linux-kernel - [PATCH v2 08/17] irq: arc: avoid CONFIG_HANDLE_DOMAIN

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Date:   Tue, 26 Oct 2021 10:24:55 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     linux-kernel@...r.kernel.org
Cc:     aou@...s.berkeley.edu, catalin.marinas@....com,
        deanbo422@...il.com, green.hu@...il.com, guoren@...nel.org,
        jonas@...thpole.se, kernelfans@...il.com,
        linux-arm-kernel@...ts.infradead.org, linux@...linux.org.uk,
        mark.rutland@....com, maz@...nel.org, nickhu@...estech.com,
        palmer@...belt.com, paul.walmsley@...ive.com, shorne@...il.com,
        stefan.kristiansson@...nalahti.fi, tglx@...utronix.de,
        tsbogend@...ha.franken.de, vgupta@...nel.org,
        vladimir.murzin@....com, will@...nel.org
Subject: [PATCH v2 08/17] irq: arc: avoid CONFIG_HANDLE_DOMAIN_IRQ

In preparation for removing HANDLE_DOMAIN_IRQ, have arch/arc perform all
the necessary IRQ entry accounting in its entry code.

There should be no functional change as a result of this patch.

Signed-off-by: Mark Rutland <mark.rutland@....com>
Reviewed-by: Marc Zyngier <maz@...nel.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Vineet Gupta <vgupta@...nel.org>
---
 arch/arc/Kconfig      |  1 -
 arch/arc/kernel/irq.c | 10 +++++++++-
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index 3a5a80f302e1..b4ae6058902a 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -40,7 +40,6 @@ config ARC
 	select HAVE_KRETPROBES
 	select HAVE_MOD_ARCH_SPECIFIC
 	select HAVE_PERF_EVENTS
-	select HANDLE_DOMAIN_IRQ
 	select IRQ_DOMAIN
 	select MODULES_USE_ELF_RELA
 	select OF
diff --git a/arch/arc/kernel/irq.c b/arch/arc/kernel/irq.c
index ef909dd4b40c..dd09b58ff82d 100644
--- a/arch/arc/kernel/irq.c
+++ b/arch/arc/kernel/irq.c
@@ -6,6 +6,8 @@
 #include <linux/interrupt.h>
 #include <linux/irqchip.h>
 #include <asm/mach_desc.h>
+
+#include <asm/irq_regs.h>
 #include <asm/smp.h>
 
 /*
@@ -39,5 +41,11 @@ void __init init_IRQ(void)
  */
 void arch_do_IRQ(unsigned int hwirq, struct pt_regs *regs)
 {
-	handle_domain_irq(NULL, hwirq, regs);
+	struct pt_regs *old_regs;
+
+	irq_enter();
+	old_regs = set_irq_regs(regs);
+	generic_handle_domain_irq(NULL, hwirq);
+	set_irq_regs(old_regs);
+	irq_exit();
 }
-- 
2.11.0