From: Eric Dumazet Date: Tue, 23 Dec 2025 05:20:26 +0000 (+0000) Subject: x86/apic: Inline __x2apic_send_IPI_dest() X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9bad74127f0ae8eeed2510fe381b064e08e6507e;p=thirdparty%2Fkernel%2Flinux.git x86/apic: Inline __x2apic_send_IPI_dest() Avoid one call/ret in networking RPS/RFS fast path, with no space cost. scripts/bloat-o-meter -t vmlinux.before vmlinux.after add/remove: 0/2 grow/shrink: 2/0 up/down: 96/-97 (-1) Function old new delta x2apic_send_IPI 146 198 +52 __x2apic_send_IPI_mask 326 370 +44 __pfx___x2apic_send_IPI_dest 16 - -16 __x2apic_send_IPI_dest 81 - -81 Total: Before=20861234, After=20861233, chg -0.00% Signed-off-by: Eric Dumazet Signed-off-by: Thomas Gleixner Link: https://patch.msgid.link/20251223052026.4141498-1-edumazet@google.com --- diff --git a/arch/x86/kernel/apic/local.h b/arch/x86/kernel/apic/local.h index bdcf609eb2835..998efd4420635 100644 --- a/arch/x86/kernel/apic/local.h +++ b/arch/x86/kernel/apic/local.h @@ -14,7 +14,6 @@ #include /* X2APIC */ -void __x2apic_send_IPI_dest(unsigned int apicid, int vector, unsigned int dest); u32 x2apic_get_apic_id(u32 id); void x2apic_send_IPI_all(int vector); @@ -42,6 +41,15 @@ static inline unsigned int __prepare_ICR(unsigned int shortcut, int vector, return icr; } +#ifdef CONFIG_X86_X2APIC +static inline void __x2apic_send_IPI_dest(unsigned int apicid, int vector, unsigned int dest) +{ + unsigned long cfg = __prepare_ICR(0, vector, dest); + + native_x2apic_icr_write(cfg, apicid); +} +#endif + void default_init_apic_ldr(void); void apic_mem_wait_icr_idle(void); diff --git a/arch/x86/kernel/apic/x2apic_phys.c b/arch/x86/kernel/apic/x2apic_phys.c index 12d4c35547a6f..10f79026e8e31 100644 --- a/arch/x86/kernel/apic/x2apic_phys.c +++ b/arch/x86/kernel/apic/x2apic_phys.c @@ -107,12 +107,6 @@ void x2apic_send_IPI_self(int vector) apic_write(APIC_SELF_IPI, vector); } -void __x2apic_send_IPI_dest(unsigned int apicid, int vector, unsigned int dest) -{ - unsigned long cfg = __prepare_ICR(0, vector, dest); - native_x2apic_icr_write(cfg, apicid); -} - static int x2apic_phys_probe(void) { if (!x2apic_mode)