Subject: Re: [PATCH 2/2] powerpc: export memory encryption helper functions

From: "Christophe Leroy (CS GROUP)" <[email-masked]>
Date: Tue, 26 May 2026 13:53:50 +0200

Hi Arnd,

Le 26/05/2026 à 12:20, Arnd Bergmann a écrit :
> From: Arnd Bergmann <[email-masked]>
> 
> The set_memory_encrypted/set_memory_decrypted functions are exported
> on x86 and arm64 but not on powerpc, 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.

The same fix was rejected already, see 
https://lore.kernel.org/all/[email-masked]/

Christophe

> 
> Fixes: fd55edff8a0a ("dma-buf: heaps: system: Turn the heap into a module")
> Signed-off-by: Arnd Bergmann <[email-masked]>
> ---
>   arch/powerpc/platforms/pseries/svm.c | 3 +++
>   1 file changed, 3 insertions(+)
> 
> diff --git a/arch/powerpc/platforms/pseries/svm.c b/arch/powerpc/platforms/pseries/svm.c
> index 384c9dc1899a..ab8f8c722741 100644
> --- a/arch/powerpc/platforms/pseries/svm.c
> +++ b/arch/powerpc/platforms/pseries/svm.c
> @@ -6,6 +6,7 @@
>    * Author: Anshuman Khandual <[email-masked]>
>    */
>   
> +#include <linux/export.h>
>   #include <linux/mm.h>
>   #include <linux/memblock.h>
>   #include <linux/mem_encrypt.h>
> @@ -50,6 +51,7 @@ int set_memory_encrypted(unsigned long addr, int numpages)
>   
>   	return 0;
>   }
> +EXPORT_SYMBOL_GPL(set_memory_encrypted);
>   
>   int set_memory_decrypted(unsigned long addr, int numpages)
>   {
> @@ -63,6 +65,7 @@ int set_memory_decrypted(unsigned long addr, int numpages)
>   
>   	return 0;
>   }
> +EXPORT_SYMBOL_GPL(set_memory_decrypted);
>   
>   /* There's one dispatch log per CPU. */
>   #define NR_DTL_PAGE (DISPATCH_LOG_BYTES * CONFIG_NR_CPUS / PAGE_SIZE)