Re: [v2] powerpc: Force page alignment for initrd

From: Milton Miller
Date: Sat May 21 2011 - 06:36:33 EST

On Fri, 20 May 2011 about 13:23:36 -0000, Dave Carroll wrote:
> When using 64K pages with a separate cpio rootfs, U-Boot will align
> the rootfs on a 4K page boundary. When the memory is reserved, and
> subsequent early memblock_alloc is called, it will allocate memory
> between the 64K page alignment and reserved memory. When the reserved
> memory is subsequently freed, it is done so by pages, causing the
> early memblock_alloc requests to be re-used, which in my case, caused
> the device-tree to be clobbered.
> This patch forces initrd to be kernel page aligned, to match the
> mechanism used to free reserved memory.

Actually it is only forcing the memory reserved for the initrd (its
not moving the contents nor filling the extra space).

> @@ -555,7 +555,8 @@ static void __init early_reserve_mem(void)
> /* then reserve the initrd, if any */
> if (initrd_start && (initrd_end > initrd_start))
> - memblock_reserve(__pa(initrd_start), initrd_end - initrd_start);
> + memblock_reserve(_ALIGN_DOWN(__pa(initrd_start), PAGE_SIZE),
> + PAGE_ALIGN(initrd_end) - _ALIGN_DOWN(initrd_start, PAGE_SIZE));

Please align up the end, then change free_initrd_mem (32 and 64 bit)
to do the same range extension.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at