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Subject: Re: [RFC PATCH v2 2/3] mm: make pXd_addr_end() functions page-table
 entry aware
To:     Gerald Schaefer <gerald.schaefer@linux.ibm.com>,
        Jason Gunthorpe <jgg@ziepe.ca>,
        John Hubbard <jhubbard@nvidia.com>
Cc:     LKML <linux-kernel@vger.kernel.org>, linux-mm <linux-mm@kvack.org>,
        linux-arch <linux-arch@vger.kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
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        Will Deacon <will@kernel.org>,
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        Jeff Dike <jdike@addtoit.com>,
        Richard Weinberger <richard@nod.at>,
        Dave Hansen <dave.hansen@linux.intel.com>,
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        linux-x86 <x86@kernel.org>,
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        linux-power <linuxppc-dev@lists.ozlabs.org>,
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        Heiko Carstens <hca@linux.ibm.com>,
        Christian Borntraeger <borntraeger@de.ibm.com>,
        Claudio Imbrenda <imbrenda@linux.ibm.com>
References: <20200907180058.64880-1-gerald.schaefer@linux.ibm.com>
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From:   Dave Hansen <dave.hansen@intel.com>
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Message-ID: <8e28858d-e6a4-1c4f-4087-5f4a9719db94@intel.com>
Date:   Tue, 8 Sep 2020 07:33:24 -0700
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On 9/7/20 11:00 AM, Gerald Schaefer wrote:
> x86:
> add/remove: 0/0 grow/shrink: 2/0 up/down: 10/0 (10)
> Function                                     old     new   delta
> vmemmap_populate                             587     592      +5
> munlock_vma_pages_range                      556     561      +5
> Total: Before=15534694, After=15534704, chg +0.00%
...
>  arch/x86/mm/init_64.c                    | 15 ++++-----
>  arch/x86/mm/kasan_init_64.c              | 16 +++++-----

I didn't do a super thorough review on this, but it generally looks OK
and the benefits of sharing more code between arches certainly outweigh
a few bytes of binary growth.  For the x86 bits at least, feel free to
add my ack.