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

Message ID 20170722011741.13942-6-npiggin@gmail.com (mailing list archive)
State Superseded
Headers show

Commit Message

Nicholas Piggin July 22, 2017, 1:17 a.m. UTC 
These are unused in radix mode.

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

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