linux-kernel - Re: x86/fpu: Don't export __kernel_fpu

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Date:   Thu, 10 Jan 2019 17:32:58 +0000
From:   "Hutter, Tony" <hutter2@...l.gov>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>
CC:     Marc Dionne <marc.c.dionne@...il.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>
Subject: Re: x86/fpu: Don't export __kernel_fpu_{begin,end}()

> But since when did out-of-tree modules use __kernel_fpu_begin?  It's an
> x86-only thing, and shouldn't really be used by anyone, right?

ZFS on Linux uses it for checksums.  Its removal is currently breaking ZFS builds against 5.0:

https://github.com/zfsonlinux/zfs/issues/8259#issuecomment-452902510