linux-kernel - Re: [PATCH v3] kcov: don't generate a warning on vm_insert

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Message-Id: <20220414142457.d22ce3a11920dc943001d737@linux-foundation.org>
Date:   Thu, 14 Apr 2022 14:24:57 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Aleksandr Nogikh <nogikh@...gle.com>
Cc:     kasan-dev@...glegroups.com, linux-kernel@...r.kernel.org,
        dvyukov@...gle.com, andreyknvl@...il.com, elver@...gle.com,
        glider@...gle.com, tarasmadan@...gle.com, bigeasy@...utronix.de
Subject: Re: [PATCH v3] kcov: don't generate a warning on vm_insert_page()'s
 failure

On Fri,  1 Apr 2022 18:25:12 +0000 Aleksandr Nogikh <nogikh@...gle.com> wrote:

> vm_insert_page()'s failure is not an unexpected condition, so don't do
> WARN_ONCE() in such a case.
> 
> Instead, print a kernel message and just return an error code.

(hm, I thought I asked this before but I can't find it)

Under what circumstances will this failure occur?

Why do we emit a message at all?  What action can the user take upon
seeing the message?

Do we have a Fixes: for this?

>From the info provided thus far I'm unable to determine whether a
-stable backport is needed.  What are your thoughts on this?