From 6ca4f7494bde078b2b730e28e4ea1dc36a772f70 Mon Sep 17 00:00:00 2001 From: Hollis Blanchard Date: Wed, 26 Nov 2008 10:19:26 -0600 Subject: powerpc: Force memory size to be a multiple of PAGE_SIZE Ensure that total memory size is page-aligned, because otherwise mark_bootmem() gets upset. This error case was triggered by using 64 KiB pages in the kernel while arch/powerpc/boot/4xx.c arbitrarily reduced the amount of memory by 4096 (to work around a chip bug that affects the last 256 bytes of physical memory). Signed-off-by: Hollis Blanchard Signed-off-by: Paul Mackerras --- arch/powerpc/kernel/prom.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c index d8266dd61dda..6f73c739f1e2 100644 --- a/arch/powerpc/kernel/prom.c +++ b/arch/powerpc/kernel/prom.c @@ -1160,6 +1160,8 @@ static inline void __init phyp_dump_reserve_mem(void) {} void __init early_init_devtree(void *params) { + unsigned long limit; + DBG(" -> early_init_devtree(%p)\n", params); /* Setup flat device-tree pointer */ @@ -1200,7 +1202,19 @@ void __init early_init_devtree(void *params) early_reserve_mem(); phyp_dump_reserve_mem(); - lmb_enforce_memory_limit(memory_limit); + limit = memory_limit; + if (! limit) { + unsigned long memsize; + + /* Ensure that total memory size is page-aligned, because + * otherwise mark_bootmem() gets upset. */ + lmb_analyze(); + memsize = lmb_phys_mem_size(); + if ((memsize & PAGE_MASK) != memsize) + limit = memsize & PAGE_MASK; + } + lmb_enforce_memory_limit(limit); + lmb_analyze(); DBG("Phys. mem: %lx\n", lmb_phys_mem_size()); -- cgit v1.2.3