linux-kernel - Re: [PATCH 01/12] uprobes: split THPs before trying replace them

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

On Tue, 24 Jan 2017 19:28:13 +0300 "Kirill A. Shutemov" <kirill.shutemov@...ux.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?