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x86/apic: Inline __x2apic_send_IPI_dest()

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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 <edumazet@google.com>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/20251223052026.4141498-1-edumazet@google.com
This commit is contained in:
Eric Dumazet 2025-12-23 05:20:26 +00:00 committed by Thomas Gleixner
parent 63804fed14
commit 9bad74127f
2 changed files with 9 additions and 7 deletions
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10
arch/x86/kernel/apic/local.h
View File

@ -14,7 +14,6 @@
#include <asm/apic.h>
/* 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);

6
arch/x86/kernel/apic/x2apic_phys.c
View File

@ -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)