Re: [regression] Boot crash with: f7426b983a6a ("mm: cma: adjust address limit to avoid hitting low/high memory boundary")
From: Russell King
Date: Tue Dec 09 2014 - 03:51:17 EST
On Tue, Dec 09, 2014 at 04:55:42PM +0900, Joonsoo Kim wrote:
> Could you manage this fix for above boot regression in x86?
> Patch itself is so dirty, because __pa_nodebug() is implemented only
> in x86. If someone knows better idea, please let me know.
> +#ifdef CONFIG_X86
> + /*
> + * high_memory isn't direct mapped memory so retrieving it's
> + * physical address isn't appropriate. But, it would be useful
> + * to check physical address of highmem boundary so it's
> + * justfiable to get physical address from it. In x86, there is
> + * a validation check for this case, so following workaround is
> + * needed to avoid it.
> + */
> + highmem_start = __pa_nodebug(high_memory);
> + highmem_start = __pa(high_memory);
highmem_start = __pa(high_memory - 1) + 1;
As "high_memory - 1" should be a valid lowmem address.
ARM architecture Linux Kernel maintainer
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