On 5/1/24 00:24, Jonathan Cameron wrote:
From: James Morse <james.morse@xxxxxxx> The 'offline' file in sysfs shows all offline CPUs, including those that aren't present. User-space is expected to remove not-present CPUs from this list to learn which CPUs could be brought online. CPUs can be present but not-enabled. These CPUs can't be brought online until the firmware policy changes, which comes with an ACPI notification that will register the CPUs. With only the offline and present files, user-space is unable to determine which CPUs it can try to bring online. Add a new CPU mask that shows this based on all the registered CPUs. Signed-off-by: James Morse <james.morse@xxxxxxx> Tested-by: Miguel Luis <miguel.luis@xxxxxxxxxx> Tested-by: Vishnu Pajjuri <vishnu@xxxxxxxxxxxxxxxxxxxxxx> Tested-by: Jianyong Wu <jianyong.wu@xxxxxxx> Acked-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Signed-off-by: Russell King (Oracle) <rmk+kernel@xxxxxxxxxxxxxxx> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx> --- v9: No change --- .../ABI/testing/sysfs-devices-system-cpu | 6 +++++ drivers/base/cpu.c | 10 ++++++++ include/linux/cpumask.h | 25 +++++++++++++++++++ kernel/cpu.c | 3 +++ 4 files changed, 44 insertions(+)
Reviewed-by: Gavin Shan <gshan@xxxxxxxxxx>
