[PATCH 0/3] x86: Use static_call for three smp_ops methods

[Eric Dumazet]

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(-)

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2.52.0.351.gbe84eed79e-goog