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UPSTREAM: MIPS: smp-cps: Add nothreads kernel parameter

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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>
(cherry picked from commit 6422a913856716be080dba4c2cb9d083d4e244ed)
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Paul Burton 2016-02-03 03:15:34 +00:00 • committed by Greg Kroah-Hartman
parent f7eed353c5
commit 7e307c7f65
1 changed files with 11 additions and 0 deletions
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11
arch/mips/kernel/smp-cps.c
View file

@ -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;