From: Anton Blanchard Date: Thu, 17 Jun 2010 14:33:06 +0000 (+0000) Subject: powerpc: Linux cannot run with 0 cores X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=33ad5e4b6cab3ad8cf3afda49b66393f1833150e;p=deliverable%2Flinux.git 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 Acked-by: Paul E. McKenney Signed-off-by: Benjamin Herrenschmidt --- diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c index 97d4bd9442d3..3b6f8ae9b8cc 100644 --- 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); }