diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2010-10-22 19:36:42 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-10-22 19:36:42 -0700 |
commit | b9da0571050c09863e59f94d0b8594a290d61b88 (patch) | |
tree | 3632c4fee768db9a27a5c872bd42133692e2f3d0 /drivers/base/memory.c | |
parent | f8cae0f03f75adb54b1d48ddbc90f84a1f5de186 (diff) | |
parent | 5abd935661e01289ba143c3b2c1ba300c65bcc5f (diff) |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6
* git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6: (31 commits)
driver core: Display error codes when class suspend fails
Driver core: Add section count to memory_block struct
Driver core: Add mutex for adding/removing memory blocks
Driver core: Move find_memory_block routine
hpilo: Despecificate driver from iLO generation
driver core: Convert link_mem_sections to use find_memory_block_hinted.
driver core: Introduce find_memory_block_hinted which utilizes kset_find_obj_hinted.
kobject: Introduce kset_find_obj_hinted.
driver core: fix build for CONFIG_BLOCK not enabled
driver-core: base: change to new flag variable
sysfs: only access bin file vm_ops with the active lock
sysfs: Fail bin file mmap if vma close is implemented.
FW_LOADER: fix kconfig dependency warning on HOTPLUG
uio: Statically allocate uio_class and use class .dev_attrs.
uio: Support 2^MINOR_BITS minors
uio: Cleanup irq handling.
uio: Don't clear driver data
uio: Fix lack of locking in init_uio_class
SYSFS: Allow boot time switching between deprecated and modern sysfs layout
driver core: remove CONFIG_SYSFS_DEPRECATED_V2 but keep it for block devices
...
Diffstat (limited to 'drivers/base/memory.c')
-rw-r--r-- | drivers/base/memory.c | 94 |
1 files changed, 57 insertions, 37 deletions
diff --git a/drivers/base/memory.c b/drivers/base/memory.c index 933442f40321..cafeaaf0428f 100644 --- a/drivers/base/memory.c +++ b/drivers/base/memory.c @@ -27,6 +27,8 @@ #include <asm/atomic.h> #include <asm/uaccess.h> +static DEFINE_MUTEX(mem_sysfs_mutex); + #define MEMORY_CLASS_NAME "memory" static struct sysdev_class memory_sysdev_class = { @@ -435,6 +437,45 @@ int __weak arch_get_memory_phys_device(unsigned long start_pfn) return 0; } +struct memory_block *find_memory_block_hinted(struct mem_section *section, + struct memory_block *hint) +{ + struct kobject *kobj; + struct sys_device *sysdev; + struct memory_block *mem; + char name[sizeof(MEMORY_CLASS_NAME) + 9 + 1]; + + kobj = hint ? &hint->sysdev.kobj : NULL; + + /* + * This only works because we know that section == sysdev->id + * slightly redundant with sysdev_register() + */ + sprintf(&name[0], "%s%d", MEMORY_CLASS_NAME, __section_nr(section)); + + kobj = kset_find_obj_hinted(&memory_sysdev_class.kset, name, kobj); + if (!kobj) + return NULL; + + sysdev = container_of(kobj, struct sys_device, kobj); + mem = container_of(sysdev, struct memory_block, sysdev); + + return mem; +} + +/* + * For now, we have a linear search to go find the appropriate + * memory_block corresponding to a particular phys_index. If + * this gets to be a real problem, we can always use a radix + * tree or something here. + * + * This could be made generic for all sysdev classes. + */ +struct memory_block *find_memory_block(struct mem_section *section) +{ + return find_memory_block_hinted(section, NULL); +} + static int add_memory_block(int nid, struct mem_section *section, unsigned long state, enum mem_add_context context) { @@ -445,8 +486,11 @@ static int add_memory_block(int nid, struct mem_section *section, if (!mem) return -ENOMEM; + mutex_lock(&mem_sysfs_mutex); + mem->phys_index = __section_nr(section); mem->state = state; + mem->section_count++; mutex_init(&mem->state_mutex); start_pfn = section_nr_to_pfn(mem->phys_index); mem->phys_device = arch_get_memory_phys_device(start_pfn); @@ -465,53 +509,29 @@ static int add_memory_block(int nid, struct mem_section *section, ret = register_mem_sect_under_node(mem, nid); } + mutex_unlock(&mem_sysfs_mutex); return ret; } -/* - * For now, we have a linear search to go find the appropriate - * memory_block corresponding to a particular phys_index. If - * this gets to be a real problem, we can always use a radix - * tree or something here. - * - * This could be made generic for all sysdev classes. - */ -struct memory_block *find_memory_block(struct mem_section *section) -{ - struct kobject *kobj; - struct sys_device *sysdev; - struct memory_block *mem; - char name[sizeof(MEMORY_CLASS_NAME) + 9 + 1]; - - /* - * This only works because we know that section == sysdev->id - * slightly redundant with sysdev_register() - */ - sprintf(&name[0], "%s%d", MEMORY_CLASS_NAME, __section_nr(section)); - - kobj = kset_find_obj(&memory_sysdev_class.kset, name); - if (!kobj) - return NULL; - - sysdev = container_of(kobj, struct sys_device, kobj); - mem = container_of(sysdev, struct memory_block, sysdev); - - return mem; -} - int remove_memory_block(unsigned long node_id, struct mem_section *section, int phys_device) { struct memory_block *mem; + mutex_lock(&mem_sysfs_mutex); mem = find_memory_block(section); - unregister_mem_sect_under_nodes(mem); - mem_remove_simple_file(mem, phys_index); - mem_remove_simple_file(mem, state); - mem_remove_simple_file(mem, phys_device); - mem_remove_simple_file(mem, removable); - unregister_memory(mem, section); + mem->section_count--; + if (mem->section_count == 0) { + unregister_mem_sect_under_nodes(mem); + mem_remove_simple_file(mem, phys_index); + mem_remove_simple_file(mem, state); + mem_remove_simple_file(mem, phys_device); + mem_remove_simple_file(mem, removable); + unregister_memory(mem, section); + } + + mutex_unlock(&mem_sysfs_mutex); return 0; } |