Re: [PATCH] mm/folio: EXPORT_SYMBOL_FOR_KVM(lru_cache_drain_for_folio)

[Sean Christopherson <seanjc@google.com>]

On Tue, Sep 01, 2026, Hugh Dickins wrote:
> From: Ackerley Tng <ackerleytng@google.com>
> 
> To simplify independent development in the KVM and MM subsystems, now
> export to KVM the lru_cache_drain_for_folio() which MM added in 7.3-rc1.
> 
> Link: https://lore.kernel.org/lkml/bd6c9c74-e374-a9d3-ba1f-8b6f430894fc@google.com/T/#u
> Acked-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>
> Suggested-by: David Hildenbrand <david@kernel.org>
> Reviewed-by: Fuad Tabba <fuad.tabba@linux.dev>
> Reviewed-by: Binbin Wu <binbin.wu@linux.intel.com>
> Signed-off-by: Ackerley Tng <ackerleytng@google.com>
> Signed-off-by: Hugh Dickins <hughd@google.com>
> ---
> Hoping for 7.3-rc2, which would make my life easier: thanks!

FWIW, squeezing this into rc2 would make my life (marginally) easier as well, as
this is the only non-KVM change in Ackerley's guest_memfd series.

>  mm/folio.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/mm/folio.c b/mm/folio.c
> index c02dcea9c03c..50a6dbe55998 100644
> --- a/mm/folio.c
> +++ b/mm/folio.c
> @@ -33,6 +33,7 @@
>  #include <linux/page_idle.h>
>  #include <linux/local_lock.h>
>  #include <linux/buffer_head.h>
> +#include <linux/kvm_types.h>
>  
>  #include "internal.h"
>  #include "page_alloc.h"
> @@ -926,6 +927,7 @@ void lru_cache_drain_for_folio(const struct folio *folio,
>  			*drained = LRU_CACHE_DRAINED_ALL;
>  	}
>  }
> +EXPORT_SYMBOL_FOR_KVM(lru_cache_drain_for_folio);
>  
>  atomic_t lru_disable_count = ATOMIC_INIT(0);
>  
> -- 
> base-commiti: cee9395acd8043be0644b25c34bfa86623f2b935