lkml.org 
[lkml]   [2011]   [May]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
SubjectRe: [v2] powerpc: Force page alignment for initrd
From
Date
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)
> #ifdef CONFIG_BLK_DEV_INITRD
> /* 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.

Thanks,
milton


\
 
 \ /
  Last update: 2011-05-21 12:39    [W:0.040 / U:2.764 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site