redonkable/alistair23-linux
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Merge branch 'slab/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/slab-2.6

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* 'slab/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/slab-2.6:
  Update Pekka's email address in MAINTAINERS
  mm/slab.c: make local symbols static
  slub: Avoid use of slub_lock in show_slab_objects()
  memory hotplug: one more lock on memory hotplug
This commit is contained in:
Linus Torvalds 2011-01-15 13:01:14 -08:00
parent f9ee7f60d6 2ed1c5257b
commit 1b59be2a6c
5 changed files with 17 additions and 7 deletions
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4
MAINTAINERS
View file

@ -3684,7 +3684,7 @@ F: kernel/debug/
KMEMCHECK
M: Vegard Nossum <vegardno@ifi.uio.no>
M: Pekka Enberg <penberg@cs.helsinki.fi>
M: Pekka Enberg <penberg@kernel.org>
S: Maintained
F: Documentation/kmemcheck.txt
F: arch/x86/include/asm/kmemcheck.h
@ -5646,7 +5646,7 @@ F: drivers/net/sky2.*
SLAB ALLOCATOR
M: Christoph Lameter <cl@linux-foundation.org>
M: Pekka Enberg <penberg@cs.helsinki.fi>
M: Pekka Enberg <penberg@kernel.org>
M: Matt Mackall <mpm@selenic.com>
L: linux-mm@kvack.org
S: Maintained

6
include/linux/memory_hotplug.h
View file

@ -165,6 +165,12 @@ extern void register_page_bootmem_info_node(struct pglist_data *pgdat);
extern void put_page_bootmem(struct page *page);
#endif
/*
* Lock for memory hotplug guarantees 1) all callbacks for memory hotplug
* notifier will be called under this. 2) offline/online/add/remove memory
* will not run simultaneously.
*/
void lock_memory_hotplug(void);
void unlock_memory_hotplug(void);

4
mm/memory_hotplug.c
View file

@ -409,6 +409,7 @@ int online_pages(unsigned long pfn, unsigned long nr_pages)
int ret;
struct memory_notify arg;
lock_memory_hotplug();
arg.start_pfn = pfn;
arg.nr_pages = nr_pages;
arg.status_change_nid = -1;
@ -421,6 +422,7 @@ int online_pages(unsigned long pfn, unsigned long nr_pages)
ret = notifier_to_errno(ret);
if (ret) {
memory_notify(MEM_CANCEL_ONLINE, &arg);
unlock_memory_hotplug();
return ret;
}
/*
@ -445,6 +447,7 @@ int online_pages(unsigned long pfn, unsigned long nr_pages)
printk(KERN_DEBUG "online_pages %lx at %lx failed\n",
nr_pages, pfn);
memory_notify(MEM_CANCEL_ONLINE, &arg);
unlock_memory_hotplug();
return ret;
}
@ -469,6 +472,7 @@ int online_pages(unsigned long pfn, unsigned long nr_pages)
if (onlined_pages)
memory_notify(MEM_ONLINE, &arg);
unlock_memory_hotplug();
return 0;
}

6
mm/slab.c
View file

@ -284,7 +284,7 @@ struct kmem_list3 {
* Need this for bootstrapping a per node allocator.
*/
#define NUM_INIT_LISTS (3 * MAX_NUMNODES)
struct kmem_list3 __initdata initkmem_list3[NUM_INIT_LISTS];
static struct kmem_list3 __initdata initkmem_list3[NUM_INIT_LISTS];
#define CACHE_CACHE 0
#define SIZE_AC MAX_NUMNODES
#define SIZE_L3 (2 * MAX_NUMNODES)
@ -4053,7 +4053,7 @@ static int enable_cpucache(struct kmem_cache *cachep, gfp_t gfp)
* necessary. Note that the l3 listlock also protects the array_cache
* if drain_array() is used on the shared array.
*/
void drain_array(struct kmem_cache *cachep, struct kmem_list3 *l3,
static void drain_array(struct kmem_cache *cachep, struct kmem_list3 *l3,
struct array_cache *ac, int force, int node)
{
int tofree;
@ -4317,7 +4317,7 @@ static const struct seq_operations slabinfo_op = {
* @count: data length
* @ppos: unused
*/
ssize_t slabinfo_write(struct file *file, const char __user * buffer,
static ssize_t slabinfo_write(struct file *file, const char __user *buffer,
size_t count, loff_t *ppos)
{
char kbuf[MAX_SLABINFO_WRITE + 1], *tmp;

4
mm/slub.c
View file

@ -3797,7 +3797,7 @@ static ssize_t show_slab_objects(struct kmem_cache *s,
}
}
down_read(&slub_lock);
lock_memory_hotplug();
#ifdef CONFIG_SLUB_DEBUG
if (flags & SO_ALL) {
for_each_node_state(node, N_NORMAL_MEMORY) {
@ -3838,7 +3838,7 @@ static ssize_t show_slab_objects(struct kmem_cache *s,
x += sprintf(buf + x, " N%d=%lu",
node, nodes[node]);
#endif
up_read(&slub_lock);
unlock_memory_hotplug();
kfree(nodes);
return x + sprintf(buf + x, "\n");
}