On 05.10.2011, at 18:06, Scott Wood wrote:
> On 10/05/2011 09:37 AM, Alexander Graf wrote:
>> diff --git a/arch/powerpc/kvm/e500_tlb.c b/arch/powerpc/kvm/e500_tlb.c
>> index ec17148..1dd96a9 100644
>> --- a/arch/powerpc/kvm/e500_tlb.c
>> +++ b/arch/powerpc/kvm/e500_tlb.c
>> @@ -24,6 +24,7 @@
>> #include <linux/sched.h>
>> #include <linux/rwsem.h>
>> #include <linux/vmalloc.h>
>> +#include <linux/hugetlb.h>
>> #include <asm/kvm_ppc.h>
>> #include <asm/kvm_e500.h>
>>
>> @@ -673,12 +674,31 @@ static inline void kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500,
>> pfn &= ~(tsize_pages - 1);
>> break;
>> }
>> + } else if (vma && hva >= vma->vm_start &&
>> + (vma->vm_flags & VM_HUGETLB)) {
>> + unsigned long psize = vma_kernel_pagesize(vma);
>> +
>> + tsize = (gtlbe->mas1 & MAS1_TSIZE_MASK) >>
>> + MAS1_TSIZE_SHIFT;
>> +
>> + /*
>> + * Take the largest page size that satisfies both host
>> + * and guest mapping
>> + */
>> + tsize = min(__ilog2(psize) - 10, tsize);
>
> Any reason for __ilog2() rather than ilog2()? Shouldn't make a
> difference, just curious about avoiding the public interface.
I grep'ed through the kernel tree and only found __ilog2 defined as well as mostly users for __ilog2, so I figured there's got to be a reason ;)
Alex
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