cpuidle, nospec: Make mds_idle_clear_cpu_buffers() noinstr clean
authorPeter Zijlstra <peterz@infradead.org>
Thu, 12 Jan 2023 19:43:45 +0000 (20:43 +0100)
committerIngo Molnar <mingo@kernel.org>
Fri, 13 Jan 2023 10:48:16 +0000 (11:48 +0100)
commit10fdb38cee36b8dc4775e6fe4ad85e78bafdbd65
treee11aaf2187ddc03f97e1148418eb410e321bfd2f
parent10a099405fdf96c3205ae775abf19fcd301b31b4
cpuidle, nospec: Make mds_idle_clear_cpu_buffers() noinstr clean

objtool found that the mds_idle_clear_cpu_buffers() method got
uninlined by the compiler where it called out into instrumentation:

  vmlinux.o: warning: objtool: mwait_idle+0x47: call to mds_idle_clear_cpu_buffers() leaves .noinstr.text section
  vmlinux.o: warning: objtool: acpi_processor_ffh_cstate_enter+0xa2: call to mds_idle_clear_cpu_buffers() leaves .noinstr.text section
  vmlinux.o: warning: objtool: intel_idle+0x91: call to mds_idle_clear_cpu_buffers() leaves .noinstr.text section
  vmlinux.o: warning: objtool: intel_idle_s2idle+0x8c: call to mds_idle_clear_cpu_buffers() leaves .noinstr.text section
  vmlinux.o: warning: objtool: intel_idle_irq+0xaa: call to mds_idle_clear_cpu_buffers() leaves .noinstr.text section

Solve this by marking mds_idle_clear_cpu_buffers() as __always_inline.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Tested-by: Tony Lindgren <tony@atomide.com>
Tested-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Frederic Weisbecker <frederic@kernel.org>
Link: https://lore.kernel.org/r/20230112195541.233779815@infradead.org
arch/x86/include/asm/nospec-branch.h