linux-kernel - [PATCH] rcu: avoid checking for constant

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Message-Id: <1326345104-6919-1-git-send-email-jengelh@medozas.de>
Date:	Thu, 12 Jan 2012 06:11:44 +0100
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	paulmck@...ux.vnet.ibm.com
Cc:	laijs@...fujitsu.com, manfred@...orfullife.com,
	dhowells@...hat.com, josh@...htriplett.org,
	linux-kernel@...r.kernel.org, jengelh@...ozas.de
Subject: [PATCH] rcu: avoid checking for constant

When compiling kernel or module code with -O0, "offset" is no longer
considered a constant, and therefore always triggers the build error
that BUILD_BUG_ON is defined to yield.

What is the rationale between the forced constant check,
introduced in 9ab1544eb4196ca8d05c433b2eb56f74496b1ee3?

Signed-off-by: Jan Engelhardt <jengelh@...ozas.de>
---
 include/linux/rcupdate.h |    2 --
 1 files changed, 0 insertions(+), 2 deletions(-)

diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index 2cf4226..38c5ba5 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -805,8 +805,6 @@ void __kfree_rcu(struct rcu_head *head, unsigned long offset)
 {
 	typedef void (*rcu_callback)(struct rcu_head *);
 
-	BUILD_BUG_ON(!__builtin_constant_p(offset));
-
 	/* See the kfree_rcu() header comment. */
 	BUILD_BUG_ON(!__is_kfree_rcu_offset(offset));
 
-- 
1.7.7

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