linux-kernel - Re: [PATCH 01/40] lib/string_helpers: Drop space in string_get

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Date:   Wed, 3 May 2023 09:30:11 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Kent Overstreet <kent.overstreet@...ux.dev>
Cc:     James Bottomley <James.Bottomley@...senpartnership.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
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        Noralf Trï¿½nnes <noralf@...nnes.org>
Subject: Re: [PATCH 01/40] lib/string_helpers: Drop space in string_get_size's output

On Wed, May 3, 2023 at 5:07 AM Kent Overstreet
<kent.overstreet@...ux.dev> wrote:
> On Tue, May 02, 2023 at 06:19:27PM +0300, Andy Shevchenko wrote:
> > On Tue, May 2, 2023 at 9:22 AM Kent Overstreet
> > <kent.overstreet@...ux.dev> wrote:
> > > On Tue, May 02, 2023 at 08:33:57AM +0300, Andy Shevchenko wrote:
> > > > Actually instead of producing zillions of variants, do a %p extension
> > > > to the printf() and that's it. We have, for example, %pt with T and
> > > > with space to follow users that want one or the other variant. Same
> > > > can be done with string_get_size().
> > >
> > > God no.
> >
> > Any elaboration what's wrong with that?
>
> I'm really not a fan of %p extensions in general (they are what people
> reach for because we can't standardize on a common string output API),

The whole story behind, for example, %pt is to _standardize_ the
output of the same stanza in the kernel.

> but when we'd be passing it bare integers the lack of type safety would
> be a particularly big footgun.

There is no difference to any other place in the kernel where we can
shoot into our foot.

> > God no for zillion APIs for almost the same. Today you want space,
> > tomorrow some other (special) delimiter.
>
> No, I just want to delete the space and output numbers the same way
> everyone else does. And if we are stuck with two string_get_size()
> functions, %p extensions in no way improve the situation.

I think it's exactly for the opposite, i.e. standardize that output
once and for all.

-- 
With Best Regards,
Andy Shevchenko