[PATCH 20/21] erofs: kill use_vmap module parameter

[Christoph Hellwig]

> @@ -224,9 +220,6 @@ static void *erofs_vmap(struct page **pages, unsigned int count)
>  {
>  	int i = 0;
>  
> -	if (use_vmap)
> -		return vmap(pages, count, VM_MAP, PAGE_KERNEL);
> -
>  	while (1) {
>  		void *addr = vm_map_ram(pages, count, -1, PAGE_KERNEL);

I think you can just open code this in the caller.

>  static void erofs_vunmap(const void *mem, unsigned int count)
>  {
> -	if (!use_vmap)
> -		vm_unmap_ram(mem, count);
> -	else
> -		vunmap(mem);
> +	vm_unmap_ram(mem, count);
>  }

And this wrapper can go away entirely.

And don't forget to report your performance observations to the arm64
maintainers!