[patch 17/30] x86: handle initrd that extends into unusable memory

From: Greg KH
Date: Tue Jun 30 2009 - 20:34:51 EST


2.6.27-stable review patch. If anyone has any objections, please let us know.

------------------

From: Yinghai Lu <yinghai@xxxxxxxxxx>

commit 8c5dd8f43367f4f266dd616f11658005bc2d20ef upstream.

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@xxxxxxxxxx>
Signed-off-by: H. Peter Anvin <hpa@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
arch/x86/kernel/setup.c | 15 +++------------
1 file changed, 3 insertions(+), 12 deletions(-)

--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -250,15 +250,13 @@ static inline void copy_edd(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;
@@ -314,14 +312,13 @@ 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)
@@ -351,14 +348,8 @@ 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


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/