Hi Sakari, > -----Original Message----- > From: sakari.ai...@linux.intel.com [mailto:sakari.ai...@linux.intel.com] > Sent: Thursday, September 13, 2018 4:38 AM > To: Mani, Rajmohan <rajmohan.m...@intel.com> > Cc: Hans Verkuil <hverk...@xs4all.nl>; Zhi, Yong <yong....@intel.com>; linux- > me...@vger.kernel.org; tf...@chromium.org; mche...@kernel.org; > hans.verk...@cisco.com; laurent.pinch...@ideasonboard.com; Zheng, Jian Xu > <jian.xu.zh...@intel.com>; Hu, Jerry W <jerry.w...@intel.com>; Li, Chao C > <chao.c...@intel.com>; Qiu, Tian Shu <tian.shu....@intel.com> > Subject: Re: [PATCH v1 2/2] v4l: Document Intel IPU3 meta data uAPI > > Hi Raj, > > My apologies for the delayed reply. > > On Fri, Aug 31, 2018 at 11:39:54PM +0000, Mani, Rajmohan wrote: > ... > > > > +struct ipu3_uapi_af_meta_data { > > > > + __u8 y_table[IPU3_UAPI_AF_Y_TABLE_MAX_SIZE] IPU3_ALIGN; > > > > > > Here IPU3_ALIGN is put at the end... > > > > > > > +} __packed; > > > > + > > > > +/** > > > > + * struct ipu3_uapi_af_raw_buffer - AF raw buffer > > > > + * > > > > + * @meta_data: raw buffer &ipu3_uapi_af_meta_data for auto focus > > > > +meta > > > data. > > > > + */ > > > > +struct ipu3_uapi_af_raw_buffer { > > > > + IPU3_ALIGN struct ipu3_uapi_af_meta_data meta_data; > > > > > > ... and here at the start. Is that due to the difference between an > > > array and a struct? > > > > > > > No. > > > > When preparing uAPI kernelDoc using "make htmldocs", the kernel-doc > > encounters two type of error/warnings caused by IPU3_ALIGN. > > > > case 1: > > struct IPU3_ALIGN ipu3_uapi_dummy { > > ... > > } __packed; > > > > "error: Cannot parse struct or union!" > > > > case 2: > > struct ipu3_uapi_dummy { > > struct ipu3_uapi_x x IPU3_ALIGN; > > } __packed; > > > > "warning: Function parameter or member 'IPU3_ALIGN' not described in > > 'ipu3_uapi_dummy'" > > > > Positioned the attribute syntax without altering the mem layout of the > > structs, while also making "make htmldocs" to compile fine. > > > > Let us know if it's okay to ignore Sphinx warnings. > > I looked a bit at different options for handling this in scripts/kernel-doc > but the > difficulty in macro substitution comes in determining where to do the > substitution and where not to. That seems unaddressable in the kernel-doc > script; most of the time you want the definitions as-is while this is likely > the > only case where something else might be appropriate. Making IPU3_ALIGN a > special case probably wouldn't really fly either. > > In this particular case I'd just write open the alignment requirement so > kernel- > doc can correctly parse it.
Ack. > > -- > Kind regards, > > Sakari Ailus > sakari.ai...@linux.intel.com
