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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>
This commit is contained in:
Paul Mackerras 2011-12-13 17:54:13 +00:00 committed by Benjamin Herrenschmidt
parent b206590c04
commit 64968f60e7
1 changed files with 9 additions and 8 deletions
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17
arch/powerpc/kernel/prom_init.c
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@ -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));