linux-kernel - maple_tree.c:3738:1: error: the frame size of 1040 bytes is larger than 1024 bytes

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Message-ID: <769dc761-3ea6-76b9-d6a3-cd64a3fddfe3@nerdbynature.de>
Date: Thu, 30 Oct 2025 14:35:12 +0100 (CET)
From: Christian Kujau <lists@...dbynature.de>
To: linux-kernel@...r.kernel.org
cc: "Liam R. Howlett" <Liam.Howlett@...cle.com>, Arnd Bergmann <arnd@...db.de>
Subject: maple_tree.c:3738:1: error: the frame size of 1040 bytes is larger
 than 1024 bytes

Hi,

while cross-compiling the latest mainline checkout for x86_64, this 
happened:

------------------
$ make -j24 O=${DIR} ARCH=x86 CROSS_COMPILE=x86_64-linux-gnu- \
            CC="x86_64-linux-gnu-gcc" bzImage
[...]
  CC      lib/maple_tree.o
lib/maple_tree.c: In function ‘mas_wr_bnode’:
lib/maple_tree.c:3738:1: error: the frame size of 1040 bytes is larger than 1024 bytes [-Werror=frame-larger-than=]
 3738 | }
      | ^
cc1: all warnings being treated as errors
------------------

This is basically "allnoconfig" with CONFIG_WERROR and some debugging 
options enabled. I found 44081c77e8a4 ("maple_tree: reduce stack usage 
with gcc-9 and earlier") where a similar issue has been reported before, 
but this was 2023. I'm trying to build this on a Debian/13 arm64 system:

$ x86_64-linux-gnu-gcc --version | head -1
x86_64-linux-gnu-gcc (Debian 14.2.0-19) 14.2.0

Git bisect pointed to:

------------------
 commit 9b05890a25d9197e39fcf5b2298f0b911c323306
 Author: Liam R. Howlett <Liam.Howlett@...cle.com>
 Date:   Wed Sep 3 15:00:01 2025 +0200

    maple_tree: Prefilled sheaf conversion and testing
------------------

This looks related, but I was unable to revert only this commit. I can try 
harder, but maybe someone has an idea how to tackle this.

Thanks,
Christian.
-- 
BOFH excuse #374:

It's the InterNIC's fault.
View attachment "config_maple_tree_test.txt" of type "text/plain" (40467 bytes)