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Subject[PATCHv3 3/3] arm64/entry-common: supplement irq accounting
Date
At present, the irq entry/exit accounting, which is performed by
handle_domain_irq(), overlaps with arm64 exception entry code somehow.

By supplementing irq accounting on arm64 exception entry code, the
accounting in handle_domain_irq() can be dropped totally by selecting
the macro HAVE_ARCH_IRQENTRY.

Signed-off-by: Pingfan Liu <kernelfans@gmail.com>
Cc: "Paul E. McKenney" <paulmck@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Joey Gouly <joey.gouly@arm.com>
Cc: Sami Tolvanen <samitolvanen@google.com>
Cc: Julien Thierry <julien.thierry@arm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yuichi Ito <ito-yuichi@fujitsu.com>
Cc: linux-kernel@vger.kernel.org
To: linux-arm-kernel@lists.infradead.org
---
arch/arm64/Kconfig | 1 +
arch/arm64/kernel/entry-common.c | 4 ++++
2 files changed, 5 insertions(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 5c7ae4c3954b..d29bae38a951 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -98,6 +98,7 @@ config ARM64
select ARCH_HAS_UBSAN_SANITIZE_ALL
select ARM_AMBA
select ARM_ARCH_TIMER
+ select HAVE_ARCH_IRQENTRY
select ARM_GIC
select AUDIT_ARCH_COMPAT_GENERIC
select ARM_GIC_V2M if PCI
diff --git a/arch/arm64/kernel/entry-common.c b/arch/arm64/kernel/entry-common.c
index 5f1473319fb0..6d4dc3b3799f 100644
--- a/arch/arm64/kernel/entry-common.c
+++ b/arch/arm64/kernel/entry-common.c
@@ -428,7 +428,9 @@ static __always_inline void
__el1_interrupt(struct pt_regs *regs, void (*handler)(struct pt_regs *))
{
enter_from_kernel_mode(regs);
+ irq_enter_rcu();
do_interrupt_handler(regs, handler);
+ irq_exit_rcu();
/*
* Note: thread_info::preempt_count includes both thread_info::count
* and thread_info::need_resched, and is not equivalent to
@@ -667,7 +669,9 @@ static void noinstr el0_interrupt(struct pt_regs *regs,
if (regs->pc & BIT(55))
arm64_apply_bp_hardening();

+ irq_enter_rcu();
do_interrupt_handler(regs, handler);
+ irq_exit_rcu();

exit_to_user_mode(regs);
}
--
2.31.1
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