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authorThomas Gleixner <tglx@linutronix.de>2018-07-13 16:23:24 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-08-15 18:14:50 +0200
commit929d3b2e9b130f238a8eb206bdc3f063ca68438f (patch)
treedcd3df483a9cc57fafe82e27268ea09c130b44f0 /kernel
parenta69c5e0706dc6783e11830bccafe34c0b7f0a979 (diff)
cpu/hotplug: Set CPU_SMT_NOT_SUPPORTED early
commit fee0aede6f4739c87179eca76136f83210953b86 upstream The CPU_SMT_NOT_SUPPORTED state is set (if the processor does not support SMT) when the sysfs SMT control file is initialized. That was fine so far as this was only required to make the output of the control file correct and to prevent writes in that case. With the upcoming l1tf command line parameter, this needs to be set up before the L1TF mitigation selection and command line parsing happens. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Jiri Kosina <jkosina@suse.cz> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Josh Poimboeuf <jpoimboe@redhat.com> Link: https://lkml.kernel.org/r/20180713142323.121795971@linutronix.de Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/cpu.c13
1 files changed, 10 insertions, 3 deletions
diff --git a/kernel/cpu.c b/kernel/cpu.c
index e1de463a90f2..8a2ad1587280 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -374,6 +374,16 @@ void __init cpu_smt_disable(bool force)
}
}
+/*
+ * The decision whether SMT is supported can only be done after the full
+ * CPU identification. Called from architecture code.
+ */
+void __init cpu_smt_check_topology(void)
+{
+ if (!topology_smt_supported())
+ cpu_smt_control = CPU_SMT_NOT_SUPPORTED;
+}
+
static int __init smt_cmdline_disable(char *str)
{
cpu_smt_disable(str && !strcmp(str, "force"));
@@ -2053,9 +2063,6 @@ static const struct attribute_group cpuhp_smt_attr_group = {
static int __init cpu_smt_state_init(void)
{
- if (!topology_smt_supported())
- cpu_smt_control = CPU_SMT_NOT_SUPPORTED;
-
return sysfs_create_group(&cpu_subsys.dev_root->kobj,
&cpuhp_smt_attr_group);
}