diff options
| author | James Morse <james.morse@arm.com> | 2021-07-02 16:48:41 +0100 |
|---|---|---|
| committer | Russell King (Oracle) <rmk+kernel@armlinux.org.uk> | 2023-08-29 15:30:08 +0100 |
| commit | 8a34ac66449388a2e3cd1825bd9ea59c5e72b17a (patch) | |
| tree | b870fe1499b28df0d3501873cfc2ce67b685e737 /include/linux/cpu.h | |
| parent | 13bd3033d6e6f502da61bedd480891988f43813d (diff) | |
ACPI: Check _STA present bit before making CPUs not present
When called acpi_processor_post_eject() unconditionally make a CPU
not-present and unregisters it.
To add support for AML events where the CPU has become disabled, but
remains present, the _STA method should be checked before calling
acpi_processor_remove().
Rename acpi_processor_post_eject() acpi_processor_remove_possible(), and
check the _STA before calling.
Adding the function prototype for arch_unregister_cpu() allows the
preprocessor guards to be removed.
After this change CPUs will remain registered and visible to
user-space as offline if buggy firmware triggers an eject-request,
but doesn't clear the corresponding _STA bits after _EJ0 has been
called.
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Diffstat (limited to 'include/linux/cpu.h')
| -rw-r--r-- | include/linux/cpu.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/cpu.h b/include/linux/cpu.h index 7efa3adc65a2..cb09e7ca1d95 100644 --- a/include/linux/cpu.h +++ b/include/linux/cpu.h @@ -80,6 +80,7 @@ struct device *cpu_device_create(struct device *parent, void *drvdata, const struct attribute_group **groups, const char *fmt, ...); extern int arch_register_cpu(int cpu); +extern void arch_unregister_cpu(int cpu); #ifdef CONFIG_HOTPLUG_CPU extern void unregister_cpu(struct cpu *cpu); extern ssize_t arch_cpu_probe(const char *, size_t); |