Re: [PATCH v6 10/16] mm: replace vm_lock and detached flag with a reference count

[Peter Zijlstra]

On Mon, Dec 16, 2024 at 11:24:13AM -0800, Suren Baghdasaryan wrote:
> @@ -734,10 +761,12 @@ static inline bool vma_start_read(struct vm_area_struct *vma)
>  	 * after it has been unlocked.
>  	 * This pairs with RELEASE semantics in vma_end_write_all().
>  	 */
> +	if (oldcnt & VMA_STATE_LOCKED ||
> +	    unlikely(vma->vm_lock_seq == raw_read_seqcount(&vma->vm_mm->mm_lock_seq))) {

You likely want that unlikely to cover both conditions :-)

> +		vma_refcount_put(vma);
>  		return false;
>  	}
> +
>  	return true;
>  }