Re: [Patch v3] x86/head/64: remove redundant check on level2_kernel_pgt's _PAGE_PRESENT bit

[Kirill A . Shutemov]

On Thu, May 23, 2024 at 12:35:39PM +0000, Wei Yang wrote:
> Remove a redundant check on kernel code's PMD _PAGE_PRESENT attribute
> before fix up.
> 
> Current process looks like this:
> 
>     pmd in [0, _text)
>         unset _PAGE_PRESENT
>     pmd in [_text, _end]
>         if (_PAGE_PRESENT)
>             fix up delta
>     pmd in (_end, 512)
>         unset _PAGE_PRESENT
> 
> level2_kernel_pgt compiled with _PAGE_PRESENT set. The check is
> redundant
> 
> Signed-off-by: Wei Yang <richard.weiyang@xxxxxxxxx>
> CC: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> CC: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
> CC: Ingo Molnar <mingo@xxxxxxxxxx>
> CC: Steve Wahl <steve.wahl@xxxxxxx>

Acked-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>

-- 
  Kiryl Shutsemau / Kirill A. Shutemov