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 <paulus@samba.org>
Signed-off-by: Tony Breeds <tony@bakeyournoodle.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 9 insertions, 8 deletions

diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index df47316f1aee..32b5b05082ea 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -1224,14 +1224,6 @@ static void __init prom_init_mem(void)
 
         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
@@ -1269,6 +1261,15 @@ static void __init prom_init_mem(void)
         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));
         prom_printf("  alloc_bottom : %x\n", RELOC(alloc_bottom));