Commit 6422a913 authored Feb 03, 2016 by Paul Burton Committed by Ralf Baechle May 13, 2016

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>

parent 5a3e7c02

arch/mips/kernel/smp-cps.c

+11 −0

Original line number	Diff line number	Diff line
		@@ -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;

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