linux-kernel - Re: [PATCH] gendwarfksyms: define __GENKSYMS_

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Message-ID: <CAMj1kXE1jVp+3aoyWEKNUOg3VWJ14xtyFGE0n3-UScEPA402Jg@mail.gmail.com>
Date: Thu, 20 Mar 2025 15:45:13 +0100
From: Ard Biesheuvel <ardb@...nel.org>
To: Masahiro Yamada <masahiroy@...nel.org>
Cc: Ard Biesheuvel <ardb+git@...gle.com>, linux-kbuild@...r.kernel.org, brgerst@...il.com, 
	x86@...nel.org, nathan@...nel.org, linux-kernel@...r.kernel.org, 
	nogikh@...gle.com, Sami Tolvanen <samitolvanen@...gle.com>, 
	syzbot+06fd1a3613c50d36129e@...kaller.appspotmail.com
Subject: Re: [PATCH] gendwarfksyms: define __GENKSYMS__ when processing asm-protoypes.h

On Thu, 20 Mar 2025 at 15:40, Masahiro Yamada <masahiroy@...nel.org> wrote:
>
> On Thu, Mar 20, 2025 at 4:08 PM Ard Biesheuvel <ardb+git@...gle.com> wrote:
> >
> > From: Ard Biesheuvel <ardb@...nel.org>
> >
> > Ensure that __GENKSYMS__ is #define'd when passing asm/asm-prototypes.h
> > through the compiler to capture the exported symbols. This ensures that
> > exported symbols such as __ref_stack_chk_guard on x86, which is declared
> > conditionally, is visible to the tool.
>
>
> Why don't you make it unconditional, then?
>

Because this symbol is being hidden from the compiler.

Commit 577c134d311b9b has the details.