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[v2,2/6] uaccess: add untagged_addr definition for other arches

Message ID f63094e20c1eb163ba3ae6f3531e791d2675a2a5.1525356769.git.andreyknvl@google.com
State New, archived
Headers show

Commit Message

Andrey Konovalov May 3, 2018, 2:15 p.m. UTC
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 (like the mm subsystem), the untagged_addr
macro should 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(+)
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Patch

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