linux-kernel - [075/165] um: Use RWSEM_GENERIC

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Date:	Wed, 01 Jun 2011 17:10:45 +0900
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Richard Weinberger <richard@....at>,
	user-mode-linux-devel@...ts.sourceforge.net,
	Thomas Gleixner <tglx@...utronix.de>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [075/165] um: Use RWSEM_GENERIC_SPINLOCK on x86

2.6.39-stable review patch.  If anyone has any objections, please let us know.

------------------
Content-Length: 1218
Lines: 40

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

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: Greg Kroah-Hartman <gregkh@...e.de>

---
 arch/um/Kconfig.x86 |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/arch/um/Kconfig.x86
+++ b/arch/um/Kconfig.x86
@@ -29,10 +29,10 @@ config X86_64
 	def_bool 64BIT
 
 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


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