Re: [v2] powerpc: Force page alignment for initrd
From: Milton Miller <hidden>
Date: 2011-05-21 10:36:30
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lkml
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).
quoted hunk ↗ jump to hunk
@@ -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