Re: [PATCH v2 01/12] md/raid5: Factor out ahead_of_reshape() function

[Guoqing Jiang]

On 4/28/22 11:44 PM, Logan Gunthorpe wrote:
> On 2022-04-27 19:49, Guoqing Jiang wrote:
> > On 4/28/22 12:07 AM, Logan Gunthorpe wrote:
> > > On 2022-04-26 19:28, Guoqing Jiang wrote:
> > > > >     +static bool ahead_of_reshape(struct mddev *mddev, sector_t sector,
> > > > > +                 sector_t reshape_sector)
> > > > > +{
> > > > > +    if (mddev->reshape_backwards)
> > > > > +        return sector < reshape_sector;
> > > > > +    else
> > > > > +        return sector >= reshape_sector;
> > > > > +}
> > > > I think it can be an inline function.
> > > Marking static functions in C files as inline is not recommended. GCC
> > > will inline it, if it is appropriate.
> > >
> > > https://yarchive.net/comp/linux/inline.html
> > > https://www.kernel.org/doc/local/inline.html
> > Thanks for the link, then I suppose those can be deleted
> > linux> grep "static inline" drivers/md/md.h -r
> It's standard practice to annotate small functions in headers with
> "static inline". Without the inline annotation, any C file that includes
> the header and doesn't use the function will emit a "defined but not
> used warning".
>
> Functions in headers also should, by definition, be small and
> specifically inline-able (ie they are used as a type-safe macro).
>
> static functions in C files (not headers) should not have the inline
> keyword as GCC can optimize them and inline them as it sees fit and the
> inline keyword doesn't actually do anything.

I am happy to be taught, but still I can see lots of static function in 
C files
as well, at least

linux> grep "static inline" drivers/md/*.c -r|wc
     98     661    8630

Anyway, I don't want to argue about it anymore.

Thanks,
Guoqing