[PATCH] disable kaslr in kdump kernel

[Dave Young <dyoung@redhat.com>]

KASLR does not work in kdump kernel because it's too early that mem=exactmap
has not been parsed.

Since KASLR does not make much sense for kdump kernel thus let's disable it
for kdump kernel. To check if it is a kdump kernel I just check the cmdline
param elfcorehdr just like is_kdump_kernel.

Signed-off-by: Dave Young <dyoung@redhat.com>
---
 linux-2.6/arch/x86/boot/compressed/aslr.c |    5 +++++
 1 file changed, 5 insertions(+)

Index: dyoung/git/linux-2.6/arch/x86/boot/compressed/aslr.c
===================================================================
--- linux-2.6/arch/x86/boot/compressed/aslr.c
+++ linux-2.6/arch/x86/boot/compressed/aslr.c
@@ -293,6 +293,11 @@ unsigned char *choose_kernel_location(un
 		goto out;
 	}
 
+	if (cmdline_find_option("elfcorehdr", NULL, 0) != -1) {
+		debug_putstr("KASLR disabled...\n");
+		goto out;
+	}
+
 	/* Record the various known unsafe memory ranges. */
 	mem_avoid_init((unsigned long)input, input_size,
 		       (unsigned long)output, output_size);