linux-kernel - [PATCH v2] lockdep: upper limit LOCKDEP_CHAINS

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Message-ID: <20240723164018.2489615-1-cmllamas@google.com>
Date: Tue, 23 Jul 2024 16:40:17 +0000
From: Carlos Llamas <cmllamas@...gle.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org, kernel-team@...roid.com, 
	"J. R. Okajima" <hooanon05g@...il.com>, Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>, 
	Peter Zijlstra <peterz@...radead.org>, Carlos Llamas <cmllamas@...gle.com>
Subject: [PATCH v2] lockdep: upper limit LOCKDEP_CHAINS_BITS

From: "J. R. Okajima" <hooanon05g@...il.com>

CONFIG_LOCKDEP_CHAINS_BITS value decides the size of chain_hlocks[] in
kernel/locking/lockdep.c, and it is checked by add_chain_cache() with
    BUILD_BUG_ON((1UL << 24) <= ARRAY_SIZE(chain_hlocks));
This patch is just to silence BUILD_BUG_ON().

See-also: https://lore.kernel.org/all/30795.1620913191@jrobl/
Cc: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc: Peter Zijlstra <peterz@...radead.org>
Signed-off-by: J. R. Okajima <hooanon05g@...il.com>
Acked-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
[cmllamas: fix minor checkpatch issues in commit log]
Signed-off-by: Carlos Llamas <cmllamas@...gle.com>
---
 lib/Kconfig.debug | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index a30c03a66172..04668248225c 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1515,7 +1515,7 @@ config LOCKDEP_BITS
 config LOCKDEP_CHAINS_BITS
 	int "Bitsize for MAX_LOCKDEP_CHAINS"
 	depends on LOCKDEP && !LOCKDEP_SMALL
-	range 10 30
+	range 10 21
 	default 16
 	help
 	  Try increasing this value if you hit "BUG: MAX_LOCKDEP_CHAINS too low!" message.
-- 
2.45.2.1089.g2a221341d9-goog