To allow arm64 syscalls to accept tagged pointers from userspace, we must untag them when they are passed to the kernel. Since untagging is done in generic parts of the kernel, the untagged_addr macro needs to be defined for all architectures.
Define it as a noop for architectures other than arm64.
Acked-by: Catalin Marinas catalin.marinas@arm.com Signed-off-by: Andrey Konovalov andreyknvl@google.com --- include/linux/memory.h | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/include/linux/memory.h b/include/linux/memory.h index a6ddefc60517..fc383bc39ab8 100644 --- a/include/linux/memory.h +++ b/include/linux/memory.h @@ -21,6 +21,10 @@ #include <linux/mutex.h> #include <linux/notifier.h>
+#ifndef untagged_addr +#define untagged_addr(addr) (addr) +#endif + #define MIN_MEMORY_BLOCK_SIZE (1UL << SECTION_SIZE_BITS)
struct memory_block {