linux-kernel - Re: [GIT PULL] locking tree changes for v3.16

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Date:	Thu, 5 Jun 2014 14:35:12 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Davidlohr Bueso <davidlohr@...com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	"Paul E. McKenney" <paulmck@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [GIT PULL] locking tree changes for v3.16


* Peter Zijlstra <peterz@...radead.org> wrote:

> On Thu, Jun 05, 2014 at 01:11:10PM +0200, Ingo Molnar wrote:
> > Unfortunately even with the latest bits from you the breakage I 
> > reported weeks ago is not resolved:
> 
> crap, its the qrwlock bits, I fixed it for the config you gave me. 
> Some paravirt crap header hell thing. Happen to have another 
> .config?

A simple 'make defconfig' triggers the build failure for me:

  kernel/locking/qrwlock.c:24:25: fatal error: asm/qrwlock.h: No such file or directory

If I apply the minimal feature-enabling patch below on top of the base 
qrwlock patch.

Thanks,

	Ingo

==========================>
>From a79dedeee44dadf8e033a047b7cd4409bb7ad0d8 Mon Sep 17 00:00:00 2001
From: Waiman Long <Waiman.Long@...com>
Date: Mon, 3 Feb 2014 13:18:57 +0100
Subject: [PATCH] x86, locking: Switch x86 to qrwlock-style rwlocks

Make x86 use the fair rwlock_t.

Don't implement a custom queue_write_unlock() yet, use the generic path.

Signed-off-by: Waiman Long <Waiman.Long@...com>
Signed-off-by: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/n/tip-r1xuzmdysvuhl3h86n5fbxi7@git.kernel.org
Cc: "Paul E.McKenney" <paulmck@...ux.vnet.ibm.com>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: Dave Jones <davej@...hat.com>
Cc: Jeremy Fitzhardinge <jeremy@...p.org>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
[ Simplified it. ]
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 25d2c6f..bf7626f 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -121,6 +121,7 @@ config X86
 	select MODULES_USE_ELF_RELA if X86_64
 	select CLONE_BACKWARDS if X86_32
 	select ARCH_USE_BUILTIN_BSWAP
+	select ARCH_USE_QUEUE_RWLOCK
 	select OLD_SIGSUSPEND3 if X86_32 || IA32_EMULATION
 	select OLD_SIGACTION if X86_32
 	select COMPAT_OLD_SIGACTION if IA32_EMULATION
--
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