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irqchip: Provide stronger type checking for IRQCHIP_MATCH/IRQCHIP_DECLARE

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Both IRQCHIP_DECLARE() and IRQCHIP_MATCH() use an underlying of_device_id()
structure to encode the matching property and the init callback.
However, this callback is stored in as a void * pointer, which obviously
defeat any attempt at stronger type checking.

Work around this by providing a new macro that builds on top of the
__typecheck() primitive, and that can be used to warn when there is
a discrepency between the drivers and core code.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20211020104527.3066268-1-maz@kernel.org
This commit is contained in:
Marc Zyngier 2021-10-20 09:33:21 +01:00
parent 9e1ff307c7
commit f198500283
1 changed files with 11 additions and 2 deletions
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13
include/linux/irqchip.h
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@ -14,8 +14,15 @@
#include <linux/acpi.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/platform_device.h>
/* Undefined on purpose */
extern of_irq_init_cb_t typecheck_irq_init_cb;
#define typecheck_irq_init_cb(fn) \
(__typecheck(typecheck_irq_init_cb, &fn) ? fn : fn)
/*
* This macro must be used by the different irqchip drivers to declare
* the association between their DT compatible string and their
@ -26,14 +33,16 @@
* @compstr: compatible string of the irqchip driver
* @fn: initialization function
*/
#define IRQCHIP_DECLARE(name, compat, fn) OF_DECLARE_2(irqchip, name, compat, fn)
#define IRQCHIP_DECLARE(name, compat, fn) \
OF_DECLARE_2(irqchip, name, compat, typecheck_irq_init_cb(fn))
extern int platform_irqchip_probe(struct platform_device *pdev);
#define IRQCHIP_PLATFORM_DRIVER_BEGIN(drv_name) \
static const struct of_device_id drv_name##_irqchip_match_table[] = {
#define IRQCHIP_MATCH(compat, fn) { .compatible = compat, .data = fn },
#define IRQCHIP_MATCH(compat, fn) { .compatible = compat, \
.data = typecheck_irq_init_cb(fn), },
#define IRQCHIP_PLATFORM_DRIVER_END(drv_name) \
{}, \