linux-kernel - Re: [PATCH] x86/stackprotector: fix build failure with CONFIG

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Message-ID: <20250311214159.GH3493@redhat.com>
Date: Tue, 11 Mar 2025 22:42:01 +0100
From: Oleg Nesterov <oleg@...hat.com>
To: Brian Gerst <brgerst@...il.com>
Cc: Borislav Petkov <bp@...en8.de>, Ard Biesheuvel <ardb@...nel.org>,
	linux-kernel@...r.kernel.org, x86@...nel.org,
	Ingo Molnar <mingo@...nel.org>, "H . Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Uros Bizjak <ubizjak@...il.com>, stable@...r.kernel.org,
	Fangrui Song <i@...kray.me>, Nathan Chancellor <nathan@...nel.org>,
	Andy Lutomirski <luto@...nel.org>
Subject: Re: [PATCH] x86/stackprotector: fix build failure with
 CONFIG_STACKPROTECTOR=n

On 03/11, Brian Gerst wrote:
>
> On Tue, Mar 11, 2025 at 3:24 PM Oleg Nesterov <oleg@...hat.com> wrote:
> >
> > OK. I'll update the subject/changelog to explain that this is only
> > needed for the older binutils and send V2.
>
> With it conditional on CONFIG_STACKPROTECTOR, you can also drop PROVIDES().

Sorry Brian, I don't understand this magic even remotely...

Do you mean

	-/* needed for Clang - see arch/x86/entry/entry.S */
	-PROVIDE(__ref_stack_chk_guard = __stack_chk_guard);
	+#ifdef CONFIG_STACKPROTECTOR
	+__ref_stack_chk_guard = __stack_chk_guard;
	+#endif

?

Oleg.