powerpc: Linux cannot run with 0 cores

If we configure with CONFIG_SMP=n or set NR_CPUS less than the number of
SMT threads we will set the max cores property to 0 in the
ibm,client-architecture-support structure. On new versions of firmware that
understand this property it obliges and terminates our partition.

Use DIV_ROUND_UP so we handle not only the CONFIG_SMP=n case but also the
case where NR_CPUS isn't a multiple of the number of SMT threads.

Signed-off-by: Anton Blanchard <anton@samba.org>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.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 97d4bd9..3b6f8ae 100644 (file)
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -872,7 +872,7 @@ static void __init prom_send_capabilities(void)
                                    "ibm_architecture_vec structure inconsistent: 0x%x !\n",
                                    *cores);
                } else {
-                       *cores = NR_CPUS / prom_count_smt_threads();
+                       *cores = DIV_ROUND_UP(NR_CPUS, prom_count_smt_threads());
                        prom_printf("Max number of cores passed to firmware: 0x%x\n",
                                    (unsigned long)*cores);
                }