linux-kernel - Re: [PATCH v9 3/8] kbuild: generate an address ranges map at vmlinux link time

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Message-ID: <87v8nhv5vq.fsf@esperi.org.uk>
Date:   Mon, 14 Nov 2022 16:48:57 +0000
From:   Nick Alcock <nick.alcock@...cle.com>
To:     Luis Chamberlain <mcgrof@...nel.org>
Cc:     masahiroy@...nel.org, linux-modules@...r.kernel.org,
        linux-kernel@...r.kernel.org, arnd@...db.de,
        akpm@...ux-foundation.org, eugene.loh@...cle.com,
        kris.van.hees@...cle.com, thunder.leizhen@...wei.com,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH v9 3/8] kbuild: generate an address ranges map at
 vmlinux link time

[Added Steve Rostedt to Cc:]

On 13 Nov 2022, Luis Chamberlain stated:

> On Wed, Nov 09, 2022 at 01:41:27PM +0000, Nick Alcock wrote:
>> This emits a new file, .tmp_vmlinux.ranges, which maps address
>> range/size pairs in vmlinux to the object files which make them up,
>> e.g., in part:
>> 
>> 0x0000000000000000 0x30 arch/x86/kernel/cpu/common.o
>> 0x0000000000001000 0x1000 arch/x86/events/intel/ds.o
>> 0x0000000000002000 0x4000 arch/x86/kernel/irq_64.o
>> 0x0000000000006000 0x5000 arch/x86/kernel/process.o
>> 0x000000000000b000 0x1000 arch/x86/kernel/cpu/common.o
>> 0x000000000000c000 0x5000 arch/x86/mm/cpu_entry_area.o
>> 0x0000000000011000 0x10 arch/x86/kernel/espfix_64.o
>> 0x0000000000011010 0x2 arch/x86/kernel/cpu/common.o
>> [...]
>
> This does't say why we'd want this. So either you merge it with its
> first user or you explain here why anyone might find this useful.

Uh... the first user is later in this patch series? If you want each
commit to have a self-contained explanation, I could certainly note why
it's useful for said first user in this commit message (and adjust other
messages similarly), but I had previous complaints that commit log
messages and the cover letter were repeating points, so I was trying to
reduce that kind of thing.

-- 
NULL && (void)