linux-kernel - Re: [PATCH 1/3] powerpc/vmlinux.lds: Define RUNTIME_DISCARD

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Date:   Sun, 08 Jan 2023 23:49:55 +1100
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     linuxppc-dev@...ts.ozlabs.org,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     linux-kernel@...r.kernel.org, ardb@...nel.org,
        masahiroy@...nel.org, schwab@...ux-m68k.org,
        linux-arch@...r.kernel.org, nathan@...nel.org
Subject: Re: [PATCH 1/3] powerpc/vmlinux.lds: Define RUNTIME_DISCARD_EXIT

On Fri, 6 Jan 2023 00:23:47 +1100, Michael Ellerman wrote:
> The powerpc linker script explicitly includes .exit.text, because
> otherwise the link fails due to references from __bug_table and
> __ex_table. The code is freed (discarded) at runtime along with
> .init.text and data.
> 
> That has worked in the past despite powerpc not defining
> RUNTIME_DISCARD_EXIT because DISCARDS appears late in the powerpc linker
> script (line 410), and the explicit inclusion of .exit.text
> earlier (line 280) supersedes the discard.
> 
> [...]

Applied to powerpc/fixes.

[1/3] powerpc/vmlinux.lds: Define RUNTIME_DISCARD_EXIT
      https://git.kernel.org/powerpc/c/4b9880dbf3bdba3a7c56445137c3d0e30aaa0a40
[2/3] powerpc/vmlinux.lds: Don't discard .rela* for relocatable builds
      https://git.kernel.org/powerpc/c/07b050f9290ee012a407a0f64151db902a1520f5
[3/3] powerpc/vmlinux.lds: Don't discard .comment
      https://git.kernel.org/powerpc/c/be5f95c8779e19779dd81927c8574fec5aaba36c

cheers