linux-kernel - Re: [External] Re: [PATCH v13 00/11] Parallel CPU bringup for x86

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Date:   Wed, 8 Mar 2023 14:10:05 +0000
From:   Usama Arif <usama.arif@...edance.com>
To:     David Woodhouse <dwmw2@...radead.org>,
        Tom Lendacky <thomas.lendacky@....com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "Phillips, Kim" <kim.phillips@....com>,
        "brgerst@...il.com" <brgerst@...il.com>,
        "Rapan, Sabin" <sabrapan@...zon.com>
Cc:     "piotrgorski@...hyos.org" <piotrgorski@...hyos.org>,
        "oleksandr@...alenko.name" <oleksandr@...alenko.name>,
        "arjan@...ux.intel.com" <arjan@...ux.intel.com>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "hpa@...or.com" <hpa@...or.com>, "x86@...nel.org" <x86@...nel.org>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
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        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "rcu@...r.kernel.org" <rcu@...r.kernel.org>,
        "mimoja@...oja.de" <mimoja@...oja.de>,
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        "punit.agrawal@...edance.com" <punit.agrawal@...edance.com>,
        "simon.evans@...edance.com" <simon.evans@...edance.com>,
        "liangma@...ngbit.com" <liangma@...ngbit.com>
Subject: Re: [External] Re: [PATCH v13 00/11] Parallel CPU bringup for x86_64



> static bool prepare_parallel_bringup(void)
> {
> 	bool has_sev_es = IS_ENABLED(CONFIG_AMD_MEM_ENCRYPT) &&
> 		static_branch_unlikely(&sev_es_enable_key);

sev_es_enable_key is only defined when CONFIG_AMD_MEM_ENCRYPT is 
enabled, so it gives a build error when AMD_MEM_ENCRYPT is disabled. 
maybe below is better?

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 282cca020777..e7df41436cfe 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -1519,8 +1519,12 @@ void __init smp_prepare_cpus_common(void)
   */
  static bool prepare_parallel_bringup(void)
  {
-       bool has_sev_es = IS_ENABLED(CONFIG_AMD_MEM_ENCRYPT) &&
-               static_branch_unlikely(&sev_es_enable_key);
+       bool has_sev_es;
+#ifdef CONFIG_AMD_MEM_ENCRYPT
+       has_sev_es = static_branch_unlikely(&sev_es_enable_key);
+#else
+       has_sev_es = 0;
+#endif

         if (IS_ENABLED(CONFIG_X86_32))
                 return false;