From: Frederic Weisbecker <frederic@kernel.org>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Frederic Weisbecker <frederic@kernel.org>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
Peter Zijlstra <peterz@infradead.org>,
"David S . Miller" <davem@davemloft.net>,
Linus Torvalds <torvalds@linux-foundation.org>,
Thomas Gleixner <tglx@linutronix.de>,
"Paul E . McKenney" <paulmck@linux.vnet.ibm.com>,
Ingo Molnar <mingo@kernel.org>,
Frederic Weisbecker <fweisbec@gmail.com>,
Mauro Carvalho Chehab <mchehab@s-opensource.com>
Subject: [RFC PATCH 14/30] softirq: Introduce local_bh_disable_all()
Date: Thu, 11 Oct 2018 01:12:01 +0200 [thread overview]
Message-ID: <1539213137-13953-15-git-send-email-frederic@kernel.org> (raw)
In-Reply-To: <1539213137-13953-1-git-send-email-frederic@kernel.org>
As we plan to narrow down local_bh_disable() to a per-vector disablement
granularity, a shortcut can be handy for code that want to disable all
of them and not care about carrying the bh enabled mask state prior to
the call.
(TODO: check that it is called while bh are ALL enabled because
local_bh_enable_all() is going to re-enable ALL of them. Pretty much like
there should be no local_irq_enable() between a pair or local_irq_save()
and local_irq_restore()).
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: David S. Miller <davem@davemloft.net>
Cc: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
---
include/linux/bottom_half.h | 3 +++
kernel/softirq.c | 10 ++++++++++
2 files changed, 13 insertions(+)
diff --git a/include/linux/bottom_half.h b/include/linux/bottom_half.h
index fd75d1a..192a71c 100644
--- a/include/linux/bottom_half.h
+++ b/include/linux/bottom_half.h
@@ -64,4 +64,7 @@ static inline void local_bh_enable(void)
__local_bh_enable_ip(_THIS_IP_, SOFTIRQ_DISABLE_OFFSET);
}
+extern void local_bh_disable_all(void);
+extern void local_bh_enable_all(void);
+
#endif /* _LINUX_BH_H */
diff --git a/kernel/softirq.c b/kernel/softirq.c
index 75aab25..730a5c9 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -197,6 +197,16 @@ void __local_bh_enable_ip(unsigned long ip, unsigned int cnt)
}
EXPORT_SYMBOL(__local_bh_enable_ip);
+void local_bh_disable_all(void)
+{
+ local_bh_disable();
+}
+
+void local_bh_enable_all(void)
+{
+ local_bh_enable();
+}
+
/*
* We restart softirq processing for at most MAX_SOFTIRQ_RESTART times,
* but break the loop if need_resched() is set or after 2 ms.
--
2.7.4
next prev parent reply other threads:[~2018-10-10 23:13 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-10 23:11 [RFC PATCH 00/30] softirq: Make softirqs soft-interruptible (+ per vector disablement) Frederic Weisbecker
2018-10-10 23:11 ` [RFC PATCH 01/30] x86: Revert "x86/irq: Demote irq_cpustat_t::__softirq_pending to u16" Frederic Weisbecker
2018-10-10 23:11 ` [RFC PATCH 02/30] arch/softirq: Rename softirq_pending fields to softirq_data Frederic Weisbecker
2018-10-10 23:11 ` [RFC PATCH 03/30] softirq: Implement local_softirq_pending() below softirq vector definition Frederic Weisbecker
2018-10-10 23:11 ` [RFC PATCH 04/30] softirq: Normalize softirq_pending naming scheme Frederic Weisbecker
2018-10-10 23:11 ` [RFC PATCH 05/30] softirq: Convert softirq_pending_set() to softirq_pending_nand() Frederic Weisbecker
2018-10-10 23:11 ` [RFC PATCH 06/30] softirq: Introduce disabled softirq vectors bits Frederic Weisbecker
2018-10-10 23:11 ` [RFC PATCH 07/30] softirq: Rename _local_bh_enable() to local_bh_enable_no_softirq() Frederic Weisbecker
2018-10-10 23:11 ` [RFC PATCH 08/30] softirq: Move vectors bits to bottom_half.h Frederic Weisbecker
2018-10-10 23:11 ` [RFC PATCH 09/30] x86: Init softirq enabled field Frederic Weisbecker
2018-10-10 23:11 ` [RFC PATCH 10/30] softirq: Check enabled bits on the softirq loop Frederic Weisbecker
2018-10-10 23:11 ` [RFC PATCH 11/30] net: Prepare netif_tx_lock_bh/netif_tx_unlock_bh() for handling softirq mask Frederic Weisbecker
2018-10-10 23:11 ` [RFC PATCH 12/30] rcu: Prepare rcu_read_[un]lock_bh() " Frederic Weisbecker
2018-10-16 5:28 ` Joel Fernandes
2018-10-17 0:44 ` Frederic Weisbecker
2018-10-17 0:55 ` Joel Fernandes
2018-10-10 23:12 ` [RFC PATCH 13/30] net: Prepare tcp_get_md5sig_pool() " Frederic Weisbecker
2018-10-10 23:12 ` Frederic Weisbecker [this message]
2018-10-10 23:12 ` [RFC PATCH 15/30] net: Prepare [un]lock_sock_fast() " Frederic Weisbecker
2018-10-10 23:12 ` [RFC PATCH 16/30] net: Prepare nf_log_buf_open() " Frederic Weisbecker
2018-10-10 23:12 ` [RFC PATCH 17/30] isdn: Prepare isdn_net_get_locked_lp() " Frederic Weisbecker
2018-10-10 23:12 ` [RFC PATCH 18/30] softirq: Prepare local_bh_disable() " Frederic Weisbecker
2018-10-10 23:12 ` [RFC PATCH 19/30] diva: Prepare diva_os_enter_spin_lock() " Frederic Weisbecker
2018-10-10 23:12 ` [RFC PATCH 20/30] tg3: Prepare tg3_full_[un]lock() " Frederic Weisbecker
2018-10-10 23:12 ` [RFC PATCH 21/30] locking: Prepare spin_lock_bh() " Frederic Weisbecker
2018-10-10 23:12 ` [RFC PATCH 22/30] seqlock: Prepare write_seq[un]lock_bh() " Frederic Weisbecker
2018-10-10 23:12 ` [RFC PATCH 23/30] rwlock: Prepare write_[un]lock_bh() " Frederic Weisbecker
2018-10-10 23:12 ` [RFC PATCH 24/30] softirq: Introduce Local_bh_enter/exit() Frederic Weisbecker
2018-10-10 23:12 ` [RFC PATCH 25/30] softirq: Push down softirq mask to __local_bh_disable_ip() Frederic Weisbecker
2018-10-10 23:12 ` [RFC PATCH 26/30] softirq: Increment the softirq offset on top of enabled bits Frederic Weisbecker
2018-10-10 23:12 ` [RFC PATCH 27/30] softirq: Swap softirq serving VS disable on preempt mask layout Frederic Weisbecker
2018-10-10 23:12 ` [RFC PATCH 28/30] softirq: Disable vector on execution Frederic Weisbecker
2018-10-10 23:12 ` [RFC PATCH 29/30] softirq: Make softirq processing softinterruptible Frederic Weisbecker
2018-10-16 4:15 ` Pavan Kondeti
2018-10-17 0:26 ` Frederic Weisbecker
2018-10-22 8:12 ` Pavan Kondeti
2018-10-10 23:12 ` [RFC PATCH 30/30] softirq: Tasklet/net-rx fixup Frederic Weisbecker
2018-10-16 22:03 ` [RFC PATCH 00/30] softirq: Make softirqs soft-interruptible (+ per vector disablement) Jonathan Corbet
2018-10-16 23:37 ` Richard Cochran
2018-10-17 1:20 ` Frederic Weisbecker
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