[PATCH] arm64: mm: ignore memory above supported physical address size
Catalin Marinas
catalin.marinas at arm.com
Fri Jan 19 05:09:21 PST 2018
On Thu, Jan 18, 2018 at 07:13:11PM +0000, Kristina Martsenko wrote:
> When booting a kernel without 52-bit PA support (e.g. a kernel with 4k
> pages) on a system with 52-bit memory, the kernel will currently try to
> use the 52-bit memory and crash. Fix this by ignoring any memory higher
> than what the kernel supports.
>
> Fixes: f77d281713d4 ("arm64: enable 52-bit physical address support")
> Signed-off-by: Kristina Martsenko <kristina.martsenko at arm.com>
> ---
> arch/arm64/mm/init.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
> index 672094ed7e07..285745b2ca38 100644
> --- a/arch/arm64/mm/init.c
> +++ b/arch/arm64/mm/init.c
> @@ -366,6 +366,9 @@ void __init arm64_memblock_init(void)
> /* Handle linux,usable-memory-range property */
> fdt_enforce_memory_region();
>
> + /* Remove memory above our supported physical address size */
> + memblock_remove(1ULL << PHYS_MASK_SHIFT, ULLONG_MAX);
> +
> /*
> * Ensure that the linear region takes up exactly half of the kernel
> * virtual address space. This way, we can distinguish a linear address
It looks fine. I'll queue it for 4.16.
Thanks.
--
Catalin
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