rid of switch_stack argument of do_work_pending()
  alpha: don't bother passing switch_stack separately from regs
  alpha: take SIGPENDING/NOTIFY_RESUME loop into signal.c
  alpha: simplify TIF_NEED_RESCHED handling
This commit is contained in:
Linus Torvalds
2012-10-13 10:05:52 +09:00
parent 8418263e35 5522be6a46
commit 4e21fc138b
25 changed files with 137 additions and 223 deletions
Download Patch File Download Diff File Expand all files Collapse all files
init/do_mounts_initrd.c
+16 -25
View File
@@ -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();
init/main.c
+17 -16
View File
@@ -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>
@@ -791,17 +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();
@@ -813,7 +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);
}
@@ -825,20 +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.
@@ -893,7 +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;
}