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authorHendrik Brueckner <brueckner@linux.vnet.ibm.com>2010-09-17 15:24:11 -0700
committerMichal Marek <mmarek@suse.cz>2010-09-29 16:28:59 +0200
commitffe8018c3424892c9590048fc36caa6c3e0c8a76 (patch)
tree072f02441ee317679a7029be4a1905a610de683e /init/initramfs.c
parent6ae64e428f74e7bacab898ef9665dda719ea6fde (diff)
downloadlinux-linaro-stable-ffe8018c3424892c9590048fc36caa6c3e0c8a76.tar.gz
initramfs: fix initramfs size calculation
The size of a built-in initramfs is calculated in init/initramfs.c by "__initramfs_end - __initramfs_start". Those symbols are defined in the linker script include/asm-generic/vmlinux.lds.h: #define INIT_RAM_FS \ . = ALIGN(PAGE_SIZE); \ VMLINUX_SYMBOL(__initramfs_start) = .; \ *(.init.ramfs) \ VMLINUX_SYMBOL(__initramfs_end) = .; If the initramfs file has an odd number of bytes, the "__initramfs_end" symbol points to an odd address, for example, the symbols in the System.map might look like: 0000000000572000 T __initramfs_start 00000000005bcd05 T __initramfs_end <-- odd address At least on s390 this causes a problem: Certain s390 instructions, especially instructions for loading addresses (larl) or branch addresses must be on even addresses. The compiler loads the symbol addresses with the "larl" instruction. This instruction sets the last bit to 0 and, therefore, for odd size files, the calculated size is one byte less than it should be: 0000000000540a9c <populate_rootfs>: 540a9c: eb cf f0 78 00 24 stmg %r12,%r15,120(%r15), 540aa2: c0 10 00 01 8a af larl %r1,572000 <__initramfs_start> 540aa8: c0 c0 00 03 e1 2e larl %r12,5bcd04 <initramfs_end> (Instead of 5bcd05) ... 540abe: 1b c1 sr %r12,%r1 To fix the problem, this patch introduces the global variable __initramfs_size, which is calculated in the "usr/initramfs_data.S" file. The populate_rootfs() function can then use the start marker of the .init.ramfs section and the value of __initramfs_size for loading the initramfs. Because the start marker and size is sufficient, the __initramfs_end symbol is no longer needed and is removed. Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Reviewed-by: WANG Cong <xiyou.wangcong@gmail.com> Acked-by: Michal Marek <mmarek@suse.cz> Acked-by: "H. Peter Anvin" <hpa@zytor.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Michal Marek <mmarek@suse.cz>
Diffstat (limited to 'init/initramfs.c')
-rw-r--r--init/initramfs.c9
1 files changed, 4 insertions, 5 deletions
diff --git a/init/initramfs.c b/init/initramfs.c
index 4b9c20205092..371c3da64ad3 100644
--- a/init/initramfs.c
+++ b/init/initramfs.c
@@ -483,7 +483,8 @@ static int __init retain_initrd_param(char *str)
}
__setup("retain_initrd", retain_initrd_param);
-extern char __initramfs_start[], __initramfs_end[];
+extern char __initramfs_start[];
+extern unsigned long __initramfs_size;
#include <linux/initrd.h>
#include <linux/kexec.h>
@@ -570,8 +571,7 @@ static void __init clean_rootfs(void)
static int __init populate_rootfs(void)
{
- char *err = unpack_to_rootfs(__initramfs_start,
- __initramfs_end - __initramfs_start);
+ char *err = unpack_to_rootfs(__initramfs_start, __initramfs_size);
if (err)
panic(err); /* Failed to decompress INTERNAL initramfs */
if (initrd_start) {
@@ -585,8 +585,7 @@ static int __init populate_rootfs(void)
return 0;
} else {
clean_rootfs();
- unpack_to_rootfs(__initramfs_start,
- __initramfs_end - __initramfs_start);
+ unpack_to_rootfs(__initramfs_start, __initramfs_size);
}
printk(KERN_INFO "rootfs image is not initramfs (%s)"
"; looks like an initrd\n", err);