Re: [PATCH v2] mm/memory.c: do_fault: avoid usage of stale vm_area_struct

[Andrea Arcangeli]

Hello Jan,

On Sat, Mar 02, 2019 at 07:19:39PM +0100, Jan Stancek wrote:
> +	struct mm_struct *vm_mm = READ_ONCE(vma->vm_mm);

The vma->vm_mm cannot change under gcc there, so no need of
READ_ONCE. The release of mmap_sem has release semantics so the
vma->vm_mm access cannot be reordered after up_read(mmap_sem) either.

Other than the above detail:

Reviewed-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>

Thanks,
Andrea