From mboxrd@z Thu Jan  1 00:00:00 1970
From: andreyknvl@google.com (Andrey Konovalov)
Date: Wed, 20 Jun 2018 17:24:21 +0200
Subject: [PATCH v4 2/7] uaccess: add untagged_addr definition for other arches
In-Reply-To: <cover.1529507994.git.andreyknvl@google.com>
References: <cover.1529507994.git.andreyknvl@google.com>
Message-ID:
 <a937551f03c4617aa400fb75130627df7ed09506.1529507994.git.andreyknvl@google.com>
Content-Type: text/plain; charset="UTF-8"
Message-ID: <20180620152421.lTV6kerxbg0fXnLTMaayhBWwSWpw1S8OxNoa-kx14lk@z>

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 at 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
-- 
2.18.0.rc1.244.gcf134e6275-goog

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