From 27d2afa3b4eab5fb2a03b6ad8b74a3a700e92dce Mon Sep 17 00:00:00 2001 From: Christophe JAILLET Date: Sun, 19 Oct 2025 10:18:20 +0200 Subject: [PATCH] x86/ioapic: Simplify mp_irqdomain_alloc() slightly The IRQ return value of irq_find_mapping() is only tested for existence, not used for anything else. So, this call can be replaced by a slightly simpler irq_resolve_mapping() call, which reduces generated code size a bit (x86-64 allmodconfig): text data bss dec hex filename 82142 38633 18048 138823 21e47 arch/x86/kernel/apic/io_apic.o.before 81932 38633 18048 138613 21d75 arch/x86/kernel/apic/io_apic.o.after [ mingo: Fixed & simplified the changelog ] Signed-off-by: Christophe JAILLET Signed-off-by: Ingo Molnar Cc: Thomas Gleixner Cc: kernel-janitors@vger.kernel.org Link: https://patch.msgid.link/cb3a4968538637aac3a5ae4f5ecc4f5eb43376ea.1760861877.git.christophe.jaillet@wanadoo.fr --- arch/x86/kernel/apic/io_apic.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c index 5ba2feb2c04c6..1e0442e867b1c 100644 --- a/arch/x86/kernel/apic/io_apic.c +++ b/arch/x86/kernel/apic/io_apic.c @@ -2864,7 +2864,7 @@ int mp_irqdomain_alloc(struct irq_domain *domain, unsigned int virq, ioapic = mp_irqdomain_ioapic_idx(domain); pin = info->ioapic.pin; - if (irq_find_mapping(domain, (irq_hw_number_t)pin) > 0) + if (irq_resolve_mapping(domain, (irq_hw_number_t)pin)) return -EEXIST; data = kzalloc(sizeof(*data), GFP_KERNEL); -- 2.47.3