linux-kernel - Re: [PATCH 0/3] mm/mmap.c: don't unmap the overlapping VMA(s)

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Message-ID: <20160402215430.GA100607@black.fi.intel.com>
Date:	Sun, 3 Apr 2016 00:54:30 +0300
From:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:	Piotr Kwapulinski <kwapulinski.piotr@...il.com>
Cc:	akpm@...ux-foundation.org, mhocko@...e.com, mtk.manpages@...il.com,
	cmetcalf@...lanox.com, arnd@...db.de, viro@...iv.linux.org.uk,
	mszeredi@...e.cz, dave@...olabs.net, vbabka@...e.cz,
	mingo@...nel.org, dan.j.williams@...el.com,
	dave.hansen@...ux.intel.com, koct9i@...il.com, hannes@...xchg.org,
	jack@...e.cz, xiexiuqi@...wei.com, iamjoonsoo.kim@....com,
	oleg@...hat.com, gang.chen.5i5j@...il.com, aarcange@...hat.com,
	aryabinin@...tuozzo.com, rientjes@...gle.com, denc716@...il.com,
	toshi.kani@....com, ldufour@...ux.vnet.ibm.com,
	kuleshovmail@...il.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, linux-arch@...r.kernel.org
Subject: Re: [PATCH 0/3] mm/mmap.c: don't unmap the overlapping VMA(s)

On Sat, Apr 02, 2016 at 09:17:31PM +0200, Piotr Kwapulinski wrote:
> @@ -19,6 +19,7 @@
>  #define MAP_TYPE	0x0f		/* Mask for type of mapping */
>  #define MAP_FIXED	0x10		/* Interpret addr exactly */
>  #define MAP_ANONYMOUS	0x20		/* don't use a file */
> +#define MAP_DONTUNMAP	0x40		/* don't unmap overlapping VMA */

NAK.

arch/powerpc/include/uapi/asm/mman.h:#define MAP_NORESERVE   0x40            /* don't reserve swap pages */
arch/sparc/include/uapi/asm/mman.h:#define MAP_NORESERVE   0x40            /* don't reserve swap pages */
arch/x86/include/uapi/asm/mman.h:#define MAP_32BIT      0x40            /* only give out 32bit addresses */

-- 
 Kirill A. Shutemov