Re: [PATCH v4 4/4] x86/mm/KASLR: Adjust the padding size for the direct mapping.

[Baoquan He <bhe@redhat.com>]

On 11/12/19 at 03:47pm, Masayoshi Mizuma wrote:
> Your suggesion makes it simpler, thanks!
> So I'll modify calc_direct_mapping_size() as following.
> Does it make sense?

Yeah, it looks good to me. Thanks.

> 
> static inline unsigned long calc_direct_mapping_size(void)
> {
>        unsigned long size_tb, memory_tb;
> 
>        memory_tb = DIV_ROUND_UP(max_pfn << PAGE_SHIFT, 1UL << TB_SHIFT) +
>                CONFIG_RANDOMIZE_MEMORY_PHYSICAL_PADDING;
> 
> #ifdef CONFIG_MEMORY_HOTPLUG
>        if (boot_params.max_addr) {
>                unsigned long maximum_tb;
> 
>                maximum_tb = DIV_ROUND_UP(boot_params.max_addr,
>                                1UL << TB_SHIFT);
> 
>                if (maximum_tb > memory_tb)
>                        memory_tb = maximum_tb;
>        }
> #endif
>        size_tb = 1 << (MAX_PHYSMEM_BITS - TB_SHIFT);
> 
>        /*
>         * Adapt physical memory region size based on available memory
>         */
>        if (memory_tb < size_tb)
>                size_tb = memory_tb;
> 
>        return size_tb;
> }