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Message-ID: <26a97504-36ac-4005-a146-09895ae76645@roeck-us.net>
Date: Mon, 8 Dec 2025 22:58:53 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: Alexandre Chartre <alexandre.chartre@...cle.com>
Cc: linux-kernel@...r.kernel.org, mingo@...nel.org, jpoimboe@...nel.org,
peterz@...radead.org, david.laight.linux@...il.com
Subject: Re: [PATCH v6 03/30] objtool: Disassemble code with libopcodes
instead of running objdump
Hi,
On Fri, Nov 21, 2025 at 10:53:13AM +0100, Alexandre Chartre wrote:
> objtool executes the objdump command to disassemble code. Use libopcodes
> instead to have more control about the disassembly scope and output.
> If libopcodes is not present then objtool is built without disassembly
> support.
>
> Signed-off-by: Alexandre Chartre <alexandre.chartre@...cle.com>
With this patch in mainline, I get the following build error when trying
to build x86_64:defconfig (and other configurations).
Bisect log is attached. I see the problem with gcc 11.4.0, 13.3.0, and
14.3.0. I tried with both Ubuntu 22.04 and 24.04.
Guenter
---
Building x86_64:defconfig ... failed
--------------
Error log:
In file included from disas.c:17:
tools/include/tools/dis-asm-compat.h:19:39: error: ‘enum disassembler_style’ declared inside parameter list will not be visible outside of this definition or declaration [-Werror]
19 | enum disassembler_style style,
| ^~~~~~~~~~~~~~~~~~
tools/include/tools/dis-asm-compat.h:19:58: error: parameter 2 (‘style’) has incomplete type
19 | enum disassembler_style style,
| ~~~~~~~~~~~~~~~~~~~~~~~~^~~~~
tools/include/tools/dis-asm-compat.h:42:49: error: unknown type name ‘fprintf_styled_ftype’; did you mean ‘fprintf_ftype’?
42 | fprintf_styled_ftype styled_func)
| ^~~~~~~~~~~~~~~~~~~~
| fprintf_ftype
disas.c:152:38: error: ‘enum disassembler_style’ declared inside parameter list will not be visible outside of this definition or declaration [-Werror]
152 | enum disassembler_style style,
| ^~~~~~~~~~~~~~~~~~
disas.c:152:57: error: parameter 2 (‘style’) has incomplete type
152 | enum disassembler_style style,
| ~~~~~~~~~~~~~~~~~~~~~~~~^~~~~
disas.c: In function ‘disas_context_create’:
disas.c:367:9: error: implicit declaration of function ‘init_disassemble_info_compat’; did you mean ‘init_disassemble_info’? [-Werror=implicit-function-declaration]
367 | init_disassemble_info_compat(dinfo, dctx,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
| init_disassemble_info
In file included from tools/include/linux/kernel.h:5,
from tools/include/linux/list.h:7,
from tools/objtool/include/objtool/arch.h:10,
from disas.c:9:
disas.c: In function ‘disas_fprintf_styled’:
disas.c:158:9: error: ‘va_start’ used in function with fixed arguments
158 | va_start(arg, fmt);
| ^~~~~~~~
cc1: all warnings being treated as errors
---
Bisect:
# bad: [cb015814f8b6eebcbb8e46e111d108892c5e6821] Merge tag 'f2fs-for-6.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs
# good: [7d0a66e4bb9081d75c82ec4957c50034cb0ea449] Linux 6.18
git bisect start 'HEAD' 'v6.18'
# bad: [6dfafbd0299a60bfb5d5e277fdf100037c7ded07] Merge tag 'drm-next-2025-12-03' of https://gitlab.freedesktop.org/drm/kernel
git bisect bad 6dfafbd0299a60bfb5d5e277fdf100037c7ded07
# bad: [8f7aa3d3c7323f4ca2768a9e74ebbe359c4f8f88] Merge tag 'net-next-6.19' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next
git bisect bad 8f7aa3d3c7323f4ca2768a9e74ebbe359c4f8f88
# bad: [4a4e0199378f309fa7259132e1443efe56c1e276] Merge tag 'lkmm.2025.12.01a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu
git bisect bad 4a4e0199378f309fa7259132e1443efe56c1e276
# bad: [a61288200e8b6f42bff116508dc72ebcc206f10a] Merge tag 'ras_core_for_v6.19_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect bad a61288200e8b6f42bff116508dc72ebcc206f10a
# good: [1b5dd29869b1e63f7e5c37d7552e2dcf22de3c26] Merge tag 'vfs-6.19-rc1.fd_prepare.fs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
git bisect good 1b5dd29869b1e63f7e5c37d7552e2dcf22de3c26
# bad: [dcd8637edb873bd940e6aa82417dfb33ae980778] Merge tag 'x86-core-2025-12-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect bad dcd8637edb873bd940e6aa82417dfb33ae980778
# bad: [7e017720aae87dc2ca2471ac295e34e2b240e5f5] objtool: Disassemble jump table alternatives
git bisect bad 7e017720aae87dc2ca2471ac295e34e2b240e5f5
# good: [164c9201e1dad8d5c0c38f583dba81e4b6da9cc7] objtool: Add base objtool support for livepatch modules
git bisect good 164c9201e1dad8d5c0c38f583dba81e4b6da9cc7
# good: [9205a322cf96f16a49e412dfa3f09431f3e02fc5] objtool: Return canonical symbol when aliases exist in symbol finding helpers
git bisect good 9205a322cf96f16a49e412dfa3f09431f3e02fc5
# bad: [0bb080ba6469a573bc85122153d931334d10a173] objtool: Disassemble instruction on warning or backtrace
git bisect bad 0bb080ba6469a573bc85122153d931334d10a173
# good: [93863f3f859a626347ce2ec18947b11357b4ca14] kbuild: Check for functions with ambiguous -ffunction-sections section names
git bisect good 93863f3f859a626347ce2ec18947b11357b4ca14
# bad: [59953303827eceb06d486ba66cc0d71f55ded8ec] objtool: Disassemble code with libopcodes instead of running objdump
git bisect bad 59953303827eceb06d486ba66cc0d71f55ded8ec
# good: [55d2a473f317ab028d78a5c5ca69473643657c3d] objtool: Move disassembly functions to a separated file
git bisect good 55d2a473f317ab028d78a5c5ca69473643657c3d
# good: [1013f2e37bec39b1df5679e1c1e2572ece87c088] objtool: Create disassembly context
git bisect good 1013f2e37bec39b1df5679e1c1e2572ece87c088
# first bad commit: [59953303827eceb06d486ba66cc0d71f55ded8ec] objtool: Disassemble code with libopcodes instead of running objdump
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