Re: [PATCH v5 RESEND 06/17] mm/ioremap: add slab availability checking in ioremap_prot

[Christoph Hellwig]

On Mon, May 15, 2023 at 05:08:37PM +0800, Baoquan He wrote:
> Several architectures has done checking if slab if available in
> ioremap_prot(). In fact it should be done in generic ioremap_prot()
> since on any architecutre, slab allocator must be available before
> get_vm_area_caller() and vunmap() are used.
> 
> Add the checking into generic_ioremap_prot().

Should we add a WARN_ON/WARN_ON_ONCE to aid debugging?

Otherwise looks good:

Reviewed-by: Christoph Hellwig <hch@xxxxxx>