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Date:   Wed, 7 Apr 2021 03:39:44 +0100
From:   Matthew Wilcox <willy@infradead.org>
To:     Michel Lespinasse <michel@lespinasse.org>
Cc:     Linux-MM <linux-mm@kvack.org>,
        Laurent Dufour <ldufour@linux.ibm.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Michal Hocko <mhocko@suse.com>,
        Rik van Riel <riel@surriel.com>,
        Paul McKenney <paulmck@kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Suren Baghdasaryan <surenb@google.com>,
        Joel Fernandes <joelaf@google.com>,
        Rom Lemarchand <romlem@google.com>,
        Linux-Kernel <linux-kernel@vger.kernel.org>
Subject: Re: [RFC PATCH 29/37] fs: list file types that support speculative
 faults.
Message-ID: <20210407023944.GZ2531743@casper.infradead.org>
References: <20210407014502.24091-1-michel@lespinasse.org>
 <20210407014502.24091-30-michel@lespinasse.org>
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On Tue, Apr 06, 2021 at 06:44:54PM -0700, Michel Lespinasse wrote:
> Add a speculative field to the vm_operations_struct, which indicates if
> the associated file type supports speculative faults.
> 
> Initially this is set for files that implement fault() with filemap_fault().

Ugh, no.  This goes away if you don't call ->fault speculatively.