linux-kernel - Re: [PATCH 12/73] powerpc: kvm e500/44x is not modular, so don't use module

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Date:	Tue, 21 Jan 2014 17:23:34 -0500
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	<linux-kernel@...r.kernel.org>
CC:	<linux-arch@...r.kernel.org>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Gleb Natapov <gleb@...nel.org>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Alexander Graf <agraf@...e.de>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>, <kvm@...r.kernel.org>,
	<kvm-ppc@...r.kernel.org>, <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH 12/73] powerpc: kvm e500/44x is not modular, so don't
 use module_init

On 14-01-21 04:22 PM, Paul Gortmaker wrote:
> In powerpc, CONFIG_KVM is bool, and  so are these three subarch
> options, for the 44x and e500 variants.  This means that any
> module_exit() calls and functions used by them such as the
> kvmppc_booke_exit() are dead code.  Here we remove them.
> 
> In addition, rather than use module_init, which is just
> __initcall for non-modules, we update those as well.
> 
> Note that direct use of __initcall is discouraged, vs. one
> of the priority categorized subgroups.  As __initcall gets
> mapped onto device_initcall, our use of subsys_initcall (which
> seems to make sense for netfilter code) will thus change this

I've fixed the above --  s/netfilter/PPC KVM/

The risks of recycling commit logs...

Paul.
--

> registration from level 6-device to level 4-subsys (i.e. slightly
> earlier).
> 
> However no impact of that small difference is expected,
> since the arch independent kvm code doesn't trigger any init;
> it is the arch initcalls here which actually call kvm_init.
> 
> Cc: Gleb Natapov <gleb@...nel.org>
> Cc: Paolo Bonzini <pbonzini@...hat.com>
> Cc: Alexander Graf <agraf@...e.de>
> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: kvm@...r.kernel.org
> Cc: kvm-ppc@...r.kernel.org
> Cc: linuxppc-dev@...ts.ozlabs.org
> Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
> ---
>  arch/powerpc/include/asm/kvm_ppc.h |  1 -
>  arch/powerpc/kvm/44x.c             | 10 +---------
>  arch/powerpc/kvm/booke.c           |  6 ------
>  arch/powerpc/kvm/e500.c            | 10 +---------
>  arch/powerpc/kvm/e500mc.c          | 10 +---------
>  5 files changed, 3 insertions(+), 34 deletions(-)
> 
> diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h
> index c8317fb..8466df5 100644
> --- a/arch/powerpc/include/asm/kvm_ppc.h
> +++ b/arch/powerpc/include/asm/kvm_ppc.h
> @@ -109,7 +109,6 @@ extern void kvmppc_core_flush_tlb(struct kvm_vcpu *vcpu);
>  extern int kvmppc_core_check_requests(struct kvm_vcpu *vcpu);
>  
>  extern int kvmppc_booke_init(void);
> -extern void kvmppc_booke_exit(void);
>  
>  extern void kvmppc_core_destroy_mmu(struct kvm_vcpu *vcpu);
>  extern int kvmppc_kvm_pv(struct kvm_vcpu *vcpu);
> diff --git a/arch/powerpc/kvm/44x.c b/arch/powerpc/kvm/44x.c
> index 93221e8..2129fc1 100644
> --- a/arch/powerpc/kvm/44x.c
> +++ b/arch/powerpc/kvm/44x.c
> @@ -222,12 +222,4 @@ static int __init kvmppc_44x_init(void)
>  err_out:
>  	return r;
>  }
> -
> -static void __exit kvmppc_44x_exit(void)
> -{
> -	kvmppc_pr_ops = NULL;
> -	kvmppc_booke_exit();
> -}
> -
> -module_init(kvmppc_44x_init);
> -module_exit(kvmppc_44x_exit);
> +subsys_initcall(kvmppc_44x_init);
> diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
> index 0591e05..49dffa2 100644
> --- a/arch/powerpc/kvm/booke.c
> +++ b/arch/powerpc/kvm/booke.c
> @@ -1995,9 +1995,3 @@ int __init kvmppc_booke_init(void)
>  #endif /* !BOOKE_HV */
>  	return 0;
>  }
> -
> -void __exit kvmppc_booke_exit(void)
> -{
> -	free_pages(kvmppc_booke_handlers, VCPU_SIZE_ORDER);
> -	kvm_exit();
> -}
> diff --git a/arch/powerpc/kvm/e500.c b/arch/powerpc/kvm/e500.c
> index 497b142..115ef12 100644
> --- a/arch/powerpc/kvm/e500.c
> +++ b/arch/powerpc/kvm/e500.c
> @@ -564,12 +564,4 @@ static int __init kvmppc_e500_init(void)
>  err_out:
>  	return r;
>  }
> -
> -static void __exit kvmppc_e500_exit(void)
> -{
> -	kvmppc_pr_ops = NULL;
> -	kvmppc_booke_exit();
> -}
> -
> -module_init(kvmppc_e500_init);
> -module_exit(kvmppc_e500_exit);
> +subsys_initcall(kvmppc_e500_init);
> diff --git a/arch/powerpc/kvm/e500mc.c b/arch/powerpc/kvm/e500mc.c
> index 4132cd2..612c216 100644
> --- a/arch/powerpc/kvm/e500mc.c
> +++ b/arch/powerpc/kvm/e500mc.c
> @@ -382,12 +382,4 @@ static int __init kvmppc_e500mc_init(void)
>  err_out:
>  	return r;
>  }
> -
> -static void __exit kvmppc_e500mc_exit(void)
> -{
> -	kvmppc_pr_ops = NULL;
> -	kvmppc_booke_exit();
> -}
> -
> -module_init(kvmppc_e500mc_init);
> -module_exit(kvmppc_e500mc_exit);
> +subsys_initcall(kvmppc_e500mc_init);
> 
--
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