linux-kernel - [PATCH 11/12] x86_64: do not reserve ramdisk two times

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Date:	Wed, 19 Mar 2008 14:04:56 -0700
From:	Yinghai Lu <yhlu.kernel.send@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>
Cc:	Christoph Lameter <clameter@....com>,
	kernel list <linux-kernel@...r.kernel.org>
Subject: [PATCH 11/12] x86_64: do not reserve ramdisk two times

[PATCH] 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: Yinghai Lu <yhlu.kernel@...il.com>

Index: linux-2.6/arch/x86/kernel/head64.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/head64.c
+++ linux-2.6/arch/x86/kernel/head64.c
@@ -110,6 +110,7 @@ void __init x86_64_start_kernel(char * r
 
 	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;
@@ -117,6 +118,7 @@ void __init x86_64_start_kernel(char * r
 		unsigned long ramdisk_end   = ramdisk_image + ramdisk_size;
 		reserve_early(ramdisk_image, ramdisk_end, "RAMDISK");
 	}
+#endif
 
 	reserve_ebda();
 
Index: linux-2.6/arch/x86/kernel/setup_64.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/setup_64.c
+++ linux-2.6/arch/x86/kernel/setup_64.c
@@ -421,11 +421,14 @@ 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",
--
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