[PATCH] x86/fpu: Remove the _GPL from the kernel_fpu_begin/end() export

From: Andy Lutomirski
Date: Thu May 02 2019 - 10:42:37 EST

The FPU is not a super-Linuxy internal detail, so remove the _GPL
from its export. Without something like this patch, it's impossible
for even highly license-respecting non-GPL modules to use the FPU,
which seems silly to me. After all, the FPU is a CPU feature, not
really a kernel feature at all.

Cc: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Cc:: Borislav Petkov <bp@xxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: "Jason A. Donenfeld" <Jason@xxxxxxxxx>
Cc: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Nicolai Stange <nstange@xxxxxxx>
Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Cc: Radim KrÄmÃÅ <rkrcmar@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: x86@xxxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx
Fixes: 12209993e98c ("x86/fpu: Don't export __kernel_fpu_{begin,end}()")
Signed-off-by: Andy Lutomirski <luto@xxxxxxxxxx>

This fixes a genuine annoyance for ZFS on Linux. Regardless of what
one may think about the people who distribute ZFS on Linux
*binaries*, as far as I know, the source and the users who build it
themselves are entirely respectful of everyone's license. I have no
problem with EXPORT_SYMBOL_GPL() in general, but let's please avoid
using it for things that aren't fundamentally Linux internals.

arch/x86/kernel/fpu/core.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/fpu/core.c b/arch/x86/kernel/fpu/core.c
index 2e5003fef51a..8de5687a470d 100644
--- a/arch/x86/kernel/fpu/core.c
+++ b/arch/x86/kernel/fpu/core.c
@@ -127,14 +127,14 @@ void kernel_fpu_begin(void)

void kernel_fpu_end(void)

* Save the FPU state (mark it for reload if necessary):