Stephen Rothwell <s...@canb.auug.org.au> writes:
> Hi Aneesh,
>
> On Mon, 9 Jul 2012 18:43:33 +0530 "Aneesh Kumar K.V"
> <aneesh.ku...@linux.vnet.ibm.com> wrote:
>>
>> diff --git a/arch/powerpc/mm/hash_native_64.c
>> b/arch/powerpc/mm/hash_native_64.c
>> index 660b8bb..308e29d 100644
>> --- a/arch/powerpc/mm/hash_native_64.c
>> +++ b/arch/powerpc/mm/hash_native_64.c
>> @@ -39,22 +39,33 @@
>>
>> DEFINE_RAW_SPINLOCK(native_tlbie_lock);
>>
>> -static inline void __tlbie(unsigned long va, int psize, int ssize)
>> +static inline void __tlbie(unsigned long vpn, int psize, int ssize)
>> {
>> + unsigned long va;
>> unsigned int penc;
>>
>> + /*
>> + * We need 14 to 65 bits of va for a tlibe of 4K page
>> + * With vpn we ignore the lower VPN_SHIFT bits already.
>> + * And top two bits are already ignored because we can
>> + * only accomadate 76 bits in a 64 bit vpn with a VPN_SHIFT
>> + * of 12.
>> + */
>> + BUG_ON((77 - 65) > VPN_SHIFT);
>
> BUILD_BUG_ON() ?
Yes. I also found a bug there. It should be updated as below
BUILD_BUG_ON(VPN_SHIFT > (77 - 65));
We want to make sure we are not ignoring bits above 65th bit.
>
>> -static inline void __tlbiel(unsigned long va, int psize, int ssize)
>> +static inline void __tlbiel(unsigned long vpn, int psize, int ssize)
>> {
>> + unsigned long va;
>> unsigned int penc;
>>
>> + BUG_ON((77 - 65) > VPN_SHIFT);
>
> BUILD_BUG_ON() ?
-aneesh
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