percpu: make accessors check for percpu pointer in sparse

[karo-tx-linux.git] / include / asm-generic / percpu.h

diff --git a/include/asm-generic/percpu.h b/include/asm-generic/percpu.h
index 90079c373f1c462d2957b98b64f5f15b8ea7ac19..04f91c2d3f7b93d88011236b07aa1f71d2a39def 100644 (file)
--- a/include/asm-generic/percpu.h
+++ b/include/asm-generic/percpu.h
@@ -41,7 +41,11 @@ extern unsigned long __per_cpu_offset[NR_CPUS];
  * Only S390 provides its own means of moving the pointer.
  */
 #ifndef SHIFT_PERCPU_PTR
-#define SHIFT_PERCPU_PTR(__p, __offset)        RELOC_HIDE((__p), (__offset))
+/* Weird cast keeps both GCC and sparse happy. */
+#define SHIFT_PERCPU_PTR(__p, __offset)        ({                              \
+       __verify_pcpu_ptr((__p));                                       \
+       RELOC_HIDE((typeof(*(__p)) __kernel __force *)(__p), (__offset)); \
+})
 #endif
 
 /*
@@ -50,11 +54,14 @@ extern unsigned long __per_cpu_offset[NR_CPUS];
  * offset.
  */
 #define per_cpu(var, cpu) \
-       (*SHIFT_PERCPU_PTR(&per_cpu_var(var), per_cpu_offset(cpu)))
+       (*SHIFT_PERCPU_PTR(&(var), per_cpu_offset(cpu)))
 #define __get_cpu_var(var) \
-       (*SHIFT_PERCPU_PTR(&per_cpu_var(var), my_cpu_offset))
+       (*SHIFT_PERCPU_PTR(&(var), my_cpu_offset))
 #define __raw_get_cpu_var(var) \
-       (*SHIFT_PERCPU_PTR(&per_cpu_var(var), __my_cpu_offset))
+       (*SHIFT_PERCPU_PTR(&(var), __my_cpu_offset))
+
+#define this_cpu_ptr(ptr) SHIFT_PERCPU_PTR(ptr, my_cpu_offset)
+#define __this_cpu_ptr(ptr) SHIFT_PERCPU_PTR(ptr, __my_cpu_offset)
 
 
 #ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA
@@ -63,9 +70,11 @@ extern void setup_per_cpu_areas(void);
 
 #else /* ! SMP */
 
-#define per_cpu(var, cpu)                      (*((void)(cpu), &per_cpu_var(var)))
-#define __get_cpu_var(var)                     per_cpu_var(var)
-#define __raw_get_cpu_var(var)                 per_cpu_var(var)
+#define per_cpu(var, cpu)                      (*((void)(cpu), &(var)))
+#define __get_cpu_var(var)                     (var)
+#define __raw_get_cpu_var(var)                 (var)
+#define this_cpu_ptr(ptr) per_cpu_ptr(ptr, 0)
+#define __this_cpu_ptr(ptr) this_cpu_ptr(ptr)
 
 #endif /* SMP */