linux-kernel - Re: [RFC PATCH 3/8] mm: Use get_unmapped_area

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Message-ID: <35rzsyepg3wx5vjsyd5n5pix2c5oo6pibzfmdvlfbpmf2mvvgy@icrlxlydgs6z>
Date: Sat, 17 Feb 2024 14:35:23 +0200
From: "kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>
To: "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
Cc: "debug@...osinc.com" <debug@...osinc.com>, 
	"luto@...nel.org" <luto@...nel.org>, "x86@...nel.org" <x86@...nel.org>, 
	"Liam.Howlett@...cle.com" <Liam.Howlett@...cle.com>, "broonie@...nel.org" <broonie@...nel.org>, 
	"keescook@...omium.org" <keescook@...omium.org>, "bp@...en8.de" <bp@...en8.de>, 
	"mingo@...hat.com" <mingo@...hat.com>, "tglx@...utronix.de" <tglx@...utronix.de>, 
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>, "linux-mm@...ck.org" <linux-mm@...ck.org>, 
	"peterz@...radead.org" <peterz@...radead.org>, "hpa@...or.com" <hpa@...or.com>, 
	"dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 3/8] mm: Use get_unmapped_area_vmflags()

On Fri, Feb 16, 2024 at 10:15:05PM +0000, Edgecombe, Rick P wrote:
> On Fri, 2024-02-16 at 14:56 +0200, Kirill A. Shutemov wrote:
> > > +unsigned long
> > > +get_unmapped_area(struct file *file, unsigned long addr, unsigned
> > > long len,
> > > +               unsigned long pgoff, unsigned long flags)
> > > +{
> > > +       return __get_unmapped_area(file, addr, len, pgoff, flags,
> > > 0);
> > > +}
> > >   EXPORT_SYMBOL(get_unmapped_area);
> > 
> > Any reason it is not a static inline function in the header file?
> 
> get_unmapped_area() doesn't seem to be referenced from any modules. I
> don't think it needs to be exported actually. Maybe it used to be?
> 
> It could be a static inline it seems. Why are you thinking it would be
> better?

That's just what I would do for legacy interface wrapper for new function
interface. And save a function call for caller (it shouldn't matter in
this case, but still).

> I think maybe get_unmapped_area() should stay as is, static-inline
> wise, but remove the export, and the newly added __get_unmapped_area()
> should be made static. Does it sound reasonable?

Up to you.

-- 
  Kiryl Shutsemau / Kirill A. Shutemov