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Date: Tue, 24 Jan 2017 13:28:49 -0800
From: Andrew Morton <akpm@linux-foundation.org>
To: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>,
        Hugh Dickins <hughd@google.com>, Rik van Riel <riel@redhat.com>,
        linux-mm@kvack.org, linux-kernel@vger.kernel.org,
        Oleg Nesterov <oleg@redhat.com>, Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH 01/12] uprobes: split THPs before trying replace them
Message-Id: <20170124132849.73135e8c6e9572be00dbbe79@linux-foundation.org>
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On Tue, 24 Jan 2017 19:28:13 +0300 "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> wrote:

> For THPs page_check_address() always fails. It's better to split them
> first before trying to replace.

So what does this mean.  uprobes simply fails to work when trying to
place a probe into a THP memory region?  How come nobody noticed (and
reported) this when using the feature?