linux-kernel - Re: [PATCH v2 5/5] Lib: sort.h: replace int size with size

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Date:   Mon, 1 Apr 2019 13:28:06 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     George Spelvin <lkml@....org>
Cc:     st5pub@...dex.ru, adrian.hunter@...el.com,
        ard.biesheuvel@...aro.org, benh@...nel.crashing.org, bp@...en8.de,
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Subject: Re: [PATCH v2 5/5] Lib: sort.h: replace int size with size_t size in
 the swap function

On Mon, Apr 01, 2019 at 09:56:07AM +0000, George Spelvin wrote:
> On Mon, 1 Apr 2019 at 12:35:55 +0300, Andy Shevchenko wrote:
> > Hmm... If (*swap)() is called recursively it means the change might increase
> > stack usage on 64-bit platforms.
> > 
> > Am I missing something?
> 
> Under what conceivable circumstance would someone write a recursive
> (*swap)() function?
> 
> You're technically right, but the precondition is more fantastical
> than "if the U.K.'s parliament get their shit together before the
> 12th", so I have a hard time worrying about it.
> 
> But you did make me think of something: the whole reason swap()
> takes a size argument is for the benefit of the (no longer existing)
> generic swap functions.  All of the custom swap functions ignore
> it.
> 
> So how about *deleting* the parameter instead?  That simplifies
> everything.

I like this idea!

-- 
With Best Regards,
Andy Shevchenko