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authorTejun Heo <tj@kernel.org>2014-06-18 03:12:37 +0400
committerTejun Heo <tj@kernel.org>2014-06-18 03:12:37 +0400
commit3b8ed91d6463f48ab180f5ebedc9663eddfa0587 (patch)
treeaa4bc7521723915ab12f52547df938a9f0e8a2cc /include/linux/percpu-defs.h
parent9defda18f913181debfe7cdc8c0a752f707ac861 (diff)
downloadlinux-3b8ed91d6463f48ab180f5ebedc9663eddfa0587.tar.xz
percpu: reorganize include/linux/percpu-defs.h
Reorganize for better readability. * Accessor definitions are collected into one place and SMP and UP now define them in the same order. * Definitions are layered when possible - e.g. per_cpu() is now defined in terms of this_cpu_ptr(). * Rather pointless comment dropped. * per_cpu(), __raw_get_cpu_var() and __get_cpu_var() are defined in a way which can be shared between SMP and UP and moved out of CONFIG_SMP blocks. This patch doesn't introduce any functional difference. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Christoph Lameter <cl@linux-foundation.org>
Diffstat (limited to 'include/linux/percpu-defs.h')
-rw-r--r--include/linux/percpu-defs.h32
1 files changed, 9 insertions, 23 deletions
diff --git a/include/linux/percpu-defs.h b/include/linux/percpu-defs.h
index f782f98004db..94cd90afadac 100644
--- a/include/linux/percpu-defs.h
+++ b/include/linux/percpu-defs.h
@@ -215,15 +215,8 @@
RELOC_HIDE((typeof(*(__p)) __kernel __force *)(__p), (__offset)); \
})
-/*
- * A percpu variable may point to a discarded regions. The following are
- * established ways to produce a usable pointer from the percpu variable
- * offset.
- */
-#define per_cpu(var, cpu) \
- (*SHIFT_PERCPU_PTR(&(var), per_cpu_offset(cpu)))
-
-#define raw_cpu_ptr(ptr) arch_raw_cpu_ptr(ptr)
+#define per_cpu_ptr(ptr, cpu) SHIFT_PERCPU_PTR((ptr), per_cpu_offset((cpu)))
+#define raw_cpu_ptr(ptr) arch_raw_cpu_ptr(ptr)
#ifdef CONFIG_DEBUG_PREEMPT
#define this_cpu_ptr(ptr) SHIFT_PERCPU_PTR(ptr, my_cpu_offset)
@@ -231,9 +224,6 @@
#define this_cpu_ptr(ptr) raw_cpu_ptr(ptr)
#endif
-#define __get_cpu_var(var) (*this_cpu_ptr(&(var)))
-#define __raw_get_cpu_var(var) (*raw_cpu_ptr(&(var)))
-
#else /* CONFIG_SMP */
#define VERIFY_PERCPU_PTR(__p) ({ \
@@ -241,14 +231,16 @@
(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 raw_cpu_ptr(ptr) this_cpu_ptr(ptr)
+#define per_cpu_ptr(ptr, cpu) ({ (void)(cpu); VERIFY_PERCPU_PTR((ptr)); })
+#define raw_cpu_ptr(ptr) per_cpu_ptr(ptr, 0)
+#define this_cpu_ptr(ptr) raw_cpu_ptr(ptr)
#endif /* CONFIG_SMP */
+#define per_cpu(var, cpu) (*per_cpu_ptr(&(var), cpu))
+#define __raw_get_cpu_var(var) (*raw_cpu_ptr(&(var)))
+#define __get_cpu_var(var) (*this_cpu_ptr(&(var)))
+
/* keep until we have removed all uses of __this_cpu_ptr */
#define __this_cpu_ptr(ptr) raw_cpu_ptr(ptr)
@@ -278,11 +270,5 @@
preempt_enable(); \
} while (0)
-#ifdef CONFIG_SMP
-#define per_cpu_ptr(ptr, cpu) SHIFT_PERCPU_PTR((ptr), per_cpu_offset((cpu)))
-#else
-#define per_cpu_ptr(ptr, cpu) ({ (void)(cpu); VERIFY_PERCPU_PTR((ptr)); })
-#endif
-
#endif /* __ASSEMBLY__ */
#endif /* _LINUX_PERCPU_DEFS_H */