linux-kernel - [PATCH 24/32] softirq: Uninline !CONFIG_TRACE_IRQFLAGS __local_bh_disable

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Date:   Tue, 12 Feb 2019 18:14:15 +0100
From:   Frederic Weisbecker <frederic@...nel.org>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Frederic Weisbecker <frederic@...nel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Mauro Carvalho Chehab <mchehab@...pensource.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "David S . Miller" <davem@...emloft.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
        Frederic Weisbecker <fweisbec@...il.com>,
        Pavan Kondeti <pkondeti@...eaurora.org>,
        Ingo Molnar <mingo@...nel.org>,
        Joel Fernandes <joel@...lfernandes.org>
Subject: [PATCH 24/32] softirq: Uninline !CONFIG_TRACE_IRQFLAGS __local_bh_disable_ip()

The common code between both versions of __local_bh_disable_ip(), whether
CONFIG_TRACE_IRQFLAGS is on or off, is going to grow up in order to
support vector masking granularity.

Merge these versions together to prepare for that.

Signed-off-by: Frederic Weisbecker <frederic@...nel.org>
Cc: Mauro Carvalho Chehab <mchehab@...pensource.com>
Cc: Joel Fernandes <joel@...lfernandes.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Pavan Kondeti <pkondeti@...eaurora.org>
Cc: Paul E . McKenney <paulmck@...ux.vnet.ibm.com>
Cc: David S . Miller <davem@...emloft.net>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
---
 include/linux/bottom_half.h | 10 ----------
 kernel/softirq.c            | 10 ++++++----
 2 files changed, 6 insertions(+), 14 deletions(-)

diff --git a/include/linux/bottom_half.h b/include/linux/bottom_half.h
index 240419382978..ef9e4c752f56 100644
--- a/include/linux/bottom_half.h
+++ b/include/linux/bottom_half.h
@@ -28,17 +28,7 @@ enum
 
 #define SOFTIRQ_DATA_INIT (SOFTIRQ_ALL_MASK << SOFTIRQ_ENABLED_SHIFT)
 
-
-
-#ifdef CONFIG_TRACE_IRQFLAGS
 extern void __local_bh_disable_ip(unsigned long ip, unsigned int cnt);
-#else
-static __always_inline void __local_bh_disable_ip(unsigned long ip, unsigned int cnt)
-{
-	preempt_count_add(cnt);
-	barrier();
-}
-#endif
 
 static inline void local_bh_disable(void)
 {
diff --git a/kernel/softirq.c b/kernel/softirq.c
index 5fea9e299caf..91dee716e139 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -102,14 +102,14 @@ static bool ksoftirqd_running(unsigned long pending)
  * softirq and whether we just have bh disabled.
  */
 
-#ifdef CONFIG_TRACE_IRQFLAGS
 void __local_bh_disable_ip(unsigned long ip, unsigned int cnt)
 {
+#ifdef CONFIG_TRACE_IRQFLAGS
 	unsigned long flags;
 
-	WARN_ON_ONCE(in_irq());
-
 	raw_local_irq_save(flags);
+#endif
+	WARN_ON_ONCE(in_irq());
 	/*
 	 * The preempt tracer hooks into preempt_count_add and will break
 	 * lockdep because it calls back into lockdep after SOFTIRQ_OFFSET
@@ -123,7 +123,10 @@ void __local_bh_disable_ip(unsigned long ip, unsigned int cnt)
 	 */
 	if (softirq_count() == (cnt & SOFTIRQ_MASK))
 		trace_softirqs_off(ip);
+
+#ifdef CONFIG_TRACE_IRQFLAGS
 	raw_local_irq_restore(flags);
+#endif
 
 	if (preempt_count() == cnt) {
 #ifdef CONFIG_DEBUG_PREEMPT
@@ -133,7 +136,6 @@ void __local_bh_disable_ip(unsigned long ip, unsigned int cnt)
 	}
 }
 EXPORT_SYMBOL(__local_bh_disable_ip);
-#endif /* CONFIG_TRACE_IRQFLAGS */
 
 static void __local_bh_enable_no_softirq(unsigned int cnt)
 {
-- 
2.17.1