powerpc: Only use initrd_end as the limit for alloc_bottom if it's inside the RMO.

As the kernels and initrd's get bigger boot-loaders and possibly
kexec-tools will need to place the initrd outside the RMO. When this
happens we end up with no lowmem and the boot doesn't get very far.

Only use initrd_end as the limit for alloc_bottom if it's inside the
RMO.

Signed-off-by: Paul Mackerras <[e-mail]>
Signed-off-by: Tony Breeds <[e-mail]>
Signed-off-by: Benjamin Herrenschmidt <[e-mail]>

arch/powerpc/kernel/prom_init.c

···
 
 	RELOC(alloc_bottom) = PAGE_ALIGN((unsigned long)&RELOC(_end) + 0x4000);
 
-	/* Check if we have an initrd after the kernel, if we do move our bottom
-	 * point to after it
-	 */
-	if (RELOC(prom_initrd_start)) {
-		if (RELOC(prom_initrd_end) > RELOC(alloc_bottom))
-			RELOC(alloc_bottom) = PAGE_ALIGN(RELOC(prom_initrd_end));
-	}
-
 	/*
 	 * If prom_memory_limit is set we reduce the upper limits *except* for
 	 * alloc_top_high. This must be the real top of RAM so we can put
···
 	RELOC(rmo_top) = min(0x30000000ul, RELOC(rmo_top));
 	RELOC(alloc_top) = RELOC(rmo_top);
 	RELOC(alloc_top_high) = RELOC(ram_top);
+
+	/*
+	 * Check if we have an initrd after the kernel but still inside
+	 * the RMO.  If we do move our bottom point to after it.
+	 */
+	if (RELOC(prom_initrd_start) &&
+	    RELOC(prom_initrd_start) < RELOC(rmo_top) &&
+	    RELOC(prom_initrd_end) > RELOC(alloc_bottom))
+		RELOC(alloc_bottom) = PAGE_ALIGN(RELOC(prom_initrd_end));
 
 	prom_printf("memory layout at init:\n");
 	prom_printf("  memory_limit : %x (16 MB aligned)\n", RELOC(prom_memory_limit));