From 6422a913856716be080dba4c2cb9d083d4e244ed Mon Sep 17 00:00:00 2001 From: Paul Burton Date: Wed, 3 Feb 2016 03:15:34 +0000 Subject: [PATCH] MIPS: smp-cps: Add nothreads kernel parameter When debugging a new system or core it can be useful to disable the use of multithreading. Introduce a "nothreads" kernel command line parameter that can be set in order to do so. Signed-off-by: Paul Burton Cc: Matt Redfearn Cc: Rusty Russell Cc: Niklas Cassel Cc: Ezequiel Garcia Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/12340/ Signed-off-by: Ralf Baechle --- arch/mips/kernel/smp-cps.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/arch/mips/kernel/smp-cps.c b/arch/mips/kernel/smp-cps.c index 0651217..1061bd2 100644 --- a/arch/mips/kernel/smp-cps.c +++ b/arch/mips/kernel/smp-cps.c @@ -27,14 +27,25 @@ #include #include +static bool threads_disabled; static DECLARE_BITMAP(core_power, NR_CPUS); struct core_boot_config *mips_cps_core_bootcfg; +static int __init setup_nothreads(char *s) +{ + threads_disabled = true; + return 0; +} +early_param("nothreads", setup_nothreads); + static unsigned core_vpe_count(unsigned core) { unsigned cfg; + if (threads_disabled) + return 1; + if ((!config_enabled(CONFIG_MIPS_MT_SMP) || !cpu_has_mipsmt) && (!config_enabled(CONFIG_CPU_MIPSR6) || !cpu_has_vp)) return 1; -- 2.7.4