Re: [PATCH 07/32] mm: Bring back vmalloc_exec

[Mike Rapoport]

On Wed, May 17, 2023 at 10:18:11AM -0400, Kent Overstreet wrote:
> On Wed, May 17, 2023 at 05:04:27PM +0300, Mike Rapoport wrote:
> 
> And I'm really curious why text_poke() is needed at all. Seems like we
> could just use kmap_local() to create a temporary writeable mapping,

On 64 bit kmap_local_page() is aliased to page_address() and does not map
anything. text_poke() is needed to actually create a temporary writable
mapping without touching page tables in vmalloc and/or direct map.

-- 
Sincerely yours,
Mike.