Christophe Leroy feb8e960d7 powerpc/mm: Fix CONFIG_PPC_KUAP_DEBUG on PPC32
CONFIG_PPC_KUAP_DEBUG is not selectable because it depends on PPC_32
which doesn't exists.

Fixing it leads to a deadlock due to a vital register getting
clobbered in _switch().

Change dependency to PPC32 and use r0 instead of r4 in _switch()

Fixes: e2fb9f544431 ("powerpc/32: Prepare for Kernel Userspace Access Protection")
Cc: stable@vger.kernel.org # v5.2+
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/540242f7d4573f7cdf1b3bf46bb35f743b2cd68f.1587124651.git.christophe.leroy@c-s.fr
2020-04-22 20:24:02 +10:00
..
2019-08-27 13:03:33 +10:00
2019-07-13 16:08:36 -07:00
2019-11-21 15:41:34 +11:00
2020-04-05 11:12:59 -07:00
2020-04-09 11:01:42 -07:00
2020-04-09 11:01:42 -07:00
2020-04-09 11:01:42 -07:00