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authorDave Hansen <haveblue@us.ibm.com>2005-10-29 21:16:52 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2005-10-30 00:40:44 -0400
commit208d54e5513c0c02d85af0990901354c74364d5c (patch)
tree83922f1d4a83f19bffcbff299044f421bd7e9c73 /mm/page_alloc.c
parentc6a57e19e464db118dc4ab9cfe9e9748c6d630a0 (diff)
[PATCH] memory hotplug locking: node_size_lock
pgdat->node_size_lock is basically only neeeded in one place in the normal code: show_mem(), which is the arch-specific sysrq-m printing function. Strictly speaking, the architectures not doing memory hotplug do no need this locking in show_mem(). However, they are all included for completeness. This should also make any future consolidation of all of the implementations a little more straightforward. This lock is also held in the sparsemem code during a memory removal, as sections are invalidated. This is the place there pfn_valid() is made false for a memory area that's being removed. The lock is only required when doing pfn_valid() operations on memory which the user does not already have a reference on the page, such as in show_mem(). Signed-off-by: Dave Hansen <haveblue@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm/page_alloc.c')
-rw-r--r--mm/page_alloc.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index a51ef94eec33..32fad6d23200 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1958,6 +1958,7 @@ static void __init free_area_init_core(struct pglist_data *pgdat,
1958 int nid = pgdat->node_id; 1958 int nid = pgdat->node_id;
1959 unsigned long zone_start_pfn = pgdat->node_start_pfn; 1959 unsigned long zone_start_pfn = pgdat->node_start_pfn;
1960 1960
1961 pgdat_resize_init(pgdat);
1961 pgdat->nr_zones = 0; 1962 pgdat->nr_zones = 0;
1962 init_waitqueue_head(&pgdat->kswapd_wait); 1963 init_waitqueue_head(&pgdat->kswapd_wait);
1963 pgdat->kswapd_max_order = 0; 1964 pgdat->kswapd_max_order = 0;