[PATCH v6 02/11] uaccess: add untagged_addr definition for other arches

Andrey Konovalov
2018-08-30T11:41:07Z

To allow arm64 syscalls 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 other architectures besides arm64.

Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
---
include/linux/uaccess.h | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/include/linux/uaccess.h b/include/linux/uaccess.h
index efe79c1cdd47..c045b4eff95e 100644
--- a/include/linux/uaccess.h
+++ b/include/linux/uaccess.h
@@ -13,6 +13,10 @@

#include <asm/uaccess.h>

+#ifndef untagged_addr
+#define untagged_addr(addr) addr
+#endif
+
/*
* Architectures should provide two primitives (raw_copy_{to,from}_user())
* and get rid of their private instances of copy_{to,from}_user() and
--
2.19.0.rc0.228.g281dcd1b4d0-goog