linux-kernel - Re: [PATCH 2/2] mm: remove get_user_pages

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Message-ID: <cc508436-156e-eb4b-ae01-b44f33c2d692@redhat.com>
Date:   Mon, 31 Oct 2016 12:45:36 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Lorenzo Stoakes <lstoakes@...il.com>, linux-mm@...ck.org
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Michal Hocko <mhocko@...nel.org>, Jan Kara <jack@...e.cz>,
        Hugh Dickins <hughd@...gle.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Rik van Riel <riel@...hat.com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, linux-cris-kernel@...s.com,
        linux-ia64@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-rdma@...r.kernel.org, kvm@...r.kernel.org,
        linux-media@...r.kernel.org, devel@...verdev.osuosl.org
Subject: Re: [PATCH 2/2] mm: remove get_user_pages_locked()



On 31/10/2016 11:02, Lorenzo Stoakes wrote:
> - *
> - * get_user_pages should be phased out in favor of
> - * get_user_pages_locked|unlocked or get_user_pages_fast. Nothing
> - * should use get_user_pages because it cannot pass
> - * FAULT_FLAG_ALLOW_RETRY to handle_mm_fault.

This comment should be preserved in some way.  In addition, removing
get_user_pages_locked() makes it harder (compared to a simple "git grep
-w") to identify callers that lack allow-retry functionality).  So I'm
not sure about the benefits of these patches.

If all callers were changed, then sure removing the _locked suffix would
be a good idea.

Paolo