linux-kernel - [patch 11/12] softirq: Allow inlining do_softirq_own

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Date:   Thu, 04 Feb 2021 21:49:14 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, Josh Poimboeuf <jpoimboe@...hat.com>,
        Kees Cook <keescook@...omium.org>
Subject: [patch 11/12] softirq: Allow inlining do_softirq_own_stack()

The function to switch to the irq stack on x86 is now minimal and there is
only a single caller. Allow the stack switch to be inlined.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 include/linux/interrupt.h |    2 ++
 kernel/softirq.c          |    4 ++++
 2 files changed, 6 insertions(+)

--- a/include/linux/interrupt.h
+++ b/include/linux/interrupt.h
@@ -570,7 +570,9 @@ asmlinkage void do_softirq(void);
 asmlinkage void __do_softirq(void);
 
 #ifdef __ARCH_HAS_DO_SOFTIRQ
+# ifndef __ARCH_HAS_DO_SOFTIRQ_INLINE
 void do_softirq_own_stack(void);
+# endif
 #else
 static inline void do_softirq_own_stack(void)
 {
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -26,6 +26,10 @@
 #include <linux/tick.h>
 #include <linux/irq.h>
 
+#ifdef __ARCH_HAS_DO_SOFTIRQ_INLINE
+# include <asm/irq_stack.h>
+#endif
+
 #define CREATE_TRACE_POINTS
 #include <trace/events/irq.h>