0983a88b9f
It turns out that if there's a panic early enough, UML will just sit there in the LED-blinking loop because the panic notifier hadn't been installed yet. This patch installs it earlier. It also fixes the problem which exposed the hang, namely that if you give UML a zero-sized initrd, it will ask alloc_bootmem for zero bytes, and that will cause the panic. While I was in initrd.c, I gave it a style makeover. Prompted by checkpatch, I moved a couple extern declarations of uml_exitcode to kern_util.h. Signed-off-by: Jeff Dike <jdike@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
86 lines
1.6 KiB
C
86 lines
1.6 KiB
C
/*
|
|
* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
|
|
* Licensed under the GPL
|
|
*/
|
|
|
|
#include "linux/init.h"
|
|
#include "linux/bootmem.h"
|
|
#include "linux/initrd.h"
|
|
#include "asm/types.h"
|
|
#include "initrd.h"
|
|
#include "init.h"
|
|
#include "os.h"
|
|
|
|
/* Changed by uml_initrd_setup, which is a setup */
|
|
static char *initrd __initdata = NULL;
|
|
|
|
static int __init read_initrd(void)
|
|
{
|
|
void *area;
|
|
long long size;
|
|
int err;
|
|
|
|
if (initrd == NULL)
|
|
return 0;
|
|
|
|
err = os_file_size(initrd, &size);
|
|
if (err)
|
|
return 0;
|
|
|
|
/*
|
|
* This is necessary because alloc_bootmem craps out if you
|
|
* ask for no memory.
|
|
*/
|
|
if (size == 0) {
|
|
printk(KERN_ERR "\"%\" is a zero-size initrd\n");
|
|
return 0;
|
|
}
|
|
|
|
area = alloc_bootmem(size);
|
|
if (area == NULL)
|
|
return 0;
|
|
|
|
if (load_initrd(initrd, area, size) == -1)
|
|
return 0;
|
|
|
|
initrd_start = (unsigned long) area;
|
|
initrd_end = initrd_start + size;
|
|
return 0;
|
|
}
|
|
|
|
__uml_postsetup(read_initrd);
|
|
|
|
static int __init uml_initrd_setup(char *line, int *add)
|
|
{
|
|
initrd = line;
|
|
return 0;
|
|
}
|
|
|
|
__uml_setup("initrd=", uml_initrd_setup,
|
|
"initrd=<initrd image>\n"
|
|
" This is used to boot UML from an initrd image. The argument is the\n"
|
|
" name of the file containing the image.\n\n"
|
|
);
|
|
|
|
int load_initrd(char *filename, void *buf, int size)
|
|
{
|
|
int fd, n;
|
|
|
|
fd = os_open_file(filename, of_read(OPENFLAGS()), 0);
|
|
if (fd < 0) {
|
|
printk(KERN_ERR "Opening '%s' failed - err = %d\n", filename,
|
|
-fd);
|
|
return -1;
|
|
}
|
|
n = os_read_file(fd, buf, size);
|
|
if (n != size) {
|
|
printk(KERN_ERR "Read of %d bytes from '%s' failed, "
|
|
"err = %d\n", size,
|
|
filename, -n);
|
|
return -1;
|
|
}
|
|
|
|
os_close_file(fd);
|
|
return 0;
|
|
}
|