entry: Split generic entry into generic exception and syscall entry

Currently CONFIG_GENERIC_ENTRY enables both the generic exception
entry logic and the generic syscall entry logic, which are otherwise
loosely coupled.

Introduce separate config options for these so that architectures can
select the two independently. This will make it easier for
architectures to migrate to generic entry code.

Suggested-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/20250213130007.1418890-2-ruanjinjie@huawei.com
Link: https://lore.kernel.org/all/20250624-generic-entry-split-v1-1-53d5ef4f94df@linaro.org

[Linus Walleij: rebase onto v6.16-rc1]

Author: ruanjinjie-eng

MAINTAINERS

@@ -10052,6 +10052,7 @@ S:	Maintained
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git core/entry
 F:	include/linux/entry-common.h
 F:	include/linux/entry-kvm.h
+F:	include/linux/irq-entry-common.h
 F:	kernel/entry/
 
 GENERIC GPIO I2C DRIVER

arch/Kconfig

@@ -64,8 +64,17 @@ config HOTPLUG_PARALLEL
 	bool
 	select HOTPLUG_SPLIT_STARTUP
 
+config GENERIC_IRQ_ENTRY
+	bool
+
+config GENERIC_SYSCALL
+	bool
+	depends on GENERIC_IRQ_ENTRY
+
 config GENERIC_ENTRY
 	bool
+	select GENERIC_IRQ_ENTRY
+	select GENERIC_SYSCALL
 
 config KPROBES
 	bool "Kprobes"