linux-kernel - Re: [PATCHv12 25/37] mm, thp: remove infrastructure for handling splitting PMDs

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Message-ID: <20151009092559.GA7346@node>
Date:	Fri, 9 Oct 2015 12:25:59 +0300
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
Cc:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Hugh Dickins <hughd@...gle.com>,
	Dave Hansen <dave.hansen@...el.com>,
	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Christoph Lameter <cl@...two.org>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Steve Capper <steve.capper@...aro.org>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>,
	Jerome Marchand <jmarchan@...hat.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCHv12 25/37] mm, thp: remove infrastructure for handling
 splitting PMDs

On Thu, Oct 08, 2015 at 02:22:25PM +0530, Vineet Gupta wrote:
> On Tuesday 06 October 2015 08:53 PM, Kirill A. Shutemov wrote:
> > With new refcounting we don't need to mark PMDs splitting. Let's drop code
> > to handle this.
> > 
> ....
> >  
> > diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
> > index 29c57b2cb344..010a7e3f6ad1 100644
> > --- a/include/asm-generic/pgtable.h
> > +++ b/include/asm-generic/pgtable.h
> > @@ -184,11 +184,6 @@ static inline void pmdp_set_wrprotect(struct mm_struct *mm,
> >  #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
> >  #endif
> >  
> > -#ifndef __HAVE_ARCH_PMDP_SPLITTING_FLUSH
> > -extern void pmdp_splitting_flush(struct vm_area_struct *vma,
> > -				 unsigned long address, pmd_t *pmdp);
> > -#endif
> 
> 
> Hi Kirill,
> 
> While at it - you would also want to nuke
> 
> Documentation/features/vm/pmdp_splitting_flush/

Sure.

The patch below can be folded into this one.

diff --git a/Documentation/features/vm/pmdp_splitting_flush/arch-support.txt b/Documentation/features/vm/pmdp_splitting_flush/arch-support.txt
deleted file mode 100644
index 26f74b457e0b..000000000000
--- a/Documentation/features/vm/pmdp_splitting_flush/arch-support.txt
+++ /dev/null
@@ -1,40 +0,0 @@
-#
-# Feature name:          pmdp_splitting_flush
-#         Kconfig:       __HAVE_ARCH_PMDP_SPLITTING_FLUSH
-#         description:   arch supports the pmdp_splitting_flush() VM API
-#
-    -----------------------
-    |         arch |status|
-    -----------------------
-    |       alpha: | TODO |
-    |         arc: | TODO |
-    |         arm: |  ok  |
-    |       arm64: |  ok  |
-    |       avr32: | TODO |
-    |    blackfin: | TODO |
-    |         c6x: | TODO |
-    |        cris: | TODO |
-    |         frv: | TODO |
-    |       h8300: | TODO |
-    |     hexagon: | TODO |
-    |        ia64: | TODO |
-    |        m32r: | TODO |
-    |        m68k: | TODO |
-    |       metag: | TODO |
-    |  microblaze: | TODO |
-    |        mips: |  ok  |
-    |     mn10300: | TODO |
-    |       nios2: | TODO |
-    |    openrisc: | TODO |
-    |      parisc: | TODO |
-    |     powerpc: |  ok  |
-    |        s390: |  ok  |
-    |       score: | TODO |
-    |          sh: | TODO |
-    |       sparc: | TODO |
-    |        tile: | TODO |
-    |          um: | TODO |
-    |   unicore32: | TODO |
-    |         x86: |  ok  |
-    |      xtensa: | TODO |
-    -----------------------
-- 
 Kirill A. Shutemov
--
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