linux-kernel - [patch V6 06/37] genirq: Provde __irq_enter/exit

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Date:   Sat, 16 May 2020 01:45:53 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, "Paul E. McKenney" <paulmck@...nel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Alexandre Chartre <alexandre.chartre@...cle.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Brian Gerst <brgerst@...il.com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Will Deacon <will@...nel.org>,
        Tom Lendacky <thomas.lendacky@....com>,
        Wei Liu <wei.liu@...nel.org>,
        Michael Kelley <mikelley@...rosoft.com>,
        Jason Chen CJ <jason.cj.chen@...el.com>,
        Zhao Yakui <yakui.zhao@...el.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>
Subject: [patch V6 06/37] genirq: Provde __irq_enter/exit_raw()


Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

diff --git a/include/linux/hardirq.h b/include/linux/hardirq.h
index f6f25fab34cb..adfd98b8a468 100644
--- a/include/linux/hardirq.h
+++ b/include/linux/hardirq.h
@@ -41,6 +41,17 @@ extern void rcu_nmi_exit(void);
 	} while (0)
 
 /*
+ * Like __irq_enter() without time accounting for fast
+ * interrupts, e.g. reschedule IPI where time accounting
+ * is more expensive than the actual interrupt.
+ */
+#define __irq_enter_raw()				\
+	do {						\
+		preempt_count_add(HARDIRQ_OFFSET);	\
+		lockdep_hardirq_enter();		\
+	} while (0)
+
+/*
  * Enter irq context (on NO_HZ, update jiffies):
  */
 void irq_enter(void);
@@ -60,6 +71,15 @@ void irq_enter_rcu(void);
 	} while (0)
 
 /*
+ * Like __irq_exit() without time accounting
+ */
+#define __irq_exit_raw()				\
+	do {						\
+		lockdep_hardirq_exit();			\
+		preempt_count_sub(HARDIRQ_OFFSET);	\
+	} while (0)
+
+/*
  * Exit irq context and process softirqs if needed:
  */
 void irq_exit(void);