Re: [dpdk-dev] [PATCH v2] librte_eal/common: Fix cast from pointer to integer of different size

["Qiu, Michael" <michael.qiu@intel.com>]

On 3/3/2015 4:25 PM, Wodkowski, PawelX wrote:
> On 2015-03-03 03:20, Michael Qiu wrote:
>> /i686-native-linuxapp-gcc/include/rte_memcpy.h:592:23: error:
>> cast from pointer to integer of different size
>> [-Werror=pointer-to-int-cast]
>>
>>    dstofss = 16 - (int)((long long)(void *)dst & 0x0F) + 16;
>>
>> Type 'long long' is 64-bit in i686 platform while 'void *'
>> is 32-bit.
>>
>> Signed-off-by: Michael Qiu <michael.qiu@intel.com>
>> ---
>> v2 --> v1:
>> 	Remove unnecessary casting (void *)
>>
>>   lib/librte_eal/common/include/arch/x86/rte_memcpy.h | 4 ++--
>>   1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/lib/librte_eal/common/include/arch/x86/rte_memcpy.h b/lib/librte_eal/common/include/arch/x86/rte_memcpy.h
>> index 7b2d382..85a5f4d 100644
>> --- a/lib/librte_eal/common/include/arch/x86/rte_memcpy.h
>> +++ b/lib/librte_eal/common/include/arch/x86/rte_memcpy.h
>> @@ -589,12 +589,12 @@ COPY_BLOCK_64_BACK15:
>>   	 * unaligned copy functions require up to 15 bytes
>>   	 * backwards access.
>>   	 */
>> -	dstofss = 16 - (int)((long long)(void *)dst & 0x0F) + 16;
>> +	dstofss = 16 - (int)((long)dst & 0x0F) + 16;
>>   	n -= dstofss;
>>   	rte_mov32((uint8_t *)dst, (const uint8_t *)src);
>>   	src = (const uint8_t *)src + dstofss;
>>   	dst = (uint8_t *)dst + dstofss;
>> -	srcofs = (int)((long long)(const void *)src & 0x0F);
>> +	srcofs = (int)((long)src & 0x0F);
>>
>>   	/**
>>   	 * For aligned copy
>>
> I think you should use here size_t, (u)ptrdiff_t or (u)intptr_t as this 

Yes, but 'long' is enough, does it limit anything, or has any issue with
multiple platforms?
 
> will be more portable.
> Also type of dstofss and srcofs should be changed accordingly.

No, I think, it should be offset.

Thanks,
Michael
>