Re: [Xen-devel] [PATCH] x86/xen: Use DIV_ROUND_UP

[Juergen Gross <jgross@xxxxxxxx>]

On 29/06/16 17:34, Jan Beulich wrote:
>>>> On 29.06.16 at 17:00, <amitoj1606@xxxxxxxxx> wrote:
>> --- a/arch/x86/xen/enlighten.c
>> +++ b/arch/x86/xen/enlighten.c
>> @@ -591,7 +591,7 @@ static void xen_load_gdt(const struct desc_ptr *dtr)
>>  {
>>      unsigned long va = dtr->address;
>>      unsigned int size = dtr->size + 1;
>> -    unsigned pages = (size + PAGE_SIZE - 1) / PAGE_SIZE;
>> +    unsigned pages = DIV_ROUND_UP(size, PAGE_SIZE);
>>      unsigned long frames[pages];
>>      int f;
>>  
>> @@ -640,7 +640,7 @@ static void __init xen_load_gdt_boot(const struct 
>> desc_ptr *dtr)
>>  {
>>      unsigned long va = dtr->address;
>>      unsigned int size = dtr->size + 1;
>> -    unsigned pages = (size + PAGE_SIZE - 1) / PAGE_SIZE;
>> +    unsigned pages = DIV_ROUND_UP(size, PAGE_SIZE);
>>      unsigned long frames[pages];
>>      int f;
>>  
> 
> Perhaps even more readable would be PFN_DOWN()?

Or PFN_UP() to be correct?


Juergen


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