linux-kernel - Re: [PATCH] kexec_file: Drop weak attribute from arch_kexec_apply_relocations[

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Date:   Thu, 26 May 2022 16:30:22 +0530
From:   "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     Baoquan He <bhe@...hat.com>, kexec@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        Michael Ellerman <mpe@...erman.id.au>
Subject: Re: [PATCH] kexec_file: Drop weak attribute from
 arch_kexec_apply_relocations[_add]

Andrew Morton wrote:
> On Fri, 20 May 2022 14:25:05 -0500 "Eric W. Biederman" <ebiederm@...ssion.com> wrote:
> 
>> > I am not strongly against taking off __weak, just wondering if there's
>> > chance to fix it in recordmcount, and the cost comparing with kernel fix;
>> > except of this issue, any other weakness of __weak. Noticed Andrew has
>> > picked this patch, as a witness of this moment, raise a tiny concern.
>> 
>> I just don't see what else we can realistically do.
> 
> I think converting all of the kexec __weaks to use the ifdef approach
> makes sense, if only because kexec is now using two different styles.
> 
> But for now, I'll send Naveen's v2 patch in to Linus to get us out of
> trouble.

Thanks!

> 
> I'm thinking that we should add cc:stable to that patch as well, to
> reduce the amount of problems which people experience when using newer
> binutils on older kernels?

Yes, please. I missed tagging this for stable. It looks like this is 
applicable all the way back to v4.9 (though I haven't tested if 
recordmcount fails in the same manner with those older kernel levels). I 
will post backports once this gets into linus' tree.


- Naveen