linux-kernel - [PATCH 2/2] x86, sched: Fix the undefined reference building error of init_freq_invariance

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Date:   Thu, 6 Jan 2022 15:43:06 +0800
From:   Huang Rui <ray.huang@....com>
To:     "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        <linux-pm@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     Perry Yuan <Perry.Yuan@....com>, Jinzhou Su <Jinzhou.Su@....com>,
        "Xiaojian Du" <Xiaojian.Du@....com>, Huang Rui <ray.huang@....com>,
        kernel test robot <lkp@...el.com>,
        Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>, <x86@...nel.org>,
        <stable@...r.kernel.org>
Subject: [PATCH 2/2] x86, sched: Fix the undefined reference building error of init_freq_invariance_cppc

The init_freq_invariance_cppc function is implemented in smpboot and depends on
CONFIG_SMP.

  MODPOST vmlinux.symvers
  MODINFO modules.builtin.modinfo
  GEN     modules.builtin
  LD      .tmp_vmlinux.kallsyms1
ld: drivers/acpi/cppc_acpi.o: in function `acpi_cppc_processor_probe':
/home/ray/brahma3/linux/drivers/acpi/cppc_acpi.c:819: undefined reference to `init_freq_invariance_cppc'
make: *** [Makefile:1161: vmlinux] Error 1

See https://lore.kernel.org/lkml/484af487-7511-647e-5c5b-33d4429acdec@infradead.org/.

Fixes: 41ea667227ba ("x86, sched: Calculate frequency invariance for AMD systems")
Reported-by: kernel test robot <lkp@...el.com>
Reported-by: Randy Dunlap <rdunlap@...radead.org>
Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
Signed-off-by: Huang Rui <ray.huang@....com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: x86@...nel.org
Cc: stable@...r.kernel.org
---
 arch/x86/include/asm/topology.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/topology.h b/arch/x86/include/asm/topology.h
index cc164777e661..2f0b6be8eaab 100644
--- a/arch/x86/include/asm/topology.h
+++ b/arch/x86/include/asm/topology.h
@@ -221,7 +221,7 @@ static inline void arch_set_max_freq_ratio(bool turbo_disabled)
 }
 #endif
 
-#ifdef CONFIG_ACPI_CPPC_LIB
+#if defined(CONFIG_ACPI_CPPC_LIB) && defined(CONFIG_SMP)
 void init_freq_invariance_cppc(void);
 #define init_freq_invariance_cppc init_freq_invariance_cppc
 #endif
-- 
2.25.1