Re: [PATCH 5/6] KVM: PPC: e500: Use kmalloc_array() in kvmppc_e500_tlb_init()

[Julia Lawall]

On Sun, 28 Aug 2016, SF Markus Elfring wrote:

> From: Markus Elfring <elfring@xxxxxxxxxxxxxxxxxxxxx>
> Date: Sun, 28 Aug 2016 18:40:08 +0200
>
> * A multiplication for the size determination of a memory allocation
>   indicated that an array data structure should be processed.
>   Thus use the corresponding function "kmalloc_array".
>
> * Replace the specification of a data structure by a pointer dereference
>   to make the corresponding size determination a bit safer according to
>   the Linux coding style convention.
>
> Signed-off-by: Markus Elfring <elfring@xxxxxxxxxxxxxxxxxxxxx>
> ---
>  arch/powerpc/kvm/e500_mmu.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/arch/powerpc/kvm/e500_mmu.c b/arch/powerpc/kvm/e500_mmu.c
> index 2be2afc4..0a2eeb1 100644
> --- a/arch/powerpc/kvm/e500_mmu.c
> +++ b/arch/powerpc/kvm/e500_mmu.c
> @@ -905,8 +905,6 @@ static int vcpu_mmu_init(struct kvm_vcpu *vcpu,
>  int kvmppc_e500_tlb_init(struct kvmppc_vcpu_e500 *vcpu_e500)
>  {
>  	struct kvm_vcpu *vcpu = &vcpu_e500->vcpu;
> -	int entry_size = sizeof(struct kvm_book3e_206_tlb_entry);
> -	int entries = KVM_E500_TLB0_SIZE + KVM_E500_TLB1_SIZE;
>
>  	if (e500_mmu_host_init(vcpu_e500))
>  		goto err;
> @@ -921,7 +919,10 @@ int kvmppc_e500_tlb_init(struct kvmppc_vcpu_e500 *vcpu_e500)
>  	vcpu_e500->gtlb_params[1].ways = KVM_E500_TLB1_SIZE;
>  	vcpu_e500->gtlb_params[1].sets = 1;
>
> -	vcpu_e500->gtlb_arch = kmalloc(entries * entry_size, GFP_KERNEL);
> +	vcpu_e500->gtlb_arch = kmalloc_array(KVM_E500_TLB0_SIZE +
> +					     KVM_E500_TLB1_SIZE,
> +					     sizeof(*vcpu_e500->gtlb_arch),
> +					     GFP_KERNEL);

There are changes here that are not mentioned in the commit log.

julia

>  	if (!vcpu_e500->gtlb_arch)
>  		return -ENOMEM;
>
> --
> 2.9.3
>
> --
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