linux-kernel - Re: [PATCH] x86/fred: fix building without CONFIG

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Date: Fri, 16 Feb 2024 17:46:21 -0800
From: Randy Dunlap <rdunlap@...radead.org>
To: Arnd Bergmann <arnd@...nel.org>, Xin Li <xin@...or.com>,
 "H. Peter Anvin" <hpa@...or.com>
Cc: Arnd Bergmann <arnd@...db.de>, Andy Lutomirski <luto@...nel.org>,
 Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
 Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>,
 x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/fred: fix building without CONFIG_KVM



On 2/16/24 12:25, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> Some constants are only defined if KVM is enabled:
> 
> arch/x86/entry/entry_fred.c:117:9: error: use of undeclared identifier 'POSTED_INTR_VECTOR'
>   117 |         SYSVEC(POSTED_INTR_VECTOR,              kvm_posted_intr_ipi),
>       |                ^
> arch/x86/entry/entry_fred.c:118:9: error: use of undeclared identifier 'POSTED_INTR_WAKEUP_VECTOR'
>   118 |         SYSVEC(POSTED_INTR_WAKEUP_VECTOR,       kvm_posted_intr_wakeup_ipi),
>       |                ^
> arch/x86/entry/entry_fred.c:119:9: error: use of undeclared identifier 'POSTED_INTR_NESTED_VECTOR'
>   119 |         SYSVEC(POSTED_INTR_NESTED_VECTOR,       kvm_posted_intr_nested_ipi),
>       |                ^
> 
> Hiding the references behind the same preprocessor conditional is
> probably the best fix here.
> 
> Fixes: 14619d912b65 ("x86/fred: FRED entry/exit and dispatch code")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Acked-by: Randy Dunlap <rdunlap@...radead.org>
Tested-by: Randy Dunlap <rdunlap@...radead.org>

Thanks.

> ---
>  arch/x86/entry/entry_fred.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/arch/x86/entry/entry_fred.c b/arch/x86/entry/entry_fred.c
> index ac120cbdaaf2..660b7f7f9a79 100644
> --- a/arch/x86/entry/entry_fred.c
> +++ b/arch/x86/entry/entry_fred.c
> @@ -114,9 +114,11 @@ static idtentry_t sysvec_table[NR_SYSTEM_VECTORS] __ro_after_init = {
>  
>  	SYSVEC(IRQ_WORK_VECTOR,			irq_work),
>  
> +#if IS_ENABLED(CONFIG_KVM)
>  	SYSVEC(POSTED_INTR_VECTOR,		kvm_posted_intr_ipi),
>  	SYSVEC(POSTED_INTR_WAKEUP_VECTOR,	kvm_posted_intr_wakeup_ipi),
>  	SYSVEC(POSTED_INTR_NESTED_VECTOR,	kvm_posted_intr_nested_ipi),
> +#endif
>  };
>  
>  static bool fred_setup_done __initdata;

-- 
#Randy