linux-kernel - Re: [PATCH v6 00/30] objtool: Function validation tracing

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Message-ID: <7725c588-cbdb-4249-9adb-7a98fd64509a@oracle.com>
Date: Fri, 21 Nov 2025 14:16:50 +0100
From: Alexandre Chartre <alexandre.chartre@...cle.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: alexandre.chartre@...cle.com, linux-kernel@...r.kernel.org,
        mingo@...nel.org, jpoimboe@...nel.org, david.laight.linux@...il.com
Subject: Re: [PATCH v6 00/30] objtool: Function validation tracing


On 11/21/25 11:36, Peter Zijlstra wrote:
> On Fri, Nov 21, 2025 at 10:53:10AM +0100, Alexandre Chartre wrote:
>> Alexandre Chartre (30):
>>    objtool: Move disassembly functions to a separated file
>>    objtool: Create disassembly context
>>    objtool: Disassemble code with libopcodes instead of running objdump
>>    tool build: Remove annoying newline in build output
>>    objtool: Print symbol during disassembly
>>    objtool: Store instruction disassembly result
>>    objtool: Disassemble instruction on warning or backtrace
>>    objtool: Extract code to validate instruction from the validate branch
>>      loop
>>    objtool: Record symbol name max length
>>    objtool: Add option to trace function validation
>>    objtool: Trace instruction state changes during function validation
>>    objtool: Improve register reporting during function validation
>>    objtool: Identify the different types of alternatives
>>    objtool: Add functions to better name alternatives
>>    objtool: Improve tracing of alternative instructions
>>    objtool: Do not validate IBT for .return_sites and .call_sites
>>    objtool: Add the --disas=<function-pattern> action
>>    objtool: Preserve alternatives order
>>    objtool: Print headers for alternatives
>>    objtool: Disassemble group alternatives
>>    objtool: Print addresses with alternative instructions
>>    objtool: Disassemble exception table alternatives
>>    objtool: Disassemble jump table alternatives
>>    objtool: Fix address references in alternatives
>>    objtool: Provide access to feature and flags of group alternatives
>>    objtool: Function to get the name of a CPU feature
>>    objtool: Improve naming of group alternatives
>>    objtool: Compact output for alternatives with one instruction
>>    objtool: Add wide output for disassembly
>>    objtool: Trim trailing NOPs in alternative
> 
> I've pushed out these patches to queue/objtool/core, however when
> building defconfig I get this:
> 
>    CC      /mnt/hirez/usr/src/linux-2.6/defconfig-build/tools/objtool/librbtree.o
> arch/x86/special.c:10:10: fatal error: lib/cpu-feature-names.c: No such file or directory
>     10 | #include "lib/cpu-feature-names.c"
>        |          ^~~~~~~~~~~~~~~~~~~~~~~~~
> compilation terminated.
>

I having a look. The problem is when using the O=<something> option.

Sorry,

alex.