linux-kernel - [PATCH 18/46] entry, lto: Mark raw_irqentry_exit_cond_resched() as _

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Message-Id: <20221114114344.18650-19-jirislaby@kernel.org>
Date:   Mon, 14 Nov 2022 12:43:16 +0100
From:   "Jiri Slaby (SUSE)" <jirislaby@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     Andi Kleen <ak@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Martin Liska <mliska@...e.cz>, Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 18/46] entry, lto: Mark raw_irqentry_exit_cond_resched() as __visible

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 raw_irqentry_exit_cond_resched() as __visible.

Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Andy Lutomirski <luto@...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>
---
 kernel/entry/common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/entry/common.c b/kernel/entry/common.c
index 846add8394c4..13c1a7a0e8ce 100644
--- a/kernel/entry/common.c
+++ b/kernel/entry/common.c
@@ -378,7 +378,7 @@ noinstr irqentry_state_t irqentry_enter(struct pt_regs *regs)
 	return ret;
 }
 
-void raw_irqentry_exit_cond_resched(void)
+__visible void raw_irqentry_exit_cond_resched(void)
 {
 	if (!preempt_count()) {
 		/* Sanity check RCU and thread stack */
-- 
2.38.1