The following commit has been merged into the x86/apic branch of tip:
Commit-ID: 27d2afa3b4eab5fb2a03b6ad8b74a3a700e92dce
Gitweb: https://git.kernel.org/tip/27d2afa3b4eab5fb2a03b6ad8b74a3a700e92dce
Author: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
AuthorDate: Sun, 19 Oct 2025 10:18:20 +02:00
Committer: Ingo Molnar <mingo@kernel.org>
CommitterDate: Tue, 21 Oct 2025 08:47:33 +02:00
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 <christophe.jaillet@wanadoo.fr>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
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 5ba2feb..1e0442e 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);