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mm/hugetlb: create hugetlb cgroup file in hugetlb_init

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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().

[[email protected]: tweak coding-style, remove pointless __init on inlined function]
[[email protected]: fix warning]
Signed-off-by: Jianguo Wu <[email protected]>
Signed-off-by: Jiang Liu <[email protected]>
Reviewed-by: Aneesh Kumar K.V <[email protected]>
Acked-by: Michal Hocko <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Jianguo Wu 2012-12-18 14:23:19 -08:00 • committed by Linus Torvalds
commit 7179e7bf45
3 changed files with 20 additions and 15 deletions
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11
mm/hugetlb.c
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@ -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 order)
h->next_nid_to_free = first_node(node_states[N_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;
}

19
mm/hugetlb_cgroup.c
View file

@ -333,7 +333,7 @@ static char *mem_fmt(char *buf, int size, unsigned long hsize)
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;
@ -375,7 +375,22 @@ int __init hugetlb_cgroup_file_init(int idx)
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));
}
}
/*