summaryrefslogtreecommitdiff
path: root/kernel/irq/handle.c
diff options
context:
space:
mode:
authorMark Rutland <mark.rutland@arm.com>2021-10-20 11:24:06 +0100
committerMark Rutland <mark.rutland@arm.com>2021-10-25 10:05:27 +0100
commita1b09501971435ef213251891753afb0d7f3d27a (patch)
treeeadab2b1aef05e291de205bca2f17cab67871f86 /kernel/irq/handle.c
parent76adc5be6f505d0c137b210a95ad00dbd089473d (diff)
irq: add generic_handle_arch_irq()
Several architectures select GENERIC_IRQ_MULTI_HANDLER and branch to handle_arch_irq() without performing any entry accounting. Add a generic wrapper to handle the common irqentry work when invoking handle_arch_irq(). Where an architecture needs to perform some entry accounting itself, it will need to invoke handle_arch_irq() itself. In subsequent patches it will become the responsibilty of the entry code to set the irq regs when entering an IRQ (rather than deferring this to an irqchip handler), so generic_handle_arch_irq() is made to set the irq regs now. This can be redundant in some cases, but is never harmful as saving/restoring the old regs nests safely. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Reviewed-by: Marc Zyngier <maz@kernel.org> Reviewed-by: Guo Ren <guoren@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/irq/handle.c')
-rw-r--r--kernel/irq/handle.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index 221d80c31e94..27182003b879 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -14,6 +14,8 @@
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>
+#include <asm/irq_regs.h>
+
#include <trace/events/irq.h>
#include "internals.h"
@@ -226,4 +228,20 @@ int __init set_handle_irq(void (*handle_irq)(struct pt_regs *))
handle_arch_irq = handle_irq;
return 0;
}
+
+/**
+ * generic_handle_arch_irq - root irq handler for architectures which do no
+ * entry accounting themselves
+ * @regs: Register file coming from the low-level handling code
+ */
+asmlinkage void noinstr generic_handle_arch_irq(struct pt_regs *regs)
+{
+ struct pt_regs *old_regs;
+
+ irq_enter();
+ old_regs = set_irq_regs(regs);
+ handle_arch_irq(regs);
+ set_irq_regs(old_regs);
+ irq_exit();
+}
#endif