From: Steve Muckle <smuckle@xxxxxxxxxxxxxx> Some SMP configurations start all available cores in parallel through the kernel entrypoint, rather than secondary CPUs waiting to be brought out of reset into machine specific startup code. Signed-off-by: Steve Muckle <smuckle@xxxxxxxxxxxxxx> --- arch/arm/Kconfig | 9 +++++++++ arch/arm/kernel/head.S | 3 +++ 2 files changed, 12 insertions(+), 0 deletions(-) diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 021b1d5..39103d2 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1020,6 +1020,15 @@ config NR_CPUS depends on SMP default "4" +config SMP_PARALLEL_START + bool "Parallel start of SMP cores" + depends on SMP + default n + help + Say Y here if all CPUs boot to the kernel entrypoint in + parallel, rather than non-master CPUs waiting to be brought + out of reset into machine specific startup code. + config HOTPLUG_CPU bool "Support for hot-pluggable CPUs (EXPERIMENTAL)" depends on SMP && HOTPLUG && EXPERIMENTAL diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S index 4946c72..9730b7a 100644 --- a/arch/arm/kernel/head.S +++ b/arch/arm/kernel/head.S @@ -78,6 +78,9 @@ ENTRY(stext) setmode PSR_F_BIT | PSR_I_BIT | SVC_MODE, r9 @ ensure svc mode @ and irqs disabled +#ifdef CONFIG_SMP_PARALLEL_START + bl __smp_secondary_spin +#endif mrc p15, 0, r9, c0, c0 @ get processor id bl __lookup_processor_type @ r5=procinfo r9=cpuid movs r10, r5 @ invalid processor (r5=0)? -- 1.7.1 -- Sent by a consultant of the Qualcomm Innovation Center, Inc. The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum. -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
