linux-kernel - [PATCH 2/2] lockdep: Up MAX_LOCKDEP

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Date:   Wed, 29 Nov 2017 16:41:45 +0100
From:   Daniel Vetter <daniel.vetter@...ll.ch>
To:     LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     Intel Graphics Development <intel-gfx@...ts.freedesktop.org>,
        Tejun Heo <tj@...nel.org>, Kees Cook <keescook@...omium.org>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Tvrtko Ursulin <tvrtko.ursulin@...el.com>,
        Marta Lofstedt <marta.lofstedt@...el.com>,
        Daniel Vetter <daniel.vetter@...el.com>
Subject: [PATCH 2/2] lockdep: Up MAX_LOCKDEP_CHAINS

cross-release ftl

>From Chris:

"Fwiw, this isn't cross-release but us reloading the module many times,
creating a whole host of new lockclasses. Even more fun is when the
module gets a slightly different address and the new lock address hashes
into an old lock...

"I did think about a module-hook to revoke the stale lockclasses, but
that still leaves all the hashed chains.

"This particular nuisance was temporarily pushed back by teaching igt not
to reload i915.ko on a whim."

Cc: Tvrtko Ursulin <tvrtko.ursulin@...el.com>
Cc: Marta Lofstedt <marta.lofstedt@...el.com>
References: https://bugs.freedesktop.org/show_bug.cgi?id=103707
Signed-off-by: Daniel Vetter <daniel.vetter@...el.com>
---
 kernel/locking/lockdep_internals.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/locking/lockdep_internals.h b/kernel/locking/lockdep_internals.h
index d459d624ba2a..41630a5385c6 100644
--- a/kernel/locking/lockdep_internals.h
+++ b/kernel/locking/lockdep_internals.h
@@ -69,7 +69,7 @@ enum {
 #else
 #define MAX_LOCKDEP_ENTRIES	32768UL
 
-#define MAX_LOCKDEP_CHAINS_BITS	16
+#define MAX_LOCKDEP_CHAINS_BITS	17
 
 /*
  * Stack-trace: tightly packed array of stack backtrace
-- 
2.15.0