linux-kernel - Re: [PATCH 1/2] mm: Make follow_pte

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Message-ID: <20171221212943.GB9087@linux.intel.com>
Date:   Thu, 21 Dec 2017 14:29:43 -0700
From:   Ross Zwisler <ross.zwisler@...ux.intel.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     linux-kernel@...r.kernel.org,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        Dave Hansen <dave.hansen@...el.com>, linux-mm@...ck.org,
        Josh Triplett <josh@...htriplett.org>,
        Matthew Wilcox <mawilcox@...rosoft.com>
Subject: Re: [PATCH 1/2] mm: Make follow_pte_pmd an inline

On Tue, Dec 19, 2017 at 08:58:22AM -0800, Matthew Wilcox wrote:
> From: Matthew Wilcox <mawilcox@...rosoft.com>
> 
> The one user of follow_pte_pmd (dax) emits a sparse warning because
> it doesn't know that follow_pte_pmd conditionally returns with the
> pte/pmd locked.  The required annotation is already there; it's just
> in the wrong file.

Can you help me find the required annotation that is already there but in the
wrong file?

This does seem to quiet a lockep warning in fs/dax.c, but I think we still
have a related one in mm/memory.c:

mm/memory.c:4204:5: warning: context imbalance in '__follow_pte_pmd' - different lock contexts for basic block

Should we deal with this one as well?