linux-kernel - Re: [RFC PATCH 4/8] thp: Add thp_get_unmapped_area

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Date: Sat, 17 Feb 2024 14:57:44 +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 4/8] thp: Add thp_get_unmapped_area_vmflags()

On Fri, Feb 16, 2024 at 10:21:13PM +0000, Edgecombe, Rick P wrote:
> On Fri, 2024-02-16 at 14:59 +0200, Kirill A. Shutemov wrote:
> > On Thu, Feb 15, 2024 at 03:13:28PM -0800, Rick Edgecombe wrote:
> > > +unsigned long thp_get_unmapped_area(struct file *filp, unsigned
> > > long addr,
> > > +               unsigned long len, unsigned long pgoff, unsigned
> > > long flags)
> > > +{
> > > +       return thp_get_unmapped_area_vmflags(filp, addr, len,
> > > pgoff, flags, 0);
> > >   }
> > >   EXPORT_SYMBOL_GPL(thp_get_unmapped_area);
> > 
> > Again, static inline should be fine.
> 
> Not sure if the diff might be a bit misleading here, the signature of
> thp_get_unmapped_area() didn't actually change.
> 
> If thp_get_unmapped_area() is made into a static inline, then
> thp_get_unmapped_area_vmflags() would need to be exported instead so it
> could be used in some modules. Unlike get_unmapped_area()
> thp_get_unmapped_area is actually is used that way.
> 
> Better to export the more limited version?

Okay, it is a valid point.

-- 
  Kiryl Shutsemau / Kirill A. Shutemov