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| author |   Paul Burton <paul.burton@imgtec.com> | 2016-02-03 03:15:34 +0000 |
|---|---|---|
| committer |   Ralf Baechle <ralf@linux-mips.org> | 2016-05-13 14:01:50 +0200 |
| commit | 6422a913856716be080dba4c2cb9d083d4e244ed (patch) | |
| tree | fb64805a62601dc1821c251393a9c82358bbabbf /arch/mips/kernel/smp-cps.c | |
| parent | MIPS: smp-cps: Support MIPSr6 Virtual Processors (diff) | |
| download | linux-dev-6422a913856716be080dba4c2cb9d083d4e244ed.tar.xz linux-dev-6422a913856716be080dba4c2cb9d083d4e244ed.zip | |
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 <paul.burton@imgtec.com>
Cc: Matt Redfearn <matt.redfearn@imgtec.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Niklas Cassel <niklas.cassel@axis.com>
Cc: Ezequiel Garcia <ezequiel.garcia@imgtec.com>
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 <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/kernel/smp-cps.c')
| -rw-r--r-- | arch/mips/kernel/smp-cps.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/mips/kernel/smp-cps.c b/arch/mips/kernel/smp-cps.c index 06512171fd19..1061bd2e7e9c 100644 --- a/arch/mips/kernel/smp-cps.c +++ b/arch/mips/kernel/smp-cps.c @@ -27,14 +27,25 @@ #include <asm/time.h> #include <asm/uasm.h> +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; |