Commit 8c5dd8f4 authored by Yinghai Lu's avatar Yinghai Lu Committed by H. Peter Anvin
Browse files

x86: handle initrd that extends into unusable memory 



On a system where system memory (according e820) is not covered by
mtrr, mtrr_trim_memory converts a portion of memory to reserved, but
bootloader has already put the initrd in that range.

Thus, we need to have 64bit to use relocate_initrd too.

[ Impact: fix using initrd when mtrr_trim_memory happen ]

Signed-off-by: default avatarYinghai Lu <yinghai@kernel.org>
Signed-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
Cc: stable@kernel.org
parent 512626a0

arch/x86/kernel/setup.c

+3 −12
Original line number Diff line number Diff line
@@ -301,15 +301,13 @@ static void __init reserve_brk(void) 


#ifdef CONFIG_BLK_DEV_INITRD



#ifdef CONFIG_X86_32



#define MAX_MAP_CHUNK	(NR_FIX_BTMAPS << PAGE_SHIFT)

static void __init relocate_initrd(void)

{



	u64 ramdisk_image = boot_params.hdr.ramdisk_image;

	u64 ramdisk_size  = boot_params.hdr.ramdisk_size;

	u64 end_of_lowmem = max_low_pfn << PAGE_SHIFT;

	u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT;

	u64 ramdisk_here;

	unsigned long slop, clen, mapaddr;

	char *p, *q;
@@ -365,14 +363,13 @@ static void __init relocate_initrd(void) 
		ramdisk_image, ramdisk_image + ramdisk_size - 1,

		ramdisk_here, ramdisk_here + ramdisk_size - 1);

}

#endif



static void __init reserve_initrd(void)

{

	u64 ramdisk_image = boot_params.hdr.ramdisk_image;

	u64 ramdisk_size  = boot_params.hdr.ramdisk_size;

	u64 ramdisk_end   = ramdisk_image + ramdisk_size;

	u64 end_of_lowmem = max_low_pfn << PAGE_SHIFT;

	u64 end_of_lowmem = max_low_pfn_mapped << PAGE_SHIFT;



	if (!boot_params.hdr.type_of_loader ||

	    !ramdisk_image || !ramdisk_size)
@@ -402,14 +399,8 @@ static void __init reserve_initrd(void) 
		return;

	}



#ifdef CONFIG_X86_32

	relocate_initrd();

#else

	printk(KERN_ERR "initrd extends beyond end of memory "

	       "(0x%08llx > 0x%08llx)\ndisabling initrd\n",

	       ramdisk_end, end_of_lowmem);

	initrd_start = 0;

#endif



	free_early(ramdisk_image, ramdisk_end);

}

#else

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