powerpc: Export mmu_feature_keys[] as non-GPL

BugLink: https://bugs.launchpad.net/bugs/1976248
When the mmu_feature_keys[] was introduced in the commit c12e6f24d413
("powerpc: Add option to use jump label for mmu_has_feature()"),
it is unlikely that it would be used either directly or indirectly in
the out of tree modules. So we exported it as GPL only.

But with the evolution of the codes, especially the PPC_KUAP support, it
may be indirectly referenced by some primitive macro or inline functions
such as get_user() or __copy_from_user_inatomic(), this will make it
impossible to build many non GPL modules (such as ZFS) on ppc
architecture. Fix this by exposing the mmu_feature_keys[] to the non-GPL
modules too.

Fixes: 7613f5a66bec ("powerpc/64s/kuap: Use mmu_has_feature()")
Reported-by: Nathaniel Filardo <nwfilardo@gmail.com>
Signed-off-by: Kevin Hao <haokexin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220329085709.4132729-1-haokexin@gmail.com
(backported from commit d9e5c3e9e75162f845880535957b7fd0b4637d23 upstream)
Signed-off-by: Dimitri John Ledkov <dimitri.ledkov@canonical.com>
Acked-by: Cengiz Can <cengiz.can@canonical.com>
Acked-by: Andrea Righi <andrea.righi@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

diff --git a/arch/powerpc/kernel/cputable.c b/arch/powerpc/kernel/cputable.c
index ae0fdef0ac1156c120c40ebc591c90898a13043f..3a8cd40b636851c7db52264a05442ef6e1f36fab 100644 (file)
--- a/arch/powerpc/kernel/cputable.c
+++ b/arch/powerpc/kernel/cputable.c
@@ -2119,7 +2119,7 @@ void __init cpu_feature_keys_init(void)
 struct static_key_true mmu_feature_keys[NUM_MMU_FTR_KEYS] = {
                        [0 ... NUM_MMU_FTR_KEYS - 1] = STATIC_KEY_TRUE_INIT
 };
-EXPORT_SYMBOL_GPL(mmu_feature_keys);
+EXPORT_SYMBOL(mmu_feature_keys);
 
 void __init mmu_feature_keys_init(void)
 {