From: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Date: Wed, 15 Jun 2016 15:56:53 +0000 (-0700)
Subject: rcu: Disable TASKS_RCU for usermode Linux
X-Git-Tag: v4.8-rc1~188^2^2^2~4
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=570dd3c7424179b831decb655ea9dd1ecea38adc;p=thirdparty%2Fkernel%2Flinux.git

rcu: Disable TASKS_RCU for usermode Linux

Usermode Linux currently does not implement arch_irqs_disabled_flags(),
which results in a build failure in TASKS_RCU.  Therefore, this commit
disables the TASKS_RCU Kconfig option in usermode Linux builds.  The
usermode Linux maintainers expect to merge arch_irqs_disabled_flags()
into 4.8, at which point this commit may be reverted.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Jeff Dike <jdike@addtoit.com>
Acked-by: Richard Weinberger <richard@nod.at>
---

diff --git a/init/Kconfig b/init/Kconfig
index f755a602d4a17..a068265fbcaf1 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -517,6 +517,7 @@ config SRCU
 config TASKS_RCU
 	bool
 	default n
+	depends on !UML
 	select SRCU
 	help
 	  This option enables a task-based RCU implementation that uses