linux-kernel - Re: [PATCH 07/32] mm: Bring back vmalloc

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Message-ID: <ZFq3SdSBJ_LWsOgd@murray>
Date:   Tue, 9 May 2023 14:12:41 -0700
From:   Lorenzo Stoakes <lstoakes@...il.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Kent Overstreet <kent.overstreet@...ux.dev>,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-bcachefs@...r.kernel.org,
        Kent Overstreet <kent.overstreet@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Uladzislau Rezki <urezki@...il.com>, linux-mm@...ck.org
Subject: Re: [PATCH 07/32] mm: Bring back vmalloc_exec

On Tue, May 09, 2023 at 01:46:09PM -0700, Christoph Hellwig wrote:
> On Tue, May 09, 2023 at 12:56:32PM -0400, Kent Overstreet wrote:
> > From: Kent Overstreet <kent.overstreet@...il.com>
> >
> > This is needed for bcachefs, which dynamically generates per-btree node
> > unpack functions.
>
> No, we will never add back a way for random code allocating executable
> memory in kernel space.

Yeah I think I glossed over this aspect a bit as it looks ostensibly like simply
reinstating a helper function because the code is now used in more than one
place (at lsf/mm so a little distracted :)

But it being exported is a problem. Perhaps there's another way of acheving the
same aim without having to do so?