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-rw-r--r--arch/mips/Kconfig9
-rw-r--r--arch/mips/kernel/setup.c33
2 files changed, 27 insertions, 15 deletions
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 4da736e2533..49896a2a1d7 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -1886,6 +1886,15 @@ config STACKTRACE_SUPPORT
source "init/Kconfig"
+config PROBE_INITRD_HEADER
+ bool "Probe initrd header created by addinitrd"
+ depends on BLK_DEV_INITRD
+ help
+ Probe initrd header at the last page of kernel image.
+ Say Y here if you are using arch/mips/boot/addinitrd.c to
+ add initrd or initramfs image to the kernel image.
+ Otherwise, say N.
+
menu "Bus options (PCI, PCMCIA, EISA, ISA, TC)"
config HW_HAS_EISA
diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index 2aae76bce29..16f8edfe5cd 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -160,30 +160,33 @@ early_param("rd_size", rd_size_early);
static unsigned long __init init_initrd(void)
{
unsigned long end;
- u32 *initrd_header;
/*
* Board specific code or command line parser should have
* already set up initrd_start and initrd_end. In these cases
* perfom sanity checks and use them if all looks good.
*/
- if (initrd_start && initrd_end > initrd_start)
- goto sanitize;
+ if (!initrd_start || initrd_end <= initrd_start) {
+#ifdef CONFIG_PROBE_INITRD_HEADER
+ u32 *initrd_header;
- /*
- * See if initrd has been added to the kernel image by
- * arch/mips/boot/addinitrd.c. In that case a header is
- * prepended to initrd and is made up by 8 bytes. The fisrt
- * word is a magic number and the second one is the size of
- * initrd. Initrd start must be page aligned in any cases.
- */
- initrd_header = __va(PAGE_ALIGN(__pa_symbol(&_end) + 8)) - 8;
- if (initrd_header[0] != 0x494E5244)
+ /*
+ * See if initrd has been added to the kernel image by
+ * arch/mips/boot/addinitrd.c. In that case a header is
+ * prepended to initrd and is made up by 8 bytes. The first
+ * word is a magic number and the second one is the size of
+ * initrd. Initrd start must be page aligned in any cases.
+ */
+ initrd_header = __va(PAGE_ALIGN(__pa_symbol(&_end) + 8)) - 8;
+ if (initrd_header[0] != 0x494E5244)
+ goto disable;
+ initrd_start = (unsigned long)(initrd_header + 2);
+ initrd_end = initrd_start + initrd_header[1];
+#else
goto disable;
- initrd_start = (unsigned long)(initrd_header + 2);
- initrd_end = initrd_start + initrd_header[1];
+#endif
+ }
-sanitize:
if (initrd_start & ~PAGE_MASK) {
pr_err("initrd start must be page aligned\n");
goto disable;