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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: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Cc: stable@kernel.org
This commit is contained in:
Yinghai Lu 2009-06-04 19:14:22 -07:00 committed by H. Peter Anvin
parent 512626a04e
commit 8c5dd8f433
1 changed files with 3 additions and 12 deletions
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15
arch/x86/kernel/setup.c
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@ -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