linux-kernel - Re: CBL issue #431: lld: x86_64: sysfs: cannot create duplicate filename $module/.rodata.cst{16,32}

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Message-ID: <CA+icZUXHx8WXQeZkoCf9cwgdXXZE8AqrFLOvtZMaf8nzGLTMaw@mail.gmail.com>
Date:   Mon, 8 Apr 2019 17:16:47 +0200
From:   Sedat Dilek <sedat.dilek@...il.com>
To:     Denys Vlasenko <dvlasenk@...hat.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org
Subject: Re: CBL issue #431: lld: x86_64: sysfs: cannot create duplicate
 filename $module/.rodata.cst{16,32}

On Mon, Apr 8, 2019 at 5:04 PM Denys Vlasenko <dvlasenk@...hat.com> wrote:
>
> On 4/8/19 4:57 PM, Sedat Dilek wrote:
> > We have arch/x86/crypto/chacha-avx2-x86_64.S and
> > arch/x86/crypto/chacha-avx512vl-x86_64.S:
> >
> > .rodata.cst32.CTR2BL
> > .rodata.cst32.CTR4BL
> > .rodata.cst32.CTR2BL
> > .rodata.cst32.CTR4BL
> >
> > ...and in arch/x86/crypto/sha256-avx2-asm.S and
> > arch/x86/crypto/sha512-avx2-asm.S:
> >
> > .rodata.cst32.PSHUFFLE_BYTE_FLIP_MASK
> >
> > Correct?
>
> You mean, we have duplicate section names.
>
> Well, this brings me to my initial response -
> "Not sure how exactly this causes the error".
>
> Duplicate section names are allowed by the linker.
> There is nothing wrong with that.
>
> The warnings you see come from some other tooling,
> which does not handle correctly object files with more
> than one section with the same name.
>
> (Having unique names is still preferable,
> it helps humans to more easily find where sections come from,
> and for potential future --gc-sections optimization).

LLD offers these options:

  --check-sections        Check section addresses for overlaps (default)

  --ignore-data-address-equality
                          lld can break the address equality of data

  --ignore-function-address-equality
                          lld can break the address equality of functions

- Sedat -