powerpc/8xx: Fixing memory init issue with CONFIG_PIN_TLB

Activating CONFIG_PIN_TLB allows access to the 24 first Mbytes of
memory at bootup instead of 8.  It is needed for "big" kernels for
instance when activating CONFIG_LOCKDEP_SUPPORT.  This needs to be
taken into account in init_32 too, otherwise memory allocation soon
fails after startup.
Signed-off-by: NChristophe Leroy <christophe.leroy@c-s.fr>
Acked-by: NJoakim Tjernlund <Joakim.Tjernlund@transmode.se>
Signed-off-by: NScott Wood <scottwood@freescale.com>

arch/powerpc/mm/init_32.c

@@ -213,7 +213,12 @@ void setup_initial_memory_limit(phys_addr_t first_memblock_base,
 	 */
 	BUG_ON(first_memblock_base != 0);
 
+#ifdef CONFIG_PIN_TLB
+	/* 8xx can only access 24MB at the moment */
+	memblock_set_current_limit(min_t(u64, first_memblock_size, 0x01800000));
+#else
 	/* 8xx can only access 8MB at the moment */
 	memblock_set_current_limit(min_t(u64, first_memblock_size, 0x00800000));
+#endif
 }
 #endif /* CONFIG_8xx */