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>
diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index df47316..32b5b05 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -1224,14 +1224,6 @@
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 @@
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));