[RFC PATCH 05/11] powerpc/64s/radix: Do not allocate SLB shadow structures

[Nicholas Piggin]

These are unused in radix mode.

Signed-off-by: Nicholas Piggin <npig...@gmail.com>
---
 arch/powerpc/kernel/paca.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/paca.c b/arch/powerpc/kernel/paca.c
index fd7deb79110a..032b073c2c30 100644
--- a/arch/powerpc/kernel/paca.c
+++ b/arch/powerpc/kernel/paca.c
@@ -104,13 +104,22 @@ static struct slb_shadow *slb_shadow;
 static void __init allocate_slb_shadows(int nr_cpus, int limit)
 {
        int size = PAGE_ALIGN(sizeof(struct slb_shadow) * nr_cpus);
+
+       if (early_radix_enabled())
+               return;
+
        slb_shadow = __va(memblock_alloc_base(size, PAGE_SIZE, limit));
        memset(slb_shadow, 0, size);
 }
 
 static struct slb_shadow * __init init_slb_shadow(int cpu)
 {
-       struct slb_shadow *s = &slb_shadow[cpu];
+       struct slb_shadow *s;
+
+       if (early_radix_enabled())
+               return NULL;
+
+       s = &slb_shadow[cpu];
 
        /*
         * When we come through here to initialise boot_paca, the slb_shadow
-- 
2.11.0