[PATCH v2 4/6] percpu: Use TYPEOF_UNQUAL() in *_cpu_ptr() accessors

[Uros Bizjak]

Use TYPEOF_UNQUAL() macro to declare the return type of *_cpu_ptr()
accessors in the generic named address space to avoid access to
data from pointer to non-enclosed address space type of errors.

Signed-off-by: Uros Bizjak <ubizjak@xxxxxxxxx>
Acked-by: Nadav Amit <nadav.amit@xxxxxxxxx>
Cc: Dennis Zhou <dennis@xxxxxxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Brian Gerst <brgerst@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
---
 arch/x86/include/asm/percpu.h | 8 ++++++--
 include/linux/percpu-defs.h   | 2 +-
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h
index 666e4137b09f..27f668660abe 100644
--- a/arch/x86/include/asm/percpu.h
+++ b/arch/x86/include/asm/percpu.h
@@ -73,10 +73,14 @@
 	unsigned long tcp_ptr__ = raw_cpu_read_long(this_cpu_off);	\
 									\
 	tcp_ptr__ += (__force unsigned long)(_ptr);			\
-	(typeof(*(_ptr)) __kernel __force *)tcp_ptr__;			\
+	(TYPEOF_UNQUAL(*(_ptr)) __force __kernel *)tcp_ptr__;		\
 })
 #else
-#define arch_raw_cpu_ptr(_ptr) ({ BUILD_BUG(); (typeof(_ptr))0; })
+#define arch_raw_cpu_ptr(_ptr)						\
+({									\
+	BUILD_BUG();							\
+	(TYPEOF_UNQUAL(*(_ptr)) __force __kernel *)0;			\
+})
 #endif
 
 #define PER_CPU_VAR(var)	%__percpu_seg:(var)__percpu_rel
diff --git a/include/linux/percpu-defs.h b/include/linux/percpu-defs.h
index 266297b21a5d..2921ea97d242 100644
--- a/include/linux/percpu-defs.h
+++ b/include/linux/percpu-defs.h
@@ -223,7 +223,7 @@ do {									\
 #define PERCPU_PTR(__p)							\
 ({									\
 	unsigned long __pcpu_ptr = (__force unsigned long)(__p);	\
-	(typeof(*(__p)) __force __kernel *)(__pcpu_ptr);		\
+	(TYPEOF_UNQUAL(*(__p)) __force __kernel *)(__pcpu_ptr);		\
 })
 
 #ifdef CONFIG_SMP
-- 
2.42.0