| Message ID | 20230913163823.7880-24-james.morse@arm.com (mailing list archive) |
|---|---|
| State | RFC, archived |
| Headers | show |
| Series | ACPI/arm64: add support for virtual cpuhotplug | expand |
On Wed, 13 Sep 2023 16:38:11 +0000 James Morse <james.morse@arm.com> wrote: > ACPI firmware can trigger the events to add and remove CPUs, but the > OS may not support this. > > Print a warning when this happens. > > This gives early warning on arm64 systems that don't support > CONFIG_ACPI_HOTPLUG_PRESENT_CPU, as making CPUs not present has > side effects for other parts of the system. > > Signed-off-by: James Morse <james.morse@arm.com> Seem like a good idea to me. Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> > --- > drivers/acpi/acpi_processor.c | 8 ++++++-- > 1 file changed, 6 insertions(+), 2 deletions(-) > > diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c > index 2cafea1edc24..b67616079751 100644 > --- a/drivers/acpi/acpi_processor.c > +++ b/drivers/acpi/acpi_processor.c > @@ -188,8 +188,10 @@ static int acpi_processor_make_present(struct acpi_processor *pr) > acpi_status status; > int ret; > > - if (!IS_ENABLED(CONFIG_ACPI_HOTPLUG_PRESENT_CPU)) > + if (!IS_ENABLED(CONFIG_ACPI_HOTPLUG_PRESENT_CPU)) { > + pr_err_once("Changing CPU present bit is not supported\n"); > return -ENODEV; > + } > > if (invalid_phys_cpuid(pr->phys_id)) > return -ENODEV; > @@ -462,8 +464,10 @@ static void acpi_processor_make_not_present(struct acpi_device *device) > { > struct acpi_processor *pr; > > - if (!IS_ENABLED(CONFIG_ACPI_HOTPLUG_PRESENT_CPU)) > + if (!IS_ENABLED(CONFIG_ACPI_HOTPLUG_PRESENT_CPU)) { > + pr_err_once("Changing CPU present bit is not supported"); > return; > + } > > pr = acpi_driver_data(device); > if (pr->id >= nr_cpu_ids)
On 9/14/23 02:38, James Morse wrote: > ACPI firmware can trigger the events to add and remove CPUs, but the > OS may not support this. > > Print a warning when this happens. ^^^^^^^ error message > > This gives early warning on arm64 systems that don't support > CONFIG_ACPI_HOTPLUG_PRESENT_CPU, as making CPUs not present has > side effects for other parts of the system. > > Signed-off-by: James Morse <james.morse@arm.com> > --- > drivers/acpi/acpi_processor.c | 8 ++++++-- > 1 file changed, 6 insertions(+), 2 deletions(-) > Maybe a warning message is enough, but a error message is also fine, I think. Reviewed-by: Gavin Shan <gshan@redhat.com> > diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c > index 2cafea1edc24..b67616079751 100644 > --- a/drivers/acpi/acpi_processor.c > +++ b/drivers/acpi/acpi_processor.c > @@ -188,8 +188,10 @@ static int acpi_processor_make_present(struct acpi_processor *pr) > acpi_status status; > int ret; > > - if (!IS_ENABLED(CONFIG_ACPI_HOTPLUG_PRESENT_CPU)) > + if (!IS_ENABLED(CONFIG_ACPI_HOTPLUG_PRESENT_CPU)) { > + pr_err_once("Changing CPU present bit is not supported\n"); > return -ENODEV; > + } > > if (invalid_phys_cpuid(pr->phys_id)) > return -ENODEV; > @@ -462,8 +464,10 @@ static void acpi_processor_make_not_present(struct acpi_device *device) > { > struct acpi_processor *pr; > > - if (!IS_ENABLED(CONFIG_ACPI_HOTPLUG_PRESENT_CPU)) > + if (!IS_ENABLED(CONFIG_ACPI_HOTPLUG_PRESENT_CPU)) { > + pr_err_once("Changing CPU present bit is not supported"); > return; > + } > > pr = acpi_driver_data(device); > if (pr->id >= nr_cpu_ids) Thanks, Gavin
diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c index 2cafea1edc24..b67616079751 100644 --- a/drivers/acpi/acpi_processor.c +++ b/drivers/acpi/acpi_processor.c @@ -188,8 +188,10 @@ static int acpi_processor_make_present(struct acpi_processor *pr) acpi_status status; int ret; - if (!IS_ENABLED(CONFIG_ACPI_HOTPLUG_PRESENT_CPU)) + if (!IS_ENABLED(CONFIG_ACPI_HOTPLUG_PRESENT_CPU)) { + pr_err_once("Changing CPU present bit is not supported\n"); return -ENODEV; + } if (invalid_phys_cpuid(pr->phys_id)) return -ENODEV; @@ -462,8 +464,10 @@ static void acpi_processor_make_not_present(struct acpi_device *device) { struct acpi_processor *pr; - if (!IS_ENABLED(CONFIG_ACPI_HOTPLUG_PRESENT_CPU)) + if (!IS_ENABLED(CONFIG_ACPI_HOTPLUG_PRESENT_CPU)) { + pr_err_once("Changing CPU present bit is not supported"); return; + } pr = acpi_driver_data(device); if (pr->id >= nr_cpu_ids)
ACPI firmware can trigger the events to add and remove CPUs, but the OS may not support this. Print a warning when this happens. This gives early warning on arm64 systems that don't support CONFIG_ACPI_HOTPLUG_PRESENT_CPU, as making CPUs not present has side effects for other parts of the system. Signed-off-by: James Morse <james.morse@arm.com> --- drivers/acpi/acpi_processor.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)