Re: [PATCH] checkpatch: Allow spaces before the ':' of a bitfield

[Joe Perches <joe@perches.com>]

On Mon, 2013-10-14 at 11:00 -0700, Josh Triplett wrote:
> On Mon, Oct 14, 2013 at 10:51:48AM -0700, Joe Perches wrote:
> > On Mon, 2013-10-14 at 10:32 -0700, Josh Triplett wrote:
> > > checkpatch warns about spaces both before and after the ':' separating a
> > > bitfield name from its width.  However, many drivers do put space before
> > > the : to line up the widths, which makes the definition significantly
> > > more readable; checkpatch should not warn about that.  Remove the
> > > warning for space before the ':' of a bitfield.
> > 
> > There are a _bunch_ of different styles used for
> > alignment of bitfields.
> > 
> > $ grep -rPh --include=*.[ch] \
> >   '(?:unsigned\s+|signed\s+|)(char|short|long|long\s+long|\w+_t|(?:__|)(?:u|s)(?:8|16|32|64))\s+\w+\s*:\s*\d+\s*(?:,|;)' *
> > 
> > spaces before colon
> > spaces after colon
> > aligned on bitfield size
> > 
> > I'd just as soon make it a --strict check.
> 
> I'd be fine with removing the check entirely, or making it --strict;
> however, even for --strict mode I'd suggest applying this patch, as I
> don't think checkpatch should ever prohibit spaces before the ':'.

Maybe something like that patch, but spaces probably
should be prohibited after the : in a bitfield either.

This style is pretty common

		u32 dma_address0                   :30;
		u32 dma_0No_update                 : 1;
		u32 dma_0start                     : 1;
		u32 dma_addr_size                  :24;
		u32 DMA_maxpackets                 : 8;