sh: add dynamic crash base address support

Add support for dynamic crash kernel base address.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 9 insertions, 6 deletions

diff --git a/arch/sh/kernel/setup.c b/arch/sh/kernel/setup.c
index 5767f0a84cd7..e7152cc6930e 100644
--- a/arch/sh/kernel/setup.c
+++ b/arch/sh/kernel/setup.c
@@ -147,6 +147,7 @@ static void __init reserve_crashkernel(void)
 {
         unsigned long long free_mem;
         unsigned long long crash_size, crash_base;
+        void *vp;
         int ret;
 
         free_mem = ((unsigned long long)max_low_pfn - min_low_pfn) << PAGE_SHIFT;
@@ -155,12 +156,14 @@ static void __init reserve_crashkernel(void)
                         &crash_size, &crash_base);
         if (ret == 0 && crash_size) {
                 if (crash_base <= 0) {
-                        printk(KERN_INFO "crashkernel reservation failed - "
-                                        "you have to specify a base address\n");
-                        return;
-                }
-
-                if (reserve_bootmem(crash_base, crash_size,
+                        vp = alloc_bootmem_nopanic(crash_size); 
+                        if (!vp) {
+                                printk(KERN_INFO "crashkernel allocation "
+                                       "failed\n");
+                                return;
+                        }
+                        crash_base = __pa(vp);
+                } else if (reserve_bootmem(crash_base, crash_size,
                                         BOOTMEM_EXCLUSIVE) < 0) {
                         printk(KERN_INFO "crashkernel reservation failed - "
                                         "memory is in use\n");