linux-kernel - [PATCH 12/46] x86/paravirt, lto: Mark native_steal_clock() as __visible_on

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Date:   Mon, 14 Nov 2022 12:43:10 +0100
From:   "Jiri Slaby (SUSE)" <jirislaby@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     Andi Kleen <ak@...ux.intel.com>, Juergen Gross <jgross@...e.com>,
        Alexey Makhalov <amakhalov@...are.com>,
        VMware PV-Drivers Reviewers <pv-drivers@...are.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Martin Liska <mliska@...e.cz>, Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 12/46] x86/paravirt, lto: Mark native_steal_clock() as __visible_on_lto

From: Andi Kleen <ak@...ux.intel.com>

Symbols referenced from assembler (either directly or e.f. from
DEFINE_STATIC_KEY()) need to be global and visible in gcc LTO because
they could end up in a different object file than the assembler. This
can lead to linker errors without this patch.

So mark native_steal_clock() as __visible_on_lto.

[js] use __visible_on_lto

Cc: Juergen Gross <jgross@...e.com>
Cc: "Srivatsa S. Bhat
Cc: Alexey Makhalov <amakhalov@...are.com>
Cc: VMware PV-Drivers Reviewers <pv-drivers@...are.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: x86@...nel.org
Signed-off-by: Andi Kleen <ak@...ux.intel.com>
Signed-off-by: Martin Liska <mliska@...e.cz>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 arch/x86/kernel/paravirt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c
index 7ca2d46c08cc..27a537cd4b0e 100644
--- a/arch/x86/kernel/paravirt.c
+++ b/arch/x86/kernel/paravirt.c
@@ -120,7 +120,7 @@ unsigned int paravirt_patch(u8 type, void *insn_buff, unsigned long addr,
 struct static_key paravirt_steal_enabled;
 struct static_key paravirt_steal_rq_enabled;
 
-static u64 native_steal_clock(int cpu)
+__visible_on_lto u64 native_steal_clock(int cpu)
 {
 	return 0;
 }
-- 
2.38.1