linux-kernel - Re: [PATCH 2/2] recordmcount: Handle sections with no non-weak symbols

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Message-ID: <819939e3-285b-2a65-9c4c-85640d2a3a02@csgroup.eu>
Date:   Mon, 2 May 2022 14:44:56 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Steven Rostedt <rostedt@...dmis.org>,
        "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
CC:     "llvm@...ts.linux.dev" <llvm@...ts.linux.dev>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH 2/2] recordmcount: Handle sections with no non-weak
 symbols



Le 28/04/2022 à 16:06, Steven Rostedt a écrit :
> On Thu, 28 Apr 2022 13:15:22 +0530
> "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com> wrote:
> 
>> Indeed, plain old -pg will be a problem. I'm not sure there is a generic
>> way to address this. I suppose architectures will have to validate the
>> mcount locations, something like this?
> 
> Perhaps another solution is to make the mcount locations after the linking
> is done. The main downside to that is that it takes time to go over the
> entire vmlinux, and will slow down a compile that only modified a couple of
> files.
> 

If we do that after the linking, won't it be a nightmare with the 
trampolines installed by the linker when the destination is over the 24 
bits limit ?

Christophe