Re: [dm-devel] [PATCH v05 04/72] dm-log-userspace.h: use __u32, __s32 and __u64 from linux/types.h

[Bart Van Assche]

On 08/23/16 13:42, Mikko Rapeli wrote:
> On Tue, Aug 23, 2016 at 02:28:19PM +0000, Bart Van Assche wrote:
>> On 08/23/16 06:57, Bart Van Assche wrote:
>>> On 08/22/16 11:32, Mikko Rapeli wrote:
>>>> - * uint32_t (*get_region_size)(struct dm_dirty_log *log);
>>>> + * __u32 (*get_region_size)(struct dm_dirty_log *log);
>>>
>>> uint32_t is a type that is defined by ANSI C but __u32 not. So this
>>> change looks wrong to me. Would it have been sufficient to add "#include
>>> <linux/types.h>" and keep the uint32_t etc. type names?
>>
>> Answering my own question: adding "#include <linux/types.h>" wouldn't be
>> sufficient. How about adding the following code that also occurs in a
>> few other uapi header files?
>>
>> #ifndef __KERNEL__
>> #include <stdint.h>
>> #endif
>> #include <linux/types.h>
>
> I have tried that before but I was instructed to use the linux/types.h
> versions. For example https://lkml.org/lkml/2015/6/1/160
>
> But lately drm and fuse and some others have questioned this approach and
> would like to use/continue using C99 stdint.h types.

Hello Mikko,

Thanks for the feedback. I have a minor comment though about your patch: 
are you aware that you have changed uint64_t into __u64 in source code 
comments but that int64_t has not been changed into __s64?

Bart.