arm64: move untagged_addr macro from uaccess.h to memory.h

Move the untagged_addr() macro from arch/arm64/include/asm/uaccess.h
to arch/arm64/include/asm/memory.h to be later reused by KASAN.

Also make the untagged_addr() macro accept all kinds of address types
(void *, unsigned long, etc.). This allows not to specify type casts in
each place where the macro is used. This is done by using __typeof__.

Link: http://lkml.kernel.org/r/432ef6686a25b49244f54c4dfd86bc4b20381d8a.1543337629.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>

diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h
index 05fbc7ffcd31b93fa48fb25ba73b3a76a2097f8b..e2c9857157f2df9de27650f99904dba9dca28fb7 100644 (file)
--- a/arch/arm64/include/asm/memory.h
+++ b/arch/arm64/include/asm/memory.h
@@ -211,6 +211,14 @@ static inline unsigned long kaslr_offset(void)
  */
 #define PHYS_PFN_OFFSET        (PHYS_OFFSET >> PAGE_SHIFT)
 
+/*
+ * When dealing with data aborts, watchpoints, or instruction traps we may end
+ * 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)    \
+       ((__typeof__(addr))sign_extend64((u64)(addr), 55))
+
 /*
  * Physical vs virtual RAM address space conversion.  These are
  * private definitions which should NOT be used outside memory.h

diff --git a/arch/arm64/include/asm/uaccess.h b/arch/arm64/include/asm/uaccess.h
index 07c34087bd5e8c09ad0f09d51b63d8ed04ca947d..281a1e47263d2da18fff237f3d1b7b40a99fd6fa 100644 (file)
--- a/arch/arm64/include/asm/uaccess.h
+++ b/arch/arm64/include/asm/uaccess.h
@@ -96,13 +96,6 @@ static inline unsigned long __range_ok(const void __user *addr, unsigned long si
        return ret;
 }
 
-/*
- * When dealing with data aborts, watchpoints, or instruction traps we may end
- * 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 access_ok(type, addr, size)    __range_ok(addr, size)
 #define user_addr_max                  get_fs