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authorDave Hansen <haveblue@us.ibm.com>2005-10-30 02:16:52 +0100
committerLinus Torvalds <torvalds@g5.osdl.org>2005-10-30 05:40:44 +0100
commit208d54e5513c0c02d85af0990901354c74364d5c (patch)
tree83922f1d4a83f19bffcbff299044f421bd7e9c73 /arch/ppc64
parent[PATCH] memory hotplug prep: fixup bad_range() (diff)
downloadlinux-208d54e5513c0c02d85af0990901354c74364d5c.tar.xz
linux-208d54e5513c0c02d85af0990901354c74364d5c.zip
[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 'arch/ppc64')
-rw-r--r--arch/ppc64/mm/init.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/ppc64/mm/init.c b/arch/ppc64/mm/init.c
index a45584b3440c..975b26de34d6 100644
--- a/arch/ppc64/mm/init.c
+++ b/arch/ppc64/mm/init.c
@@ -104,6 +104,8 @@ void show_mem(void)
show_free_areas();
printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
for_each_pgdat(pgdat) {
+ unsigned long flags;
+ pgdat_resize_lock(pgdat, &flags);
for (i = 0; i < pgdat->node_spanned_pages; i++) {
page = pgdat_page_nr(pgdat, i);
total++;
@@ -114,6 +116,7 @@ void show_mem(void)
else if (page_count(page))
shared += page_count(page) - 1;
}
+ pgdat_resize_unlock(pgdat, &flags);
}
printk("%ld pages of RAM\n", total);
printk("%ld reserved pages\n", reserved);
@@ -647,11 +650,14 @@ void __init mem_init(void)
#endif
for_each_pgdat(pgdat) {
+ unsigned long flags;
+ pgdat_resize_lock(pgdat, &flags);
for (i = 0; i < pgdat->node_spanned_pages; i++) {
page = pgdat_page_nr(pgdat, i);
if (PageReserved(page))
reservedpages++;
}
+ pgdat_resize_unlock(pgdat, &flags);
}
codesize = (unsigned long)&_etext - (unsigned long)&_stext;