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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2015-05-06 09:04:22 +0300
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2015-05-27 22:59:07 +0300
commit1ce46ee597bc36fde6984e91aecc2d662a754199 (patch)
treee8168043f8921ac78f74c88144918b1b4d4509fb /lib/Kconfig.debug
parente72aeafc66060d3fc6b4d2120db00058572b3186 (diff)
downloadlinux-1ce46ee597bc36fde6984e91aecc2d662a754199.tar.xz
rcu: Conditionally compile RCU's eqs warnings
This commit applies some warning-omission micro-optimizations to RCU's various extended-quiescent-state functions, which are on the kernel/user hotpath for CONFIG_NO_HZ_FULL=y. Reported-by: Rik van Riel <riel@redhat.com> Reported by: Mike Galbraith <umgwanakikbuti@gmail.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'lib/Kconfig.debug')
-rw-r--r--lib/Kconfig.debug11
1 files changed, 11 insertions, 0 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index c4e1cf04cf57..b908048f8d6a 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1373,6 +1373,17 @@ config RCU_TRACE
Say Y here if you want to enable RCU tracing
Say N if you are unsure.
+config RCU_EQS_DEBUG
+ bool "Use this when adding any sort of NO_HZ support to your arch"
+ depends on DEBUG_KERNEL
+ help
+ This option provides consistency checks in RCU's handling of
+ NO_HZ. These checks have proven quite helpful in detecting
+ bugs in arch-specific NO_HZ code.
+
+ Say N here if you need ultimate kernel/user switch latencies
+ Say Y if you are unsure
+
endmenu # "RCU Debugging"
config DEBUG_BLOCK_EXT_DEVT