Re: [PATCH v2 2/2] ARM: mm: convert empty_zero_page to array for consistency

[Russell King (Oracle)]

On Wed, Oct 19, 2022 at 12:25:03AM +0200, Giulio Benetti wrote:
> ARM architecture is the only one to have empty_zero_page to be a
> struct page pointer, while in all other implementations empty_zero_page is
> a data pointer or directly an array(the zero page itself). So let's convert
> empty_zero_page to an array for consistency and to avoid an early
> allocation+dcache flush. Being the array in .bss it will be cleared earlier
> in a more linear way(and a bit faster) way.
> 
> Suggested-by: Arnd Bergmann <arnd@xxxxxxxx>
> Signed-off-by: Giulio Benetti <giulio.benetti@xxxxxxxxxxxxxxxxxxxxxx>

I'm completely against this approach. It introduces inefficiencies in
paths we don't need, and also means that the zero page is at a fixed
location relative to the kernel, neither of which I like in the
slightest.

Thanks.

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