linux-kernel - [PATCH] lockdep: Fix upper limit for LOCKDEP

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Message-ID: <20250314064729.163602-1-zhangxiaomeng13@huawei.com>
Date: Fri, 14 Mar 2025 06:47:29 +0000
From: Xiaomeng Zhang <zhangxiaomeng13@...wei.com>
To: Carlos Llamas <cmllamas@...gle.com>
CC: Andrew Morton <akpm@...ux-foundation.org>, <linux-kernel@...r.kernel.org>,
	Boqun Feng <boqun.feng@...il.com>, "J. R. Okajima" <hooanon05g@...il.com>,
	Peter Zijlstra <peterz@...radead.org>, Waiman Long <longman@...hat.com>, Ingo
 Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>
Subject: [PATCH] lockdep: Fix upper limit for LOCKDEP_BITS configs

The upper limit that was initially setup for LOCKDEP_BITS configs
is too high (24 bit shift), which causes the kernel image size to exceed
KERNEL_IMAGE_SIZE (1024MB) limit. When LOCKDEP_BITS is set to 24,
the kernel image size grows to 1562.19MB.

Adjust LOCKDEP_BITS to 22, which results in a kernel image size of
888.19MB, keeping it under the KERNEL_IMAGE_SIZE limit while still
maintaining adequate debug information capacity.

This change prevents the linker error:
  ld: kernel image bigger than KERNEL_IMAGE_SIZE

Fixes: e638072e6172 ("lockdep: Fix upper limit for LOCKDEP_*_BITS configs")
Signed-off-by: Xiaomeng Zhang <zhangxiaomeng13@...wei.com>
---
 lib/Kconfig.debug | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 35796c290ca3..6faba965a349 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1504,7 +1504,7 @@ config LOCKDEP_SMALL
 config LOCKDEP_BITS
 	int "Size for MAX_LOCKDEP_ENTRIES (as Nth power of 2)"
 	depends on LOCKDEP && !LOCKDEP_SMALL
-	range 10 24
+	range 10 22
 	default 15
 	help
 	  Try increasing this value if you hit "BUG: MAX_LOCKDEP_ENTRIES too low!" message.
-- 
2.34.1