linux-kernel - Re: [PATCH -next] arm32: enable HAVE_LD_DEAD_CODE_DATA

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Message-Id: <76cf345f-2a7f-49cb-a31b-f9db1f23a615@app.fastmail.com>
Date: Thu, 07 Mar 2024 08:29:04 +0100
From: "Arnd Bergmann" <arnd@...db.de>
To: "Yuntao Liu" <liuyuntao12@...wei.com>,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc: "Russell King" <linux@...linux.org.uk>, "Andrew Davis" <afd@...com>,
 "Andrew Morton" <akpm@...ux-foundation.org>,
 "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
 "Geert Uytterhoeven" <geert+renesas@...der.be>,
 "Jonathan Corbet" <corbet@....net>, "Mike Rapoport" <rppt@...nel.org>,
 "Rob Herring" <robh@...nel.org>, "Thomas Gleixner" <tglx@...utronix.de>,
 "Linus Walleij" <linus.walleij@...aro.org>
Subject: Re: [PATCH -next] arm32: enable HAVE_LD_DEAD_CODE_DATA_ELIMINATION

On Thu, Mar 7, 2024, at 04:09, liuyuntao (F) wrote:
> On 2024/2/27 16:06, liuyuntao (F) wrote:
>> 
>> 
>> On 2024/2/23 0:04, Arnd Bergmann wrote:
>>> On Thu, Feb 22, 2024, at 12:24, liuyuntao (F) wrote:
>>>>
>>>> The position of the caret has been moved below the right brace
>>>> of { KEEP(*(.vectors.bhb.loop8)) }, indicating that lld is treating
>>>> the entire `KEEP(*(.vectors))` as a file name. This could potentially be
>>>> a bug in lld. Perhaps we can temporarily
>>>> enable the DCE option only when option LD_IS_LLD is disabled,
>>>> like risc-v:
>>>>
>>>> `select HAVE_LD_DEAD_CODE_DATA_ELIMINATION if !LD_IS_LLD`.
>>>
>>> I would really like to see this working with lld if at all
>>> possible, as it allows the combination of gc-sections with
>>> lto and CONFIG_TRIM_UNUSED_KSYMS.
>> 
> Another way to preserve .vector sections without using KEEP annotation.
> It boots well. How do you feel about this approach? and, could I submit 
> a v2 patch?

Yes, if that works, please submit it as v2, we'll see if anyone
has concerns about the new version then.

     Arnd