On Mon, 2013-03-18 at 11:19 +0900, Yasuaki Ishimatsu wrote:Hi Toshi,
Sorry for the late reply
2013/03/13 23:50, Toshi Kani wrote: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
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@xxxxxxxxxxxxxx>
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
@@ -254,8 +254,8 @@ static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
- 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.
For controlling memory hotplug, we need either failed bit or enabled bit.
So I want to remove failed bit as follows:
acpi_memory_info has enabled bit and failed bit for controlling memory
hotplug. But we don't need to keep both bits.
The patch removes acpi_memory_info->failed bit.
Thanks for the update. Which branch does this patch apply to? I tried
several, but could not apply.