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Message-Id: <20200505135828.499985727@linutronix.de>
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Date:   Tue, 05 May 2020 15:53:45 +0200
From:   Thomas Gleixner <tglx@linutronix.de>
To:     LKML <linux-kernel@vger.kernel.org>
Cc:     x86@kernel.org, "Paul E. McKenney" <paulmck@kernel.org>,
        Andy Lutomirski <luto@kernel.org>,
        Alexandre Chartre <alexandre.chartre@oracle.com>,
        Frederic Weisbecker <frederic@kernel.org>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Sean Christopherson <sean.j.christopherson@intel.com>,
        Masami Hiramatsu <mhiramat@kernel.org>,
        Petr Mladek <pmladek@suse.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        Joel Fernandes <joel@joelfernandes.org>,
        Boris Ostrovsky <boris.ostrovsky@oracle.com>,
        Juergen Gross <jgross@suse.com>,
        Brian Gerst <brgerst@gmail.com>,
        Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
        Josh Poimboeuf <jpoimboe@redhat.com>,
        Will Deacon <will@kernel.org>
Subject: [patch V4 part 5 04/31] x86/entry: Split idtentry_enter/exit()
References: <20200505135341.730586321@linutronix.de>
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Sender: linux-kernel-owner@vger.kernel.org
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Split the implementation of idtentry_enter/exit() out into inline functions
so that variaants of idtentry_enter/exit() can be implemented without
duplicating code.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 arch/x86/entry/common.c |   37 +++++++++++++++++++++----------------
 1 file changed, 21 insertions(+), 16 deletions(-)

--- a/arch/x86/entry/common.c
+++ b/arch/x86/entry/common.c
@@ -539,22 +539,7 @@ void noinstr idtentry_enter(struct pt_re
 	}
 }
 
-/**
- * idtentry_exit - Common code to handle return from exceptions
- * @regs:	Pointer to pt_regs (exception entry regs)
- *
- * Depending on the return target (kernel/user) this runs the necessary
- * preemption and work checks if possible and reguired and returns to
- * the caller with interrupts disabled and no further work pending.
- *
- * This is the last action before returning to the low level ASM code which
- * just needs to return to the appropriate context.
- *
- * Invoked by all exception/interrupt IDTENTRY handlers which are not
- * returning through the paranoid exit path (all except NMI, #DF and the IST
- * variants of #MC and #DB).
- */
-void noinstr idtentry_exit(struct pt_regs *regs)
+static __always_inline void __idtentry_exit(struct pt_regs *regs)
 {
 	lockdep_assert_irqs_disabled();
 
@@ -599,3 +584,23 @@ void noinstr idtentry_exit(struct pt_reg
 		rcu_irq_exit();
 	}
 }
+
+/**
+ * idtentry_exit - Common code to handle return from exceptions
+ * @regs:	Pointer to pt_regs (exception entry regs)
+ *
+ * Depending on the return target (kernel/user) this runs the necessary
+ * preemption and work checks if possible and reguired and returns to
+ * the caller with interrupts disabled and no further work pending.
+ *
+ * This is the last action before returning to the low level ASM code which
+ * just needs to return to the appropriate context.
+ *
+ * Invoked by all exception/interrupt IDTENTRY handlers which are not
+ * returning through the paranoid exit path (all except NMI, #DF and the IST
+ * variants of #MC and #DB).
+ */
+void noinstr idtentry_exit(struct pt_regs *regs)
+{
+	__idtentry_exit(regs);
+}