On Tue, 26 Jun 2012, Wen Congyang wrote:
> diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c
> index a325bb9..2e5d5ab 100644
> --- a/drivers/acpi/acpi_memhotplug.c
> +++ b/drivers/acpi/acpi_memhotplug.c
> @@ -78,6 +78,7 @@ struct acpi_memory_info {
> unsigned short caching; /* memory cache attribute */
> unsigned short write_protect; /* memory read/write attribute */
> unsigned int enabled:1;
> + unsigned int failed:1;
> };
>
> struct acpi_memory_device {
> @@ -251,9 +252,19 @@ static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
> node = memory_add_physaddr_to_nid(info->start_addr);
>
> result = add_memory(node, info->start_addr, info->length);
> - if (result)
> +
> + /*
> + * If the memory block has been used by the kernel, add_memory()
> + * returns -EEXIST. If add_memory() returns the other error, it
> + * means that this memory block is not used by the kernel.
> + */
> + if (result && result != -EEXIST) {
> + info->failed = 1;
> continue;
> - info->enabled = 1;
> + }
> +
> + if (!result)
> + info->enabled = 1;
> num_enabled++;
> }
> if (!num_enabled) {
num_enabled should only be incremented for result == 0.
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