powerpc/64s: Remove unneeded #ifdef CONFIG_DEBUG_PAGEALLOC in hash_utils

debug_pagealloc_enabled() is always defined and constant folds to
'false' when CONFIG_DEBUG_PAGEALLOC is not enabled.

Remove the #ifdefs, the code and associated static variables will
be optimised out by the compiler when CONFIG_DEBUG_PAGEALLOC is
not defined.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Nicholas Miehlbradt <nicholas@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220926075726.2846-2-nicholas@linux.ibm.com

arch/powerpc/mm/book3s64/hash_utils.c

@@ -123,11 +123,8 @@ EXPORT_SYMBOL_GPL(mmu_slb_size);
 #ifdef CONFIG_PPC_64K_PAGES
 int mmu_ci_restrictions;
 #endif
-#ifdef CONFIG_DEBUG_PAGEALLOC
 static u8 *linear_map_hash_slots;
 static unsigned long linear_map_hash_count;
-static DEFINE_SPINLOCK(linear_map_hash_lock);
-#endif /* CONFIG_DEBUG_PAGEALLOC */
 struct mmu_hash_ops mmu_hash_ops;
 EXPORT_SYMBOL(mmu_hash_ops);
 
@@ -427,11 +424,9 @@ int htab_bolt_mapping(unsigned long vstart, unsigned long vend,
 			break;
 
 		cond_resched();
-#ifdef CONFIG_DEBUG_PAGEALLOC
 		if (debug_pagealloc_enabled() &&
 			(paddr >> PAGE_SHIFT) < linear_map_hash_count)
 			linear_map_hash_slots[paddr >> PAGE_SHIFT] = ret | 0x80;
-#endif /* CONFIG_DEBUG_PAGEALLOC */
 	}
 	return ret < 0 ? ret : 0;
 }
@@ -1066,7 +1061,6 @@ static void __init htab_initialize(void)
 
 	prot = pgprot_val(PAGE_KERNEL);
 
-#ifdef CONFIG_DEBUG_PAGEALLOC
 	if (debug_pagealloc_enabled()) {
 		linear_map_hash_count = memblock_end_of_DRAM() >> PAGE_SHIFT;
 		linear_map_hash_slots = memblock_alloc_try_nid(
@@ -1076,7 +1070,6 @@ static void __init htab_initialize(void)
 			panic("%s: Failed to allocate %lu bytes max_addr=%pa\n",
 			      __func__, linear_map_hash_count, &ppc64_rma_size);
 	}
-#endif /* CONFIG_DEBUG_PAGEALLOC */
 
 	/* create bolted the linear mapping in the hash table */
 	for_each_mem_range(i, &base, &end) {
@@ -1988,6 +1981,8 @@ long hpte_insert_repeating(unsigned long hash, unsigned long vpn,
 }
 
 #ifdef CONFIG_DEBUG_PAGEALLOC
+static DEFINE_SPINLOCK(linear_map_hash_lock);
+
 static void kernel_map_linear_page(unsigned long vaddr, unsigned long lmi)
 {
 	unsigned long hash;