On 19/01/26 10:17 PM, Ard Biesheuvel wrote:
> From: Ard Biesheuvel <[email protected]>
>
> The zero page should contain only zero bytes, and so mapping it
> read-write is unnecessary. Move it to __ro_after_init instead.
>
> Signed-off-by: Ard Biesheuvel <[email protected]>
> ---
> arch/arm64/mm/mmu.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
> index 2a18637ecc15..d978b07ab7b8 100644
> --- a/arch/arm64/mm/mmu.c
> +++ b/arch/arm64/mm/mmu.c
> @@ -68,7 +68,8 @@ long __section(".mmuoff.data.write")
> __early_cpu_boot_status;
> * Empty_zero_page is a special page that is used for zero-initialized data
> * and COW.
> */
> -unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
> __page_aligned_bss;
> +unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
> + __ro_after_init __aligned(PAGE_SIZE);
> EXPORT_SYMBOL(empty_zero_page);
>
> static DEFINE_SPINLOCK(swapper_pgdir_lock);
A small nit - could this be the first patch in the series here ? Becasue it is
not related to other three patches.
Reviewed-by: Anshuman Khandual <[email protected]>
