Re: [PATCH 1/2] s390: export memory encryption helper functions

[Claudio Imbrenda]

On Tue, 26 May 2026 12:20:37 +0200
Arnd Bergmann <arnd@xxxxxxxxxx> wrote:

> From: Arnd Bergmann <arnd@xxxxxxxx>
> 
> The set_memory_encrypted/set_memory_decrypted functions are exported
> on x86 and arm64 but not on s390, which leads to a new build failure
> because they are now used in a loadable module:
> 
> ERROR: modpost: "set_memory_encrypted" [drivers/dma-buf/heaps/system_heap.ko] undefined!
> ERROR: modpost: "set_memory_decrypted" [drivers/dma-buf/heaps/system_heap.ko] undefined!
> 
> Export these the same way we do on the other architectures.
> 
> Fixes: fd55edff8a0a ("dma-buf: heaps: system: Turn the heap into a module")
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>

Reviewed-by: Claudio Imbrenda <imbrenda@xxxxxxxxxxxxx>

> ---
>  arch/s390/mm/init.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
> index f07168a0d3dd..d589c5e4d388 100644
> --- a/arch/s390/mm/init.c
> +++ b/arch/s390/mm/init.c
> @@ -124,6 +124,7 @@ int set_memory_encrypted(unsigned long vaddr, int numpages)
>  	}
>  	return 0;
>  }
> +EXPORT_SYMBOL_GPL(set_memory_encrypted);
>  
>  int set_memory_decrypted(unsigned long vaddr, int numpages)
>  {
> @@ -135,6 +136,7 @@ int set_memory_decrypted(unsigned long vaddr, int numpages)
>  	}
>  	return 0;
>  }
> +EXPORT_SYMBOL_GPL(set_memory_decrypted);
>  
>  /* are we a protected virtualization guest? */
>  bool force_dma_unencrypted(struct device *dev)