When (hot)adding memory into system, /sys/firmware/memmap/X/{end, start, type} sysfs files are created. But there is no code to remove these files. The patch implements the function to remove them. Note : The code does not free firmware_map_entry since there is no way to free memory which is allocated by bootmem. CC: Len Brown <len.brown@xxxxxxxxx> CC: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx> CC: Paul Mackerras <paulus@xxxxxxxxx> CC: Christoph Lameter <cl@xxxxxxxxx> Cc: Minchan Kim <minchan.kim@xxxxxxxxx> CC: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> CC: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx> CC: Wen Congyang <wency@xxxxxxxxxxxxxx> Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@xxxxxxxxxxxxxx> --- drivers/firmware/memmap.c | 71 +++++++++++++++++++++++++++++++++++++++++++ include/linux/firmware-map.h | 6 +++ mm/memory_hotplug.c | 6 +++ 3 files changed, 82 insertions(+), 1 deletion(-) Index: linux-3.5-rc4/mm/memory_hotplug.c =================================================================== --- linux-3.5-rc4.orig/mm/memory_hotplug.c 2012-06-26 13:37:30.546288901 +0900 +++ linux-3.5-rc4/mm/memory_hotplug.c 2012-06-26 13:44:37.069955820 +0900 @@ -661,7 +661,11 @@ EXPORT_SYMBOL_GPL(add_memory); int remove_memory(int nid, u64 start, u64 size) { - return -EBUSY; + lock_memory_hotplug(); + /* remove memmap entry */ + firmware_map_remove(start, start + size, "System RAM"); + unlock_memory_hotplug(); + return 0; } EXPORT_SYMBOL_GPL(remove_memory); Index: linux-3.5-rc4/include/linux/firmware-map.h =================================================================== --- linux-3.5-rc4.orig/include/linux/firmware-map.h 2012-06-25 04:53:04.000000000 +0900 +++ linux-3.5-rc4/include/linux/firmware-map.h 2012-06-26 13:44:37.070955807 +0900 @@ -25,6 +25,7 @@ int firmware_map_add_early(u64 start, u64 end, const char *type); int firmware_map_add_hotplug(u64 start, u64 end, const char *type); +int firmware_map_remove(u64 start, u64 end, const char *type); #else /* CONFIG_FIRMWARE_MEMMAP */ @@ -38,6 +39,11 @@ static inline int firmware_map_add_hotpl return 0; } +static inline int firmware_map_remove(u64 start, u64 end, const char *type) +{ + return 0; +} + #endif /* CONFIG_FIRMWARE_MEMMAP */ #endif /* _LINUX_FIRMWARE_MAP_H */ Index: linux-3.5-rc4/drivers/firmware/memmap.c =================================================================== --- linux-3.5-rc4.orig/drivers/firmware/memmap.c 2012-06-25 04:53:04.000000000 +0900 +++ linux-3.5-rc4/drivers/firmware/memmap.c 2012-06-26 13:47:17.606948898 +0900 @@ -123,6 +123,16 @@ static int firmware_map_add_entry(u64 st return 0; } +/** + * firmware_map_remove_entry() - Does the real work to remove a firmware + * memmap entry. + * @entry: removed entry. + **/ +static inline void firmware_map_remove_entry(struct firmware_map_entry *entry) +{ + list_del(&entry->list); +} + /* * Add memmap entry on sysfs */ @@ -144,6 +154,31 @@ static int add_sysfs_fw_map_entry(struct return 0; } +/* + * Remove memmap entry on sysfs + */ +static inline void remove_sysfs_fw_map_entry(struct firmware_map_entry *entry) +{ + kobject_del(&entry->kobj); +} + +/* + * Search memmap entry + */ + +struct firmware_map_entry * __meminit +find_firmware_map_entry(u64 start, u64 end, const char *type) +{ + struct firmware_map_entry *entry; + + list_for_each_entry(entry, &map_entries, list) + if ((entry->start == start) && (entry->end == end) && + (!strcmp(entry->type, type))) + return entry; + + return NULL; +} + /** * firmware_map_add_hotplug() - Adds a firmware mapping entry when we do * memory hotplug. @@ -196,6 +231,42 @@ int __init firmware_map_add_early(u64 st return firmware_map_add_entry(start, end, type, entry); } +void release_firmware_map_entry(struct firmware_map_entry *entry) +{ + /* + * FIXME : There is no idea. + * How to free the entry which allocated bootmem? + */ +} + +/** + * firmware_map_remove() - remove a firmware mapping entry + * @start: Start of the memory range. + * @end: End of the memory range (inclusive). + * @type: Type of the memory range. + * + * removes a firmware mapping entry. + * + * Returns 0 on success, or -EINVAL if no entry. + **/ +int __meminit firmware_map_remove(u64 start, u64 end, const char *type) +{ + struct firmware_map_entry *entry; + + entry = find_firmware_map_entry(start, end, type); + if (!entry) + return -EINVAL; + + /* remove the memmap entry */ + remove_sysfs_fw_map_entry(entry); + + firmware_map_remove_entry(entry); + + release_firmware_map_entry(entry); + + return 0; +} + /* * Sysfs functions ------------------------------------------------------------- */ -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html