linux-kernel - Re: [PATCH v2] sparc64: Add support for Application Data Integrity (ADI)

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Message-ID: <56DDBBFD.8040106@intel.com>
Date:	Mon, 7 Mar 2016 09:35:57 -0800
From:	Dave Hansen <dave.hansen@...el.com>
To:	Khalid Aziz <khalid.aziz@...cle.com>, davem@...emloft.net,
	corbet@....net, akpm@...ux-foundation.org,
	dingel@...ux.vnet.ibm.com, zhenzhang.zhang@...wei.com,
	bob.picco@...cle.com, kirill.shutemov@...ux.intel.com,
	aneesh.kumar@...ux.vnet.ibm.com, aarcange@...hat.com,
	arnd@...db.de, sparclinux@...r.kernel.org
Cc:	rob.gardner@...cle.com, mhocko@...e.cz, chris.hyser@...cle.com,
	richard@....at, vbabka@...e.cz, koct9i@...il.com, oleg@...hat.com,
	gthelen@...gle.com, jack@...e.cz, xiexiuqi@...wei.com,
	Vineet.Gupta1@...opsys.com, luto@...nel.org, ebiederm@...ssion.com,
	bsegall@...gle.com, geert@...ux-m68k.org, dave@...olabs.net,
	adobriyan@...il.com, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-arch@...r.kernel.org, linux-api@...r.kernel.org
Subject: Re: [PATCH v2] sparc64: Add support for Application Data Integrity
 (ADI)

On 03/02/2016 12:39 PM, Khalid Aziz wrote:
> +long enable_sparc_adi(unsigned long addr, unsigned long len)
> +{
> +	unsigned long end, pagemask;
> +	int error;
> +	struct vm_area_struct *vma, *vma2;
> +	struct mm_struct *mm;
> +
> +	if (!ADI_CAPABLE())
> +		return -EINVAL;
...

This whole thing with the VMA splitting and so forth looks pretty darn
arch-independent.  Are you sure you need that much arch-specific code
for it, or can you share more of the generic VMA management code?