[RFT] Revert "lockdep: Enable PROVE_RAW_LOCK_NESTING with PROVE_LOCKING."

[Luca Coelho]

This reverts commit 560af5dc839eef08a273908f390cfefefb82aa04.

Signed-off-by: Luca Coelho <luciano.coelho at intel.com>
---

It seems that we have a few issues with this configuration in xe and
in i915.  Let's try to revert it to see if the problems we're seeing
go away.

Note, these are _real_ issues, but only if CONFIG_RT is enabled, so the actual issues need to be solved properly, but we can revert this change until then, to avoid regressions.


 lib/Kconfig.debug | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index f3d723705879..de4ffe09323b 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1397,14 +1397,22 @@ config PROVE_LOCKING
 	 For more details, see Documentation/locking/lockdep-design.rst.
 
 config PROVE_RAW_LOCK_NESTING
-	bool
+	bool "Enable raw_spinlock - spinlock nesting checks"
 	depends on PROVE_LOCKING
-	default y
+	default n
 	help
 	 Enable the raw_spinlock vs. spinlock nesting checks which ensure
 	 that the lock nesting rules for PREEMPT_RT enabled kernels are
 	 not violated.
 
+	 NOTE: There are known nesting problems. So if you enable this
+	 option expect lockdep splats until these problems have been fully
+	 addressed which is work in progress. This config switch allows to
+	 identify and analyze these problems. It will be removed and the
+	 check permanently enabled once the main issues have been fixed.
+
+	 If unsure, select N.
+
 config LOCK_STAT
 	bool "Lock usage statistics"
 	depends on DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT
-- 
2.45.2