linux-kernel - [v2.6.34-stable 75/77] um: Use RWSEM_GENERIC

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Date:	Tue, 8 Jan 2013 18:35:54 -0500
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	<stable@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:	Richard Weinberger <richard@....at>,
	<user-mode-linux-devel@...ts.sourceforge.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: [v2.6.34-stable 75/77] um: Use RWSEM_GENERIC_SPINLOCK on x86

From: Richard Weinberger <richard@....at>

                   -------------------
    This is a commit scheduled for the next v2.6.34 longterm release.
    http://git.kernel.org/?p=linux/kernel/git/paulg/longterm-queue-2.6.34.git
    If you see a problem with using this for longterm, please comment.
                   -------------------

commit 3a3679078aed2c451ebc32836bbd3b8219a65e01 upstream.

Commit d12337 (rwsem: Remove redundant asmregparm annotation)
broke rwsem on UML.

As we cannot compile UML with -mregparm=3 and keeping asmregparm only
for UML is inadequate the easiest solution is using RWSEM_GENERIC_SPINLOCK.

Thanks to Thomas Gleixner for the idea.

Reported-by: Toralf Förster <toralf.foerster@....de>
Tested-by: Toralf Förster <toralf.foerster@....de>
Signed-off-by: Richard Weinberger <richard@....at>
Cc: user-mode-linux-devel@...ts.sourceforge.net
Link: http://lkml.kernel.org/r/%3C1306183893-26655-1-git-send-email-richard%40nod.at%3E
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
---
 arch/um/Kconfig.x86 | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/um/Kconfig.x86 b/arch/um/Kconfig.x86
index 5ee3280..91668e1 100644
--- a/arch/um/Kconfig.x86
+++ b/arch/um/Kconfig.x86
@@ -20,10 +20,10 @@ config X86_32
 	select HAVE_AOUT
 
 config RWSEM_XCHGADD_ALGORITHM
-	def_bool X86_XADD
+	def_bool X86_XADD && 64BIT
 
 config RWSEM_GENERIC_SPINLOCK
-	def_bool !X86_XADD
+	def_bool !RWSEM_XCHGADD_ALGORITHM
 
 config 3_LEVEL_PGTABLES
 	bool "Three-level pagetables (EXPERIMENTAL)" if !64BIT
-- 
1.7.12.1

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