linux-kernel - Re: [RFC PATCH v2 14/20] x86/kvm: Make kvm_async_pf_enabled __ro_after

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Date:   Mon, 09 Oct 2023 19:40:31 +0300
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     Valentin Schneider <vschneid@...hat.com>,
        linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, kvm@...r.kernel.org, linux-mm@...ck.org,
        bpf@...r.kernel.org, x86@...nel.org, rcu@...r.kernel.org,
        linux-kselftest@...r.kernel.org
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        Masami Hiramatsu <mhiramat@...nel.org>,
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Subject: Re: [RFC PATCH v2 14/20] x86/kvm: Make kvm_async_pf_enabled
 __ro_after_init

У чт, 2023-07-20 у 17:30 +0100, Valentin Schneider пише:
> objtool now warns about it:
> 
>   vmlinux.o: warning: objtool: exc_page_fault+0x2a: Non __ro_after_init static key "kvm_async_pf_enabled" in .noinstr section
> 
> The key can only be enabled (and not disabled) in the __init function
> kvm_guest_init(), so mark it as __ro_after_init.
> 
> Signed-off-by: Valentin Schneider <vschneid@...hat.com>
> ---
>  arch/x86/kernel/kvm.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
> index 1cceac5984daa..319460090a836 100644
> --- a/arch/x86/kernel/kvm.c
> +++ b/arch/x86/kernel/kvm.c
> @@ -44,7 +44,7 @@
>  #include <asm/svm.h>
>  #include <asm/e820/api.h>
>  
> -DEFINE_STATIC_KEY_FALSE(kvm_async_pf_enabled);
> +DEFINE_STATIC_KEY_FALSE_RO(kvm_async_pf_enabled);
>  
>  static int kvmapf = 1;
>  
Reviewed-by: Maxim Levitsky <mlevitsk@...hat.com>

Best regards,
	Maxim Levitsky