NO_IRQ is a relic from the old days. It is not used anymore in core functions. By the way, function irq_of_parse_and_map() returns value 0 on error.
In some drivers, NO_IRQ is erroneously used to check the return of irq_of_parse_and_map(). It is not a real bug today because the only architectures using the drivers being fixed by this patch define NO_IRQ as 0, but there are architectures which define NO_IRQ as -1. If one day those architectures start using the non fixed drivers, there will be a problem. Long time ago Linus advocated for not using NO_IRQ, see https://lkml.org/lkml/2005/11/21/221 . He re-iterated the same view recently in https://lkml.org/lkml/2022/10/12/622 So test !irq instead of tesing irq == NO_IRQ. All other usage of NO_IRQ for powerpc were remove in previous cycle so time has come to remove NO_IRQ completely for powerpc. Signed-off-by: Christophe Leroy <christophe.le...@csgroup.eu> --- arch/powerpc/include/asm/irq.h | 3 --- arch/powerpc/platforms/44x/fsp2.c | 2 +- 2 files changed, 1 insertion(+), 4 deletions(-) diff --git a/arch/powerpc/include/asm/irq.h b/arch/powerpc/include/asm/irq.h index 5c1516a5ba8f..deadd2149426 100644 --- a/arch/powerpc/include/asm/irq.h +++ b/arch/powerpc/include/asm/irq.h @@ -16,9 +16,6 @@ extern atomic_t ppc_n_lost_interrupts; -/* This number is used when no interrupt has been assigned */ -#define NO_IRQ (0) - /* Total number of virq in the platform */ #define NR_IRQS CONFIG_NR_IRQS diff --git a/arch/powerpc/platforms/44x/fsp2.c b/arch/powerpc/platforms/44x/fsp2.c index e2e4f6d8150d..56d91dbef577 100644 --- a/arch/powerpc/platforms/44x/fsp2.c +++ b/arch/powerpc/platforms/44x/fsp2.c @@ -205,7 +205,7 @@ static void __init node_irq_request(const char *compat, irq_handler_t errirq_han for_each_compatible_node(np, NULL, compat) { irq = irq_of_parse_and_map(np, 0); - if (irq == NO_IRQ) { + if (!irq) { pr_err("device tree node %pOFn is missing a interrupt", np); of_node_put(np); -- 2.38.1