linux-kernel - [PATCH 0/3] x86: Use static_call for three smp

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Message-ID: <20251222201406.3725665-1-edumazet@google.com>
Date: Mon, 22 Dec 2025 20:14:03 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, 
	Dave Hansen <dave.hansen@...ux.intel.com>, Peter Zijlstra <peterz@...radead.org>, x86@...nel.org, 
	"H . Peter Anvin" <hpa@...or.com>
Cc: linux-kernel <linux-kernel@...r.kernel.org>, Eric Dumazet <eric.dumazet@...il.com>, 
	Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH 0/3] x86: Use static_call for three smp_ops methods

Busy hosts with RFS enabled can send more than 6,000,000 IPI
per second. arch_send_call_function_single_ipi() is currently
using an indirect call (because Xen can override the target).

Indirect calls are expensive on some platforms with retpoline.

This series converts three smp_ops methods to static_call
infrastructure to remove common indirect calls.

Eric Dumazet (3):
  x86/smp: Use static_call for arch_send_call_function_single_ipi()
  x86/smp: Use static_call for arch_smp_send_reschedule()
  x86/smp: Use static_call for arch_send_call_function_ipi()

 arch/x86/include/asm/smp.h | 23 +++++++++++++++++------
 arch/x86/kernel/smp.c      | 19 +++++++++++++++++++
 arch/x86/xen/smp_hvm.c     |  1 +
 arch/x86/xen/smp_pv.c      |  1 +
 4 files changed, 38 insertions(+), 6 deletions(-)

-- 
2.52.0.351.gbe84eed79e-goog