On Fri, Nov 24, 2017 at 11:22 AM, Andrea Reale <ar@xxxxxxxxxxxxxxxxxx> wrote:
> Resending the patch adding linux-acpi in CC, as suggested by Rafael.
> Everyone else: apologies for the noise.
>
> Commit 242831eb15a0 ("Memory hotplug / ACPI: Simplify memory removal")
> introduced an assumption whereas when control
> reaches remove_memory the corresponding memory has been already
> offlined. In that case, the acpi_memhotplug was making sure that
> the assumption held.
> This assumption, however, is not necessarily true if offlining
> and removal are not done by the same "controller" (for example,
> when first offlining via sysfs).
>
> Removing this assumption for the generic remove_memory code
> and moving it in the specific acpi_memhotplug code. This is
> a dependency for the software-aided arm64 offlining and removal
> process.
>
> Signed-off-by: Andrea Reale <ar@xxxxxxxxxxxxxxxxxx>
> Signed-off-by: Maciej Bielski <m.bielski@xxxxxxxxxxxxxxxxxx>
> ---
> drivers/acpi/acpi_memhotplug.c | 2 +-
> include/linux/memory_hotplug.h | 9 ++++++---
> mm/memory_hotplug.c | 13 +++++++++----
> 3 files changed, 16 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c
> index 6b0d3ef..b0126a0 100644
> --- a/drivers/acpi/acpi_memhotplug.c
> +++ b/drivers/acpi/acpi_memhotplug.c
> @@ -282,7 +282,7 @@ static void acpi_memory_remove_memory(struct acpi_memory_device *mem_device)
> nid = memory_add_physaddr_to_nid(info->start_addr);
>
> acpi_unbind_memory_blocks(info);
> - remove_memory(nid, info->start_addr, info->length);
> + BUG_ON(remove_memory(nid, info->start_addr, info->length));
Why does this have to be BUG_ON()? Is it really necessary to kill the
system here?
If it is, please add a comment describing why continuing is not an option here.
> list_del(&info->list);
> kfree(info);
> }
Thanks,
Rafael
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