linux-kernel - [PATCH] rcu: remove SPARSE_RCU

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Date:	Tue, 04 Jan 2011 16:43:01 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Arnd Bergmann <arnd@...db.de>, Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] rcu: remove SPARSE_RCU_POINTER


As I known, __rcu annotations do not effect the result compiled kernel.

They work only when we use spare("make C=1" or "make C=2"),
So we don't need another new switch for it since we have one
for debugging(use spare or not).

signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
---
diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index 320d6c9..0ab21c2 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -16,11 +16,7 @@
 # define __release(x)	__context__(x,-1)
 # define __cond_lock(x,c)	((c) ? ({ __acquire(x); 1; }) : 0)
 # define __percpu	__attribute__((noderef, address_space(3)))
-#ifdef CONFIG_SPARSE_RCU_POINTER
 # define __rcu		__attribute__((noderef, address_space(4)))
-#else
-# define __rcu
-#endif
 extern void __chk_user_ptr(const volatile void __user *);
 extern void __chk_io_ptr(const volatile void __iomem *);
 #else
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 8be18e5..bf9c5d3 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -563,21 +563,6 @@ config PROVE_RCU_REPEATEDLY
 
 	 Say N if you are unsure.
 
-config SPARSE_RCU_POINTER
-	bool "RCU debugging: sparse-based checks for pointer usage"
-	default n
-	help
-	 This feature enables the __rcu sparse annotation for
-	 RCU-protected pointers.  This annotation will cause sparse
-	 to flag any non-RCU used of annotated pointers.  This can be
-	 helpful when debugging RCU usage.  Please note that this feature
-	 is not intended to enforce code cleanliness; it is instead merely
-	 a debugging aid.
-
-	 Say Y to make sparse flag questionable use of RCU-protected pointers
-
-	 Say N if you are unsure.
-
 config LOCKDEP
 	bool
 	depends on DEBUG_KERNEL && TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT
--
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