linux-kernel - Re: [PATCH 3/3] vdso: preallocate new vmas

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Message-ID: <CA+55aFxjBoLYbRM5hsASsLWxXkmizVY6Th2niOz2x3GQQgU+ig@mail.gmail.com>
Date:	Thu, 17 Oct 2013 18:17:02 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Davidlohr Bueso <davidlohr@...com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Michel Lespinasse <walken@...gle.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Rik van Riel <riel@...hat.com>,
	Tim Chen <tim.c.chen@...ux.intel.com>,
	"Chandramouleeswaran, Aswin" <aswin@...com>,
	linux-mm <linux-mm@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Russell King <linux@....linux.org.uk>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Richard Kuo <rkuo@...eaurora.org>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Paul Mundt <lethal@...ux-sh.org>,
	Chris Metcalf <cmetcalf@...era.com>,
	Jeff Dike <jdike@...toit.com>,
	Richard Weinberger <richard@....at>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH 3/3] vdso: preallocate new vmas

This seems somewhat insane:

   int install_special_mapping(struct mm_struct *mm,
                              unsigned long addr, unsigned long len,
  +                           unsigned long vm_flags, struct page **pages,
  +                           struct vm_area_struct **vma_prealloc)
   {
  +       int ret = 0;
  +       struct vm_area_struct *vma = *vma_prealloc;

(removed the "old" lines to make it more readable).

Why pass in "struct vm_area_struct **vma_prealloc" when you could just
pass in a plain and more readable "struct vm_area_struct *vma"?

My *guess* is that you originally cleared the vma_prealloc thing if
you used it, but in the patch you sent out you definitely don't (the
_only_ use of that "vma_prealloc" is the line that loads the content
into "vma", so this interface looks like it is some remnant of an
earlier and more complicated patch?

            Linus
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