* [PATCH 2/2] powerpc: export memory encryption helper functions
[not found] <20260526102113.2594501-1-arnd@kernel.org>
@ 2026-05-26 10:20 ` Arnd Bergmann
2026-05-26 11:53 ` Christophe Leroy (CS GROUP)
0 siblings, 1 reply; 2+ messages in thread
From: Arnd Bergmann @ 2026-05-26 10:20 UTC (permalink / raw)
To: Madhavan Srinivasan, Michael Ellerman, T.J. Mercier,
Maxime Ripard, Sumit Semwal, Andrew Davis
Cc: Arnd Bergmann, Nicholas Piggin, Christophe Leroy (CS GROUP),
linuxppc-dev, linux-kernel
From: Arnd Bergmann <arnd@arndb•de>
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.
Fixes: fd55edff8a0a ("dma-buf: heaps: system: Turn the heap into a module")
Signed-off-by: Arnd Bergmann <arnd@arndb•de>
---
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 <khandual@linux•vnet.ibm.com>
*/
+#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)
--
2.39.5
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH 2/2] powerpc: export memory encryption helper functions
2026-05-26 10:20 ` [PATCH 2/2] powerpc: export memory encryption helper functions Arnd Bergmann
@ 2026-05-26 11:53 ` Christophe Leroy (CS GROUP)
0 siblings, 0 replies; 2+ messages in thread
From: Christophe Leroy (CS GROUP) @ 2026-05-26 11:53 UTC (permalink / raw)
To: Arnd Bergmann, Madhavan Srinivasan, Michael Ellerman,
T.J. Mercier, Maxime Ripard, Sumit Semwal, Andrew Davis,
Christoph Hellwig
Cc: Arnd Bergmann, Nicholas Piggin, linuxppc-dev, linux-kernel
Hi Arnd,
Le 26/05/2026 à 12:20, Arnd Bergmann a écrit :
> From: Arnd Bergmann <arnd@arndb•de>
>
> 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/ahPqbfH54R3JJyaV@infradead.org/
Christophe
>
> Fixes: fd55edff8a0a ("dma-buf: heaps: system: Turn the heap into a module")
> Signed-off-by: Arnd Bergmann <arnd@arndb•de>
> ---
> 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 <khandual@linux•vnet.ibm.com>
> */
>
> +#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)
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2026-05-26 10:20 ` [PATCH 2/2] powerpc: export memory encryption helper functions Arnd Bergmann
2026-05-26 11:53 ` Christophe Leroy (CS GROUP)
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