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authorPrakash, Prashanth <pprakash@codeaurora.org>2017-03-24 00:21:53 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-04-18 17:50:24 +0300
commit35b68735988447485074cfa862710e49c082c013 (patch)
tree744a792bd55dc12b6122ab28fb08ff8db52482d9 /drivers/acpi
parent4f7d029b9bf009fbee76bb10c0c4351a1870d2f3 (diff)
downloadlinux-35b68735988447485074cfa862710e49c082c013.tar.xz
ACPI / Processor: Drop setup_max_cpus check from acpi_processor_add()
When maxcpus=X kernel argument is used, we parse the ACPI tables only for the first X cpus. The per-cpu ACPI data include the _PSD tables which gives information about related cpus. cppc_cpufreq and acpi-cpufreq parses the table once during init to deduce the related cpus. If a user brings a new cpu online after boot the related cpu data becomes incorrect. acpi_get_psd_map() in acpi_cppc.c returns error if it fails to find the parsed ACPI data for possible CPU resulting in cppc_cpufreq initialization failure. With this change we will probe all possible CPUs prior to cpufreq initialization, but will bring only setup_max_cpus online. nr_cpus kernel parameter can be used to restict even parsing per-cpu ACPI tables. Signed-off-by: Prashanth Prakash <pprakash@codeaurora.org> [ rjw: Subject ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi')
-rw-r--r--drivers/acpi/acpi_processor.c5
1 files changed, 0 insertions, 5 deletions
diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c
index 0143135b3abe..f098e25b6b41 100644
--- a/drivers/acpi/acpi_processor.c
+++ b/drivers/acpi/acpi_processor.c
@@ -388,11 +388,6 @@ static int acpi_processor_add(struct acpi_device *device,
if (result) /* Processor is not physically present or unavailable */
return 0;
-#ifdef CONFIG_SMP
- if (pr->id >= setup_max_cpus && pr->id != 0)
- return 0;
-#endif
-
BUG_ON(pr->id >= nr_cpu_ids);
/*