linux-kernel - [patch V5 20/38] x86/irq/64: Provide handle

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Date:   Tue, 12 May 2020 23:01:19 +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 V5 20/38] x86/irq/64: Provide handle_irq()

To consolidate the interrupt entry/exit code vs. the other exceptions
provide handle_irq() (similar to 32bit) to move the interrupt stack
switching to C code. That allows to consolidate the entry exit handling by
reusing the idtentry machinery both in ASM and C.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
V5: Use the reworked ASM switcheroo
---
 arch/x86/kernel/irq_64.c |    8 ++++++++
 1 file changed, 8 insertions(+)

--- a/arch/x86/kernel/irq_64.c
+++ b/arch/x86/kernel/irq_64.c
@@ -79,3 +79,11 @@ void do_softirq_own_stack(void)
 	else
 		run_on_irqstack(__do_softirq, NULL);
 }
+
+void handle_irq(struct irq_desc *desc, struct pt_regs *regs)
+{
+	if (!irq_needs_irq_stack(regs))
+		generic_handle_irq_desc(desc);
+	else
+		run_on_irqstack(desc->handle_irq, desc);
+}