linux-kernel - [PATCH 20/46] softirq, lto: Mark irq_enter/exit_rcu() as _

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Date:   Mon, 14 Nov 2022 12:43:18 +0100
From:   "Jiri Slaby (SUSE)" <jirislaby@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     Andi Kleen <andi@...stfloor.org>, Martin Liska <mliska@...e.cz>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 20/46] softirq, lto: Mark irq_enter/exit_rcu() as __visible

From: Andi Kleen <andi@...stfloor.org>

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 irq_enter_rcu() and irq_exit_rcu() as __visible.

Signed-off-by: Andi Kleen <andi@...stfloor.org>
Signed-off-by: Martin Liska <mliska@...e.cz>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 kernel/softirq.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/softirq.c b/kernel/softirq.c
index c8a6913c067d..9d62e09c9581 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -604,7 +604,7 @@ asmlinkage __visible void __softirq_entry __do_softirq(void)
 /**
  * irq_enter_rcu - Enter an interrupt context with RCU watching
  */
-void irq_enter_rcu(void)
+__visible void irq_enter_rcu(void)
 {
 	__irq_enter_raw();
 
@@ -657,7 +657,7 @@ static inline void __irq_exit_rcu(void)
  *
  * Also processes softirqs if needed and possible.
  */
-void irq_exit_rcu(void)
+__visible void irq_exit_rcu(void)
 {
 	__irq_exit_rcu();
 	 /* must be last! */
-- 
2.38.1