linux-kernel - [PATCH 1/5] percpu: add sanity check for UP

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Message-Id: <1281119187-12640-1-git-send-email-namhyung@gmail.com>
Date:	Sat,  7 Aug 2010 03:26:23 +0900
From:	Namhyung Kim <namhyung@...il.com>
To:	tj@...nel.org
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH 1/5] percpu: add sanity check for UP

add sanity check for percpu accessors on UP.
This removes lots of sparse warnings.

Signed-off-by: Namhyung Kim <namhyung@...il.com>
---
 include/asm-generic/percpu.h |   12 +++++++++---
 include/linux/percpu.h       |    2 +-
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/include/asm-generic/percpu.h b/include/asm-generic/percpu.h
index b5043a9..50ac3ac 100644
--- a/include/asm-generic/percpu.h
+++ b/include/asm-generic/percpu.h
@@ -70,9 +70,15 @@ extern void setup_per_cpu_areas(void);
 
 #else /* ! SMP */
 
-#define per_cpu(var, cpu)			(*((void)(cpu), &(var)))
-#define __get_cpu_var(var)			(var)
-#define __raw_get_cpu_var(var)			(var)
+#define VERIFY_PERCPU_PTR(__p) ({			\
+	__verify_pcpu_ptr((__p));			\
+	(typeof(*(__p)) __kernel __force *) (__p);	\
+})
+
+#define per_cpu(var, cpu) \
+	(*((void)(cpu), VERIFY_PERCPU_PTR(&(var))))
+#define __get_cpu_var(var)		(*VERIFY_PERCPU_PTR(&(var)))
+#define __raw_get_cpu_var(var)		(*VERIFY_PERCPU_PTR(&(var)))
 #define this_cpu_ptr(ptr) per_cpu_ptr(ptr, 0)
 #define __this_cpu_ptr(ptr) this_cpu_ptr(ptr)
 
diff --git a/include/linux/percpu.h b/include/linux/percpu.h
index d3a38d6..bc36301 100644
--- a/include/linux/percpu.h
+++ b/include/linux/percpu.h
@@ -143,7 +143,7 @@ extern void __init setup_per_cpu_areas(void);
 
 #else /* CONFIG_SMP */
 
-#define per_cpu_ptr(ptr, cpu) ({ (void)(cpu); (ptr); })
+#define per_cpu_ptr(ptr, cpu) ({ (void)(cpu); VERIFY_PERCPU_PTR((ptr)); })
 
 /* can't distinguish from other static vars, always false */
 static inline bool is_kernel_percpu_address(unsigned long addr)
-- 
1.7.0.4

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