From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <owner-linux-mm@kvack.org>
Received: from mail-qk0-f199.google.com (mail-qk0-f199.google.com [209.85.220.199])
	by kanga.kvack.org (Postfix) with ESMTP id B7ACB6B0388
	for <linux-mm@kvack.org>; Thu, 16 Mar 2017 08:28:18 -0400 (EDT)
Received: by mail-qk0-f199.google.com with SMTP id f191so36268774qka.7
        for <linux-mm@kvack.org>; Thu, 16 Mar 2017 05:28:18 -0700 (PDT)
Received: from mx1.redhat.com (mx1.redhat.com. [209.132.183.28])
        by mx.google.com with ESMTPS id f36si3758268qtb.215.2017.03.16.05.28.17
        for <linux-mm@kvack.org>
        (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128);
        Thu, 16 Mar 2017 05:28:17 -0700 (PDT)
Subject: Re: [RFC PATCH v2 14/32] x86: mm: Provide support to use memblock
 when spliting large pages
References: <148846752022.2349.13667498174822419498.stgit@brijesh-build-machine>
 <148846771545.2349.9373586041426414252.stgit@brijesh-build-machine>
From: Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <55f528b7-da06-2506-2cd0-56b9493347f0@redhat.com>
Date: Thu, 16 Mar 2017 13:28:01 +0100
MIME-Version: 1.0
In-Reply-To: <148846771545.2349.9373586041426414252.stgit@brijesh-build-machine>
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit
Sender: owner-linux-mm@kvack.org
List-ID: <linux-mm.kvack.org>
To: Brijesh Singh <brijesh.singh@amd.com>, simon.guinot@sequanux.org, linux-efi@vger.kernel.org, kvm@vger.kernel.org, rkrcmar@redhat.com, matt@codeblueprint.co.uk, linux-pci@vger.kernel.org, linus.walleij@linaro.org, gary.hook@amd.com, linux-mm@kvack.org, paul.gortmaker@windriver.com, hpa@zytor.com, cl@linux.com, dan.j.williams@intel.com, aarcange@redhat.com, sfr@canb.auug.org.au, andriy.shevchenko@linux.intel.com, herbert@gondor.apana.org.au, bhe@redhat.com, xemul@parallels.com, joro@8bytes.org, x86@kernel.org, peterz@infradead.org, piotr.luc@intel.com, mingo@redhat.com, msalter@redhat.com, ross.zwisler@linux.intel.com, bp@suse.de, dyoung@redhat.com, thomas.lendacky@amd.com, jroedel@suse.de, keescook@chromium.org, arnd@arndb.de, toshi.kani@hpe.com, mathieu.desnoyers@efficios.com, luto@kernel.org, devel@linuxdriverproject.org, bhelgaas@google.com, tglx@linutronix.de, mchehab@kernel.org, iamjoonsoo.kim@lge.com, labbott@fedoraproject.org, tony.luck@intel.com, alexandre.bounine@idt.com, kuleshovmail@gmail.com, linux-kernel@vger.kernel.org, mcgrof@kernel.org, mst@redhat.com, linux-crypto@vger.kernel.org, tj@kernel.org, akpm@linux-foundation.org, davem@davemloft.net



On 02/03/2017 16:15, Brijesh Singh wrote:
> 
>  __split_large_page(struct cpa_data *cpa, pte_t *kpte, unsigned long address,
> -		   struct page *base)
> +		  pte_t *pbase, unsigned long new_pfn)
>  {
> -	pte_t *pbase = (pte_t *)page_address(base);

Just one comment and I'll reply to Boris, I think you can compute pbase 
with pfn_to_kaddr, and avoid adding a new argument.

>  	 */
> -	__set_pmd_pte(kpte, address, mk_pte(base, __pgprot(_KERNPG_TABLE)));
> +	__set_pmd_pte(kpte, address,
> +		native_make_pte((new_pfn << PAGE_SHIFT) + _KERNPG_TABLE));

And this probably is better written as:

	__set_pmd_pte(kpte, address, pfn_pte(new_pfn, __pgprot(_KERNPG_TABLE));

Paolo

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>