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authorKevin Cernekee <cernekee@gmail.com>2010-05-02 14:43:52 -0700
committerRalf Baechle <ralf@linux-mips.org>2010-05-21 21:31:17 +0100
commit0103d23f44b1e9f8d2e89cc197e21192f6914f24 (patch)
treea5be6db45c86235702e10edd64a62bdd7072e40d /arch
parent4f1e099582c119cf73d6a873b53e8edaa773d065 (diff)
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MIPS: nofpu and nodsp only affect CPU0
The "nofpu" and "nodsp" kernel command line options currently do not affect CPUs that are brought online later in the boot process or hotplugged at runtime. It is desirable to apply the nofpu/nodsp options to all CPUs in the system, so that surprising results are not seen when a process migrates from one CPU to another. [Ralf: Moved definitions of mips_fpu_disabled, fpu_disable, mips_dsp_disabled and dsp_disable from setup.c to cpu-probe.c to allow making mips_fpu_disabled and mips_dsp_disabled static.] Signed-off-by: Kevin Cernekee <cernekee@gmail.com> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: http://patchwork.linux-mips.org/patch/1169/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/mips/kernel/cpu-probe.c30
-rw-r--r--arch/mips/kernel/setup.c21
2 files changed, 30 insertions, 21 deletions
diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index be5bb16be4e..3562b854f2c 100644
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -125,6 +125,30 @@ static int __init wait_disable(char *s)
__setup("nowait", wait_disable);
+static int __cpuinitdata mips_fpu_disabled;
+
+static int __init fpu_disable(char *s)
+{
+ cpu_data[0].options &= ~MIPS_CPU_FPU;
+ mips_fpu_disabled = 1;
+
+ return 1;
+}
+
+__setup("nofpu", fpu_disable);
+
+int __cpuinitdata mips_dsp_disabled;
+
+static int __init dsp_disable(char *s)
+{
+ cpu_data[0].ases &= ~MIPS_ASE_DSP;
+ mips_dsp_disabled = 1;
+
+ return 1;
+}
+
+__setup("nodsp", dsp_disable);
+
void __init check_wait(void)
{
struct cpuinfo_mips *c = &current_cpu_data;
@@ -982,6 +1006,12 @@ __cpuinit void cpu_probe(void)
*/
BUG_ON(current_cpu_type() != c->cputype);
+ if (mips_fpu_disabled)
+ c->options &= ~MIPS_CPU_FPU;
+
+ if (mips_dsp_disabled)
+ c->ases &= ~MIPS_ASE_DSP;
+
if (c->options & MIPS_CPU_FPU) {
c->fpu_id = cpu_get_fpu_id();
diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index f9513f9e61d..85aef3fc671 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -569,27 +569,6 @@ void __init setup_arch(char **cmdline_p)
plat_smp_setup();
}
-static int __init fpu_disable(char *s)
-{
- int i;
-
- for (i = 0; i < NR_CPUS; i++)
- cpu_data[i].options &= ~MIPS_CPU_FPU;
-
- return 1;
-}
-
-__setup("nofpu", fpu_disable);
-
-static int __init dsp_disable(char *s)
-{
- cpu_data[0].ases &= ~MIPS_ASE_DSP;
-
- return 1;
-}
-
-__setup("nodsp", dsp_disable);
-
unsigned long kernelsp[NR_CPUS];
unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;