x86_64: do not reserve ramdisk two times

ramdisk is reserved via reserve_early in x86_64_start_kernel,
later early_res_to_bootmem() will convert to reservation in bootmem.

so don't need to reserve that again.
Signed-off-by: NYinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

arch/x86/kernel/head64.c

@@ -146,6 +146,7 @@ void __init x86_64_start_kernel(char * real_mode_data)
 
 	reserve_early(__pa_symbol(&_text), __pa_symbol(&_end), "TEXT DATA BSS");
 
+#ifdef CONFIG_BLK_DEV_INITRD
 	/* Reserve INITRD */
 	if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) {
 		unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
@@ -153,6 +154,7 @@ void __init x86_64_start_kernel(char * real_mode_data)
 		unsigned long ramdisk_end   = ramdisk_image + ramdisk_size;
 		reserve_early(ramdisk_image, ramdisk_end, "RAMDISK");
 	}
+#endif
 
 	reserve_ebda_region();
 

arch/x86/kernel/setup_64.c

@@ -420,11 +420,14 @@ void __init setup_arch(char **cmdline_p)
 		unsigned long end_of_mem    = end_pfn << PAGE_SHIFT;
 
 		if (ramdisk_end <= end_of_mem) {
-			reserve_bootmem_generic(ramdisk_image, ramdisk_size);
+			/*
+			 * don't need to reserve again, already reserved early
+			 * in x86_64_start_kernel, and early_res_to_bootmem
+			 * convert that to reserved in bootmem
+			 */
 			initrd_start = ramdisk_image + PAGE_OFFSET;
 			initrd_end = initrd_start+ramdisk_size;
 		} else {
-			/* Assumes everything on node 0 */
 			free_bootmem(ramdisk_image, ramdisk_size);
 			printk(KERN_ERR "initrd extends beyond end of memory "
 			       "(0x%08lx > 0x%08lx)\ndisabling initrd\n",