linux-kernel - Re: [PATCH] powerpc: Handle .text.{hot,unlikely}.* in linker script

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Message-ID: <20210104205732.GA1398664@ubuntu-m3-large-x86>
Date:   Mon, 4 Jan 2021 13:57:32 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Sedat Dilek <sedat.dilek@...il.com>
Cc:     Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Clang-Built-Linux ML <clang-built-linux@...glegroups.com>,
        stable@...r.kernel.org
Subject: Re: [PATCH] powerpc: Handle .text.{hot,unlikely}.* in linker script

On Mon, Jan 04, 2021 at 09:55:20PM +0100, Sedat Dilek wrote:
> On Mon, Jan 4, 2021 at 9:49 PM Nathan Chancellor
> <natechancellor@...il.com> wrote:
> >
> > Commit eff8728fe698 ("vmlinux.lds.h: Add PGO and AutoFDO input
> > sections") added ".text.unlikely.*" and ".text.hot.*" due to an LLVM
> > change [1].
> >
> > After another LLVM change [2], these sections are seen in some PowerPC
> > builds, where there is a orphan section warning then build failure:
> >
> 
> Looks like you forgot to add your references/links to [1] and [2].

Indeed, thank you for pointing that out! v2 coming shortly.

> Might be good to mention...?
> 
> With CONFIG_LD_ORPHAN_WARN=y is enabled

Since this symbol is not user selectable, I do not really think it is
worth mentioning, plus PowerPC has had this enabled for a while :)

Cheers,
Nathan