[PATCH] powerpc/mm: fix a hardcode on memory boundary checking

[Michael Ellerman]

Rui Teng <rui.teng at linux.vnet.ibm.com> writes:

> The offset of hugepage block will not be 16G, if the expected
> page is more than one. Calculate the totol size instead of the
> hardcode value.

I assume you found this by code inspection and not by triggering an
actual bug?

cheers

> diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
> index 8033493..b829f8e 100644
> --- a/arch/powerpc/mm/hash_utils_64.c
> +++ b/arch/powerpc/mm/hash_utils_64.c
> @@ -506,7 +506,7 @@ static int __init htab_dt_scan_hugepage_blocks(unsigned long node,
>  	printk(KERN_INFO "Huge page(16GB) memory: "
>  			"addr = 0x%lX size = 0x%lX pages = %d\n",
>  			phys_addr, block_size, expected_pages);
> -	if (phys_addr + (16 * GB) <= memblock_end_of_DRAM()) {
> +	if (phys_addr + block_size * expected_pages <= memblock_end_of_DRAM()) {
>  		memblock_reserve(phys_addr, block_size * expected_pages);
>  		add_gpage(phys_addr, block_size, expected_pages);
>  	}
> -- 
> 2.9.0