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SubjectPATCH: Re: LOCKDEP customizable numbers upper limit
From
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Tetsuo Handa:
> Please submit a patch that avoids only BUILD_BUG_ON().

Here it is.

J. R. Okajima

----------------------------------------
commit 43e103e1a5975c61334811d16e207e6d0ac57b77
Author: J. R. Okajima <hooanon05g@gmail.com>
Date: Sat May 15 03:17:10 2021 +0900

LOCKDEP: upper limit LOCKDEP_CHAINS_BITS

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://marc.info/?l=linux-kernel&m=162091320503900&w=2
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 678c13967580e..999ed5aa6bcee 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1390,7 +1390,7 @@ 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.
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