linux-kernel - Re: [PATCH 09/16] sparc64: use the generic get_user_pages

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Date:   Sat, 10 Aug 2019 21:36:26 +0200
From:   Mikael Pettersson <mikpelinux@...il.com>
To:     Christoph Hellwig <hch@....de>
Cc:     Anatoly Pugachev <matorola@...il.com>,
        "Dmitry V. Levin" <ldv@...linux.org>,
        Khalid Aziz <khalid.aziz@...cle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "David S. Miller" <davem@...emloft.net>,
        Sparc kernel list <sparclinux@...r.kernel.org>,
        linux-mm@...ck.org,
        Linux Kernel list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 09/16] sparc64: use the generic get_user_pages_fast code

For the record the futex test case OOPSes a 5.3-rc3 kernel running on
a Sun Blade 2500 (2 x USIIIi).  This system runs a custom distro with
a custom toolchain (gcc-8.3 based), so I doubt it's a distro problem.

On Sat, Aug 10, 2019 at 9:17 AM Christoph Hellwig <hch@....de> wrote:
>
> There isn't really a way to use an arch-specific get_user_pages_fast
> in mainline, you'd need to revert the whole series.  As a relatively
> quick workaround you can just remove the
>
>         select HAVE_FAST_GUP if SPARC64
>
> line from arch/sparc/Kconfig