Re: x86/fpu: Don't export __kernel_fpu_{begin,end}()

[Sebastian Andrzej Siewior]

On 2019-01-10 17:32:58 [+0000], Hutter, Tony wrote:
> > 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:

So btrfs uses crc32c() / kernel's crypto API for that and ZFS can't?
Well the crypto API is GPL only exported so that won't work. crc32c() is
EXPORT_SYMBOL() so it would work.
On the other hand it does not look right to provide a EXPORT_SYMBOL
wrapper around a GPL only interfaceâ

Sebastian