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[v7,1/8] arm64: add type casts to untagged_addr macro

Message ID 6a951a9d1cd38eac1e49591f70e3cb9410349823.1538485901.git.andreyknvl@google.com (mailing list archive)
State New
Headers show
Series arm64: untag user pointers passed to the kernel | expand

Commit Message

Andrey Konovalov Oct. 2, 2018, 1:12 p.m. UTC 
This patch makes the untagged_addr macro accept all kinds of address types
(void *, unsigned long, etc.) and allows not to specify type casts in each
place where it is used. This is done by using __typeof__.

Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
---
 arch/arm64/include/asm/uaccess.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
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Patch

diff --git a/arch/arm64/include/asm/uaccess.h b/arch/arm64/include/asm/uaccess.h
index e66b0fca99c2..2d6451cbaa86 100644
--- a/arch/arm64/include/asm/uaccess.h
+++ b/arch/arm64/include/asm/uaccess.h
@@ -102,7 +102,8 @@  static inline unsigned long __range_ok(const void __user *addr, unsigned long si
  * up with a tagged userland pointer. Clear the tag to get a sane pointer to
  * pass on to access_ok(), for instance.
  */
-#define untagged_addr(addr)		sign_extend64(addr, 55)
+#define untagged_addr(addr)		\
+	((__typeof__(addr))sign_extend64((__u64)(addr), 55))
 
 #define access_ok(type, addr, size)	__range_ok(addr, size)
 #define user_addr_max			get_fs