Re: [PATCH 19/21] KVM: MIPS: Drop @max param from mmu_topup_memory_cache()

Huacai Chen
2020-06-08T08:56:50Z

Reviewed-by: Huacai Chen <chenhc@lemote.com>

On Sat, Jun 6, 2020 at 5:44 AM Sean Christopherson
<sean.j.christopherson@intel.com> wrote:
>
> Replace the @max param in mmu_topup_memory_cache() and instead use
> ARRAY_SIZE() to terminate the loop to fill the cache. This removes a
> BUG_ON() and sets the stage for moving MIPS to the common memory cache
> implementation.
>
> No functional change intended.
>
> Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
> ---
> arch/mips/kvm/mmu.c | 12 ++++--------
> 1 file changed, 4 insertions(+), 8 deletions(-)
>
> diff --git a/arch/mips/kvm/mmu.c b/arch/mips/kvm/mmu.c
> index 7dad7a293eae..94562c54b930 100644
> --- a/arch/mips/kvm/mmu.c
> +++ b/arch/mips/kvm/mmu.c
> @@ -25,15 +25,13 @@
> #define KVM_MMU_CACHE_MIN_PAGES 2
> #endif
>
> -static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache,
> - int min, int max)
> +static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache, int min)
> {
> void *page;
>
> - BUG_ON(max > KVM_NR_MEM_OBJS);
> if (cache->nobjs >= min)
> return 0;
> - while (cache->nobjs < max) {
> + while (cache->nobjs < ARRAY_SIZE(cache->objects)) {
> page = (void *)__get_free_page(GFP_KERNEL);
> if (!page)
> return -ENOMEM;
> @@ -711,8 +709,7 @@ static int kvm_mips_map_page(struct kvm_vcpu *vcpu, unsigned long gpa,
> goto out;
>
> /* We need a minimum of cached pages ready for page table creation */
> - err = mmu_topup_memory_cache(memcache, KVM_MMU_CACHE_MIN_PAGES,
> - KVM_NR_MEM_OBJS);
> + err = mmu_topup_memory_cache(memcache, KVM_MMU_CACHE_MIN_PAGES);
> if (err)
> goto out;
>
> @@ -796,8 +793,7 @@ static pte_t *kvm_trap_emul_pte_for_gva(struct kvm_vcpu *vcpu,
> int ret;
>
> /* We need a minimum of cached pages ready for page table creation */
> - ret = mmu_topup_memory_cache(memcache, KVM_MMU_CACHE_MIN_PAGES,
> - KVM_NR_MEM_OBJS);
> + ret = mmu_topup_memory_cache(memcache, KVM_MMU_CACHE_MIN_PAGES);
> if (ret)
> return NULL;
>
> --
> 2.26.0
>