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authorRob Clark <robdclark@gmail.com>2014-08-27 11:19:26 -0400
committerDave Airlie <airlied@redhat.com>2014-08-28 11:34:43 +1000
commit4d6923733f158e7f8f0695b43c30c22a59ec0a34 (patch)
tree32a4f130097806f77fe14c157784998c2e130fff
parenta80612273cf7369e321f101845e7c8844d875cd9 (diff)
downloadlinux-stericsson-4d6923733f158e7f8f0695b43c30c22a59ec0a34.tar.gz
ww-mutex: clarify help text for DEBUG_WW_MUTEX_SLOWPATH
We really don't want distro's enabling this in their kernels. Try and make that more clear. Signed-off-by: Rob Clark <robdclark@gmail.com> Acked-by: Maarten Lankhorst <maarten.lankhorst@canonical.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
-rw-r--r--lib/Kconfig.debug4
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 07c28323f88f..1b233fc67466 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -892,6 +892,10 @@ config DEBUG_WW_MUTEX_SLOWPATH
the full mutex checks enabled with (CONFIG_PROVE_LOCKING) this
will test all possible w/w mutex interface abuse with the
exception of simply not acquiring all the required locks.
+ Note that this feature can introduce significant overhead, so
+ it really should not be enabled in a production or distro kernel,
+ even a debug kernel. If you are a driver writer, enable it. If
+ you are a distro, do not.
config DEBUG_LOCK_ALLOC
bool "Lock debugging: detect incorrect freeing of live locks"