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-rw-r--r--arch/powerpc/kernel/machine_kexec.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/machine_kexec.c b/arch/powerpc/kernel/machine_kexec.c
index b3abebb7ee6..d59e2b1bdcb 100644
--- a/arch/powerpc/kernel/machine_kexec.c
+++ b/arch/powerpc/kernel/machine_kexec.c
@@ -93,10 +93,35 @@ void __init reserve_crashkernel(void)
KDUMP_KERNELBASE);
crashk_res.start = KDUMP_KERNELBASE;
+#else
+ if (!crashk_res.start) {
+ /*
+ * unspecified address, choose a region of specified size
+ * can overlap with initrd (ignoring corruption when retained)
+ * ppc64 requires kernel and some stacks to be in first segemnt
+ */
+ crashk_res.start = KDUMP_KERNELBASE;
+ }
+
+ crash_base = PAGE_ALIGN(crashk_res.start);
+ if (crash_base != crashk_res.start) {
+ printk("Crash kernel base must be aligned to 0x%lx\n",
+ PAGE_SIZE);
+ crashk_res.start = crash_base;
+ }
+
#endif
crash_size = PAGE_ALIGN(crash_size);
crashk_res.end = crashk_res.start + crash_size - 1;
+ /* The crash region must not overlap the current kernel */
+ if (overlaps_crashkernel(__pa(_stext), _end - _stext)) {
+ printk(KERN_WARNING
+ "Crash kernel can not overlap current kernel\n");
+ crashk_res.start = crashk_res.end = 0;
+ return;
+ }
+
/* Crash kernel trumps memory limit */
if (memory_limit && memory_limit <= crashk_res.end) {
memory_limit = crashk_res.end + 1;