linux-kernel - [PATCH 19/32] softirq: Rename _local_bh_enable() to local_bh_enable_no

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Message-Id: <20190212171423.8308-20-frederic@kernel.org>
Date:   Tue, 12 Feb 2019 18:14:10 +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 19/32] softirq: Rename _local_bh_enable() to local_bh_enable_no_softirq()

The bottom half masking APIs have become interestingly confusing with all
these flavours:

		local_bh_enable()
		_local_bh_enable()
		local_bh_enable_ip()
		__local_bh_enable_ip()

_local_bh_enable() is an exception here because it's the only version
that won't execute do_softirq() in the end.

Clarify this straight in the name. It may help reviewers who are already
familiar with functions such as preempt_enable_no_resched().

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>
---
 arch/s390/lib/delay.c       |  2 +-
 drivers/s390/char/sclp.c    |  2 +-
 drivers/s390/cio/cio.c      |  2 +-
 include/linux/bottom_half.h |  2 +-
 kernel/softirq.c            | 12 ++++++------
 5 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/arch/s390/lib/delay.c b/arch/s390/lib/delay.c
index d4aa10795605..3f83ee9446b7 100644
--- a/arch/s390/lib/delay.c
+++ b/arch/s390/lib/delay.c
@@ -91,7 +91,7 @@ void __udelay(unsigned long long usecs)
 	if (raw_irqs_disabled_flags(flags)) {
 		local_bh_disable();
 		__udelay_disabled(usecs);
-		_local_bh_enable();
+		local_bh_enable_no_softirq();
 		goto out;
 	}
 	__udelay_enabled(usecs);
diff --git a/drivers/s390/char/sclp.c b/drivers/s390/char/sclp.c
index e9aa71cdfc44..6c6b7456b368 100644
--- a/drivers/s390/char/sclp.c
+++ b/drivers/s390/char/sclp.c
@@ -572,7 +572,7 @@ sclp_sync_wait(void)
 	local_irq_disable();
 	__ctl_load(cr0, 0, 0);
 	if (!irq_context)
-		_local_bh_enable();
+		local_bh_enable_no_softirq();
 	local_tick_enable(old_tick);
 	local_irq_restore(flags);
 }
diff --git a/drivers/s390/cio/cio.c b/drivers/s390/cio/cio.c
index de744ca158fd..e3fb83b3c6c1 100644
--- a/drivers/s390/cio/cio.c
+++ b/drivers/s390/cio/cio.c
@@ -607,7 +607,7 @@ void cio_tsch(struct subchannel *sch)
 		inc_irq_stat(IRQIO_CIO);
 	if (!irq_context) {
 		irq_exit();
-		_local_bh_enable();
+		local_bh_enable_no_softirq();
 	}
 }
 
diff --git a/include/linux/bottom_half.h b/include/linux/bottom_half.h
index a19519f4241d..a104f815efcf 100644
--- a/include/linux/bottom_half.h
+++ b/include/linux/bottom_half.h
@@ -19,7 +19,7 @@ static inline void local_bh_disable(void)
 	__local_bh_disable_ip(_THIS_IP_, SOFTIRQ_DISABLE_OFFSET);
 }
 
-extern void _local_bh_enable(void);
+extern void local_bh_enable_no_softirq(void);
 extern void __local_bh_enable_ip(unsigned long ip, unsigned int cnt);
 
 static inline void local_bh_enable_ip(unsigned long ip)
diff --git a/kernel/softirq.c b/kernel/softirq.c
index 5f167fc43ab9..d305b4c8d1a7 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -139,7 +139,7 @@ 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(unsigned int cnt)
+static void __local_bh_enable_no_softirq(unsigned int cnt)
 {
 	lockdep_assert_irqs_disabled();
 
@@ -156,12 +156,12 @@ static void __local_bh_enable(unsigned int cnt)
  * Special-case - softirqs can safely be enabled by __do_softirq(),
  * without processing still-pending softirqs:
  */
-void _local_bh_enable(void)
+void local_bh_enable_no_softirq(void)
 {
 	WARN_ON_ONCE(in_irq());
-	__local_bh_enable(SOFTIRQ_DISABLE_OFFSET);
+	__local_bh_enable_no_softirq(SOFTIRQ_DISABLE_OFFSET);
 }
-EXPORT_SYMBOL(_local_bh_enable);
+EXPORT_SYMBOL(local_bh_enable_no_softirq);
 
 void __local_bh_enable_ip(unsigned long ip, unsigned int cnt)
 {
@@ -316,7 +316,7 @@ asmlinkage __visible void __softirq_entry __do_softirq(void)
 
 	lockdep_softirq_end(in_hardirq);
 	account_irq_exit_time(current);
-	__local_bh_enable(SOFTIRQ_OFFSET);
+	__local_bh_enable_no_softirq(SOFTIRQ_OFFSET);
 	WARN_ON_ONCE(in_interrupt());
 	current_restore_flags(old_flags, PF_MEMALLOC);
 }
@@ -352,7 +352,7 @@ void irq_enter(void)
 		 */
 		local_bh_disable();
 		tick_irq_enter();
-		_local_bh_enable();
+		local_bh_enable_no_softirq();
 	}
 
 	__irq_enter();
-- 
2.17.1