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Message-Id: <1409152766-31320-1-git-send-email-robdclark@gmail.com> Date: Wed, 27 Aug 2014 11:19:26 -0400 From: Rob Clark <robdclark@...il.com> To: linux-kernel@...r.kernel.org Cc: maarten.lankhorst@...onical.com, Daniel Vetter <daniel@...ll.ch>, dri-devel@...ts.freedesktop.org, Rob Clark <robdclark@...il.com> Subject: [PATCH] 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@...il.com> --- lib/Kconfig.debug | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 07c2832..1b233fc 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" -- 1.9.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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