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memcg: page_cgroup array is never stored on reserved pages

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KAMEZAWA Hiroyuki noted that free_pages_cgroup doesn't have to check for
PageReserved because we never store the array on reserved pages (neither
alloc_pages_exact nor vmalloc use those pages).

So we can replace the check by a BUG_ON.

Signed-off-by: Michal Hocko <[email protected]>
Acked-by: KAMEZAWA Hiroyuki <[email protected]>
Cc: Balbir Singh <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Michal Hocko 2011-03-23 16:42:41 -07:00 • committed by Linus Torvalds
commit 6cfddb2615
1 changed files with 5 additions and 5 deletions
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10
mm/page_cgroup.c
View file

@ -153,11 +153,11 @@ static void free_page_cgroup(void *addr)
vfree(addr);
} else {
struct page *page = virt_to_page(addr);
if (!PageReserved(page)) { /* Is bootmem ? */
size_t table_size =
sizeof(struct page_cgroup) * PAGES_PER_SECTION;
free_pages_exact(addr, table_size);
}
size_t table_size =
sizeof(struct page_cgroup) * PAGES_PER_SECTION;
BUG_ON(PageReserved(page));
free_pages_exact(addr, table_size);
}
}
#endif