linux-kernel - Re: [PATCH v2] vmalloc: Fix issues with flush flag

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Message-Id: <20190520.184336.743103388474716249.davem@davemloft.net>
Date:   Mon, 20 May 2019 18:43:36 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     rick.p.edgecombe@...el.com
Cc:     linux-kernel@...r.kernel.org, peterz@...radead.org,
        linux-mm@...ck.org, mroos@...ux.ee, mingo@...hat.com,
        namit@...are.com, luto@...nel.org, bp@...en8.de,
        netdev@...r.kernel.org, dave.hansen@...el.com,
        sparclinux@...r.kernel.org
Subject: Re: [PATCH v2] vmalloc: Fix issues with flush flag

From: "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
Date: Tue, 21 May 2019 01:20:33 +0000

> Should it handle executing an unmapped page gracefully? Because this
> change is causing that to happen much earlier. If something was relying
> on a cached translation to execute something it could find the mapping
> disappear.

Does this work by not mapping any kernel mappings at the beginning,
and then filling in the BPF mappings in response to faults?