diff options
Diffstat (limited to 'drivers/base/memory.c')
| -rw-r--r-- | drivers/base/memory.c | 34 |
1 files changed, 33 insertions, 1 deletions
diff --git a/drivers/base/memory.c b/drivers/base/memory.c index 48c0a1d0dd3a..861c36f8ec22 100644 --- a/drivers/base/memory.c +++ b/drivers/base/memory.c @@ -476,7 +476,36 @@ out: } static DEVICE_ATTR(probe, S_IWUSR, NULL, memory_probe_store); -#endif + +#ifdef CONFIG_MEMORY_HOTREMOVE +static ssize_t +memory_remove_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + u64 phys_addr; + int nid, ret; + unsigned long pages_per_block = PAGES_PER_SECTION * sections_per_block; + + ret = kstrtoull(buf, 0, &phys_addr); + if (ret) + return ret; + + if (phys_addr & ((pages_per_block << PAGE_SHIFT) - 1)) + return -EINVAL; + + nid = memory_add_physaddr_to_nid(phys_addr); + ret = lock_device_hotplug_sysfs(); + if (ret) + return ret; + + remove_memory(nid, phys_addr, + MIN_MEMORY_BLOCK_SIZE * sections_per_block); + unlock_device_hotplug(); + return count; +} +static DEVICE_ATTR(remove, S_IWUSR, NULL, memory_remove_store); +#endif /* CONFIG_MEMORY_HOTREMOVE */ +#endif /* CONFIG_ARCH_MEMORY_PROBE */ #ifdef CONFIG_MEMORY_FAILURE /* @@ -728,6 +757,9 @@ bool is_memblock_offlined(struct memory_block *mem) static struct attribute *memory_root_attrs[] = { #ifdef CONFIG_ARCH_MEMORY_PROBE &dev_attr_probe.attr, +#ifdef CONFIG_MEMORY_HOTREMOVE + &dev_attr_remove.attr, +#endif #endif #ifdef CONFIG_MEMORY_FAILURE |