| Message ID | 514022BF.3080303@jp.fujitsu.com (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Headers | show |
On Wed, 2013-03-13 at 15:54 +0900, Yasuaki Ishimatsu wrote: > At http://marc.info/?l=linux-acpi&m=135769405622667&w=2 thread, > Toshi Kani mentioned as follows: > > "I have a question about the change you made in commit 65479472 in > acpi_memhotplug.c. This change seems to require that > acpi_memory_enable_device() calls add_memory() to add all memory ranges > represented by memory device objects at boot-time, and keep the results > be used for hot-remove. > > If I understand it right, this add_memory() call fails with EEXIST at > boot-time since all memory ranges should have been added from EFI memory > table (or e820) already. This results all memory ranges be marked as ! > enabled & !failed. I think this means that we cannot hot-delete any > memory ranges presented at boot-time since acpi_memory_remove_memory() > only calls remove_memory() when the enabled flag is set. Is that > correct?" > > Above mention is correct. Thus even if memory device supports hotplug, > memory presented at boot-time cannot be hot removed since the memory > device's acpi_memory_info->enabled is always 0. > > This patch changes to set 1 to "acpi_memory_info->enabled" of memory > device presented at boot-time for hot removing the memory device. > > Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> > > --- > drivers/acpi/acpi_memhotplug.c | 4 ++-- > 1 files changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c > index da1f82b..88fd46a 100644 > --- a/drivers/acpi/acpi_memhotplug.c > +++ b/drivers/acpi/acpi_memhotplug.c > @@ -254,8 +254,8 @@ static int acpi_memory_enable_device(struct acpi_memory_device *mem_device) > continue; > } > > - if (!result) > - info->enabled = 1; > + info->enabled = 1; Do we still need to keep the enable bit? I think !failed means enabled with this change. Thanks, -Toshi -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c index da1f82b..88fd46a 100644 --- a/drivers/acpi/acpi_memhotplug.c +++ b/drivers/acpi/acpi_memhotplug.c @@ -254,8 +254,8 @@ static int acpi_memory_enable_device(struct acpi_memory_device *mem_device) continue; } - if (!result) - info->enabled = 1; + info->enabled = 1; + /* * Add num_enable even if add_memory() returns -EEXIST, so the * device is bound to this driver.
At http://marc.info/?l=linux-acpi&m=135769405622667&w=2 thread, Toshi Kani mentioned as follows: "I have a question about the change you made in commit 65479472 in acpi_memhotplug.c. This change seems to require that acpi_memory_enable_device() calls add_memory() to add all memory ranges represented by memory device objects at boot-time, and keep the results be used for hot-remove. If I understand it right, this add_memory() call fails with EEXIST at boot-time since all memory ranges should have been added from EFI memory table (or e820) already. This results all memory ranges be marked as ! enabled & !failed. I think this means that we cannot hot-delete any memory ranges presented at boot-time since acpi_memory_remove_memory() only calls remove_memory() when the enabled flag is set. Is that correct?" Above mention is correct. Thus even if memory device supports hotplug, memory presented at boot-time cannot be hot removed since the memory device's acpi_memory_info->enabled is always 0. This patch changes to set 1 to "acpi_memory_info->enabled" of memory device presented at boot-time for hot removing the memory device. Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> --- drivers/acpi/acpi_memhotplug.c | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html