linux-kernel - Re: [PATCH 0/2] sh: get rid of __ARCH_USE_5LEVEL

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Message-ID: <20191217153651.GB4094@rapoport-lnx>
Date:   Tue, 17 Dec 2019 17:36:52 +0200
From:   Mike Rapoport <rppt@...nel.org>
To:     Rich Felker <dalias@...c.org>
Cc:     linux-sh@...r.kernel.org,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Mike Rapoport <rppt@...nel.org>
Subject: Re: [PATCH 0/2] sh: get rid of __ARCH_USE_5LEVEL_HACK

On Tue, Dec 17, 2019 at 10:15:49AM -0500, Rich Felker wrote:
> On Tue, Dec 17, 2019 at 04:21:48PM +0200, Mike Rapoport wrote:
> > From: Mike Rapoport <rppt@...ux.ibm.com>
> > 
> > Hi,
> > 
> > These patches update the SuperH page table folding/unfolding to take into
> > account the 5th level.
> 
> Is this only for 64-bit/sh5? If so, I'd really like to avoid having
> patch churn that nominally keeps it working, since it doesn't; GCC
> dropped support a long time ago and it was experimental to begin with,
> never appeared in production. Has anyone looked lately at what it
> would take to remove it?

This is a part of a generic cleanup of page table manipulations and removal
of __ARCH_USE_5LEVEL_HACK and the related code from the kernel. So this is
not related to a particular sh variant.
 
> Rich

-- 
Sincerely yours,
Mike.