Merge tag 'v3.12'

Linux 3.12

Conflicts:
	fs/exec.c

1 files changed, 25 insertions, 20 deletions

diff --git a/init/Kconfig b/init/Kconfig
index 18a98c893d07..d8fe0b87e713 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -456,6 +456,7 @@ config TREE_RCU
 config TREE_PREEMPT_RCU
 	bool "Preemptible tree-based hierarchical RCU"
 	depends on PREEMPT
+	select IRQ_WORK
 	help
 	  This option selects the RCU implementation that is
 	  designed for very large SMP systems with hundreds or
@@ -513,13 +514,29 @@ config RCU_USER_QS
 config CONTEXT_TRACKING_FORCE
 	bool "Force context tracking"
 	depends on CONTEXT_TRACKING
-	default CONTEXT_TRACKING
+	default y if !NO_HZ_FULL
 	help
-	  Probe on user/kernel boundaries by default in order to
-	  test the features that rely on it such as userspace RCU extended
-	  quiescent states.
-	  This test is there for debugging until we have a real user like the
-	  full dynticks mode.
+	  The major pre-requirement for full dynticks to work is to
+	  support the context tracking subsystem. But there are also
+	  other dependencies to provide in order to make the full
+	  dynticks working.
+
+	  This option stands for testing when an arch implements the
+	  context tracking backend but doesn't yet fullfill all the
+	  requirements to make the full dynticks feature working.
+	  Without the full dynticks, there is no way to test the support
+	  for context tracking and the subsystems that rely on it: RCU
+	  userspace extended quiescent state and tickless cputime
+	  accounting. This option copes with the absence of the full
+	  dynticks subsystem by forcing the context tracking on all
+	  CPUs in the system.
+
+	  Say Y only if you're working on the developpement of an
+	  architecture backend for the context tracking.
+
+	  Say N otherwise, this option brings an overhead that you
+	  don't want in production.
+
 
 config RCU_FANOUT
 	int "Tree-based hierarchical RCU fanout value"
@@ -1092,7 +1109,6 @@ config IPC_NS
 
 config USER_NS
 	bool "User namespace"
-	depends on UIDGID_CONVERTED
 	select UIDGID_STRICT_TYPE_CHECKS
 
 	default n
@@ -1126,20 +1142,8 @@ config NET_NS
 
 endif # NAMESPACES
 
-config UIDGID_CONVERTED
-	# True if all of the selected software conmponents are known
-	# to have uid_t and gid_t converted to kuid_t and kgid_t
-	# where appropriate and are otherwise safe to use with
-	# the user namespace.
-	bool
-	default y
-
-	# Filesystems
-	depends on XFS_FS = n
-
 config UIDGID_STRICT_TYPE_CHECKS
 	bool "Require conversions between uid/gids and their internal representation"
-	depends on UIDGID_CONVERTED
 	default n
 	help
 	 While the nececessary conversions are being added to all subsystems this option allows
@@ -1584,7 +1588,7 @@ endchoice
 
 config SLUB_CPU_PARTIAL
 	default y
-	depends on SLUB
+	depends on SLUB && SMP
 	bool "SLUB per cpu partial cache"
 	help
 	  Per cpu partial caches accellerate objects allocation and freeing
@@ -1652,6 +1656,7 @@ config BASE_SMALL
 
 menuconfig MODULES
 	bool "Enable loadable module support"
+	option modules
 	help
 	  Kernel modules are small pieces of compiled code which can
 	  be inserted in the running kernel, rather than being