Re: [RFC PATCH 02/14] userfaultfd: try to map write-unprotected pages

[Peter Xu]

On Mon, Jul 18, 2022 at 05:02:00AM -0700, Nadav Amit wrote:
> From: Nadav Amit <namit@xxxxxxxxxx>
> 
> When using userfaultfd write-(un)protect ioctl, try to change the PTE to
> be writable. This would save a page-fault afterwards.
> 
> Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
> Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> Cc: Andy Lutomirski <luto@xxxxxxxxxx>
> Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
> Cc: David Hildenbrand <david@xxxxxxxxxx>
> Cc: Peter Xu <peterx@xxxxxxxxxx>
> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> Cc: Will Deacon <will@xxxxxxxxxx>
> Cc: Yu Zhao <yuzhao@xxxxxxxxxx>
> Cc: Nick Piggin <npiggin@xxxxxxxxx>
> Signed-off-by: Nadav Amit <namit@xxxxxxxxxx>

Acked-by: Peter Xu <peterx@xxxxxxxxxx>

-- 
Peter Xu