Merge remote-tracking branch 'rcu/rcu/next'

[karo-tx-linux.git] / arch / Kconfig

diff --git a/arch/Kconfig b/arch/Kconfig
index 07db9299ea86e802374eb18176622d630f14fcb8..d5176b861e32c4278bbfa09b1ddfcc0fa090fe41 100644 (file)
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -316,4 +316,14 @@ config MODULES_USE_ELF_REL
 config HAVE_VIRT_CPU_ACCOUNTING
        bool
 
+config HAVE_RCU_USER_QS
+       bool
+       help
+         Provide kernel entry/exit hooks necessary for userspace
+         RCU extended quiescent state. Syscalls need to be wrapped inside
+         rcu_user_exit()-rcu_user_enter() through the slow path using
+         TIF_NOHZ flag. Exceptions handlers must be wrapped as well. Irqs
+         are already protected inside rcu_irq_enter/rcu_irq_exit() but
+         preemption or signal handling on irq exit still need to be protected.
+
 source "kernel/gcov/Kconfig"