linux-kernel - Re: [PATCH] mm: provide a fallback for PAGE_KERNEL

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Message-ID: <20180509013935.GA8131@bombadil.infradead.org>
Date:   Tue, 8 May 2018 18:39:35 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     "Luis R. Rodriguez" <mcgrof@...nel.org>
Cc:     Tony Luck <tony.luck@...el.com>, arnd@...db.de,
        gregkh@...uxfoundation.org, linux-arch@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Fenghua Yu <fenghua.yu@...el.com>,
        linux-ia64@...r.kernel.org
Subject: Re: [PATCH] mm: provide a fallback for PAGE_KERNEL_RO for
 architectures

On Wed, May 09, 2018 at 01:04:38AM +0000, Luis R. Rodriguez wrote:
> On Fri, Apr 27, 2018 at 08:18:10PM -0700, Matthew Wilcox wrote:
> > ia64: Add PAGE_KERNEL_RO and PAGE_KERNEL_EXEC
> > 
> > The rest of the kernel was falling back to simple PAGE_KERNEL pages; using
> > PAGE_KERNEL_RO and PAGE_KERNEL_EXEC provide better protection against
> > unintended writes.
> > 
> > Signed-off-by: Matthew Wilcox <mawilcox@...rosoft.com>
> 
> Nice, should I queue this into my series as well?

A little reluctant to queue it without anyone having tested it.  Heck,
I didn't even check it compiled ;-)

We used to just break architectures and let them fix it up for this kind
of thing.  That's not really acceptable nowadays, but I don't know how
we get arch maintainers to fix up their ports now.