| From | Greg Kroah-Hartman <> | Subject | [ 073/123] mm/hugetlb: create hugetlb cgroup file in hugetlb_init | Date | Wed, 9 Jan 2013 12:35:12 -0800 |
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3.7-stable review patch. If anyone has any objections, please let me know.
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From: Jianguo Wu <wujianguo@huawei.com>
commit 7179e7bf4592ac5a7b30257a7df6259ee81e51da upstream.
Build kernel with CONFIG_HUGETLBFS=y,CONFIG_HUGETLB_PAGE=y and CONFIG_CGROUP_HUGETLB=y, then specify hugepagesz=xx boot option, system will fail to boot.
This failure is caused by following code path:
setup_hugepagesz hugetlb_add_hstate hugetlb_cgroup_file_init cgroup_add_cftypes kzalloc <--slab is *not available* yet
For this path, slab is not available yet, so memory allocated will be failed, and cause WARN_ON() in hugetlb_cgroup_file_init().
So I move hugetlb_cgroup_file_init() into hugetlb_init().
[akpm@linux-foundation.org: tweak coding-style, remove pointless __init on inlined function] [akpm@linux-foundation.org: fix warning] Signed-off-by: Jianguo Wu <wujianguo@huawei.com> Signed-off-by: Jiang Liu <jiang.liu@huawei.com> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Acked-by: Michal Hocko <mhocko@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- include/linux/hugetlb_cgroup.h | 5 ++--- mm/hugetlb.c | 11 +---------- mm/hugetlb_cgroup.c | 19 +++++++++++++++++-- 3 files changed, 20 insertions(+), 15 deletions(-)
--- a/include/linux/hugetlb_cgroup.h +++ b/include/linux/hugetlb_cgroup.h @@ -62,7 +62,7 @@ extern void hugetlb_cgroup_uncharge_page struct page *page); extern void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages, struct hugetlb_cgroup *h_cg); -extern int hugetlb_cgroup_file_init(int idx) __init; +extern void hugetlb_cgroup_file_init(void) __init; extern void hugetlb_cgroup_migrate(struct page *oldhpage, struct page *newhpage); @@ -111,9 +111,8 @@ hugetlb_cgroup_uncharge_cgroup(int idx, return; } -static inline int __init hugetlb_cgroup_file_init(int idx) +static inline void hugetlb_cgroup_file_init(void) { - return 0; } static inline void hugetlb_cgroup_migrate(struct page *oldhpage, --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -1906,14 +1906,12 @@ static int __init hugetlb_init(void) default_hstate.max_huge_pages = default_hstate_max_huge_pages; hugetlb_init_hstates(); - gather_bootmem_prealloc(); - report_hugepages(); hugetlb_sysfs_init(); - hugetlb_register_all_nodes(); + hugetlb_cgroup_file_init(); return 0; } @@ -1943,13 +1941,6 @@ void __init hugetlb_add_hstate(unsigned h->next_nid_to_free = first_node(node_states[N_HIGH_MEMORY]); snprintf(h->name, HSTATE_NAME_LEN, "hugepages-%lukB", huge_page_size(h)/1024); - /* - * Add cgroup control files only if the huge page consists - * of more than two normal pages. This is because we use - * page[2].lru.next for storing cgoup details. - */ - if (order >= HUGETLB_CGROUP_MIN_ORDER) - hugetlb_cgroup_file_init(hugetlb_max_hstate - 1); parsed_hstate = h; } --- a/mm/hugetlb_cgroup.c +++ b/mm/hugetlb_cgroup.c @@ -340,7 +340,7 @@ static char *mem_fmt(char *buf, int size return buf; } -int __init hugetlb_cgroup_file_init(int idx) +static void __init __hugetlb_cgroup_file_init(int idx) { char buf[32]; struct cftype *cft; @@ -382,7 +382,22 @@ int __init hugetlb_cgroup_file_init(int WARN_ON(cgroup_add_cftypes(&hugetlb_subsys, h->cgroup_files)); - return 0; + return; +} + +void __init hugetlb_cgroup_file_init(void) +{ + struct hstate *h; + + for_each_hstate(h) { + /* + * Add cgroup control files only if the huge page consists + * of more than two normal pages. This is because we use + * page[2].lru.next for storing cgroup details. + */ + if (huge_page_order(h) >= HUGETLB_CGROUP_MIN_ORDER) + __hugetlb_cgroup_file_init(hstate_index(h)); + } } /*
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