powerpc/configs/64s: Enable DEBUG_VM & other options

Fedora enables DEBUG_VM, which has led to occasions where a VM_BUG_ON()
is not caught by upstream testing, but rather is first found in Fedora,
which is not how it's meant to be.

PAGE_OWNER & PAGE_POISONING both need to be enabled on the kernel
command line, so should not add much overhead in normal operation.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230414132415.821564-20-mpe@ellerman.id.au

arch/powerpc/configs/ppc64_defconfig

@@ -397,14 +397,20 @@ CONFIG_PRINTK_TIME=y
 CONFIG_PRINTK_CALLER=y
 CONFIG_DEBUG_KERNEL=y
 CONFIG_MAGIC_SYSRQ=y
+CONFIG_PAGE_OWNER=y
+CONFIG_PAGE_POISONING=y
 CONFIG_DEBUG_RODATA_TEST=y
+CONFIG_DEBUG_WX=y
 CONFIG_DEBUG_STACK_USAGE=y
+CONFIG_DEBUG_VM=y
+# CONFIG_DEBUG_VM_PGTABLE is not set
 CONFIG_DEBUG_STACKOVERFLOW=y
 CONFIG_SOFTLOCKUP_DETECTOR=y
 CONFIG_HARDLOCKUP_DETECTOR=y
 CONFIG_DEBUG_MUTEXES=y
 CONFIG_FUNCTION_TRACER=y
 CONFIG_LOCK_TORTURE_TEST=m
+CONFIG_BUG_ON_DATA_CORRUPTION=y
 CONFIG_STACK_TRACER=y
 CONFIG_SCHED_TRACER=y
 CONFIG_FTRACE_SYSCALLS=y