linux-kernel - [RFC PATCH 0/1] zboot: Garbage collect unused functions

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Message-Id: <20230621114439.42851-1-alexghiti@rivosinc.com>
Date:   Wed, 21 Jun 2023 13:44:38 +0200
From:   Alexandre Ghiti <alexghiti@...osinc.com>
To:     Ard Biesheuvel <ardb@...nel.org>, linux-kernel@...r.kernel.org,
        linux-efi@...r.kernel.org
Cc:     Alexandre Ghiti <alexghiti@...osinc.com>
Subject: [RFC PATCH 0/1] zboot: Garbage collect unused functions

This patch is meant to solve the issue reported by lkp in [1] with the KASLR
series support for RISC-V.

The problem in [1] is caused by the addition of new functions in
efi-stub-helper.c which reference symbols that are not defined in the context
of zboot. Those functions are not used in zboot but it causes those link
errors.

I can move those new functions around so that the problem disappears, but I
believe that fixing that using the linker garbage collection is more sane.

That's an RFC, I'll include it in my KASLR series if that's the right
direction.

[1] https://lore.kernel.org/oe-kbuild-all/202306080741.ArdxyO6n-lkp@intel.com/

Alexandre Ghiti (1):
  libstub: zboot: Use -ffunction-sections + --gc-sections

 drivers/firmware/efi/libstub/Makefile       | 1 +
 drivers/firmware/efi/libstub/Makefile.zboot | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

-- 
2.39.2