diff options
| -rw-r--r-- | include/linux/hugetlb.h | 1 | ||||
| -rw-r--r-- | mm/hugetlb.c | 8 |
2 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h index 0f5813522224..628639422c5d 100644 --- a/include/linux/hugetlb.h +++ b/include/linux/hugetlb.h @@ -559,6 +559,7 @@ HPAGEFLAG(Freed, freed) #define HSTATE_NAME_LEN 32 /* Defines one hugetlb page size */ struct hstate { + struct mutex resize_lock; int next_nid_to_alloc; int next_nid_to_free; unsigned int order; diff --git a/mm/hugetlb.c b/mm/hugetlb.c index a5636e1593c5..067fd29a9d51 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -2621,6 +2621,11 @@ static int set_max_huge_pages(struct hstate *h, unsigned long count, int nid, else return -ENOMEM; + /* + * resize_lock mutex prevents concurrent adjustments to number of + * pages in hstate via the proc/sysfs interfaces. + */ + mutex_lock(&h->resize_lock); spin_lock(&hugetlb_lock); /* @@ -2653,6 +2658,7 @@ static int set_max_huge_pages(struct hstate *h, unsigned long count, int nid, if (hstate_is_gigantic(h) && !IS_ENABLED(CONFIG_CONTIG_ALLOC)) { if (count > persistent_huge_pages(h)) { spin_unlock(&hugetlb_lock); + mutex_unlock(&h->resize_lock); NODEMASK_FREE(node_alloc_noretry); return -EINVAL; } @@ -2727,6 +2733,7 @@ static int set_max_huge_pages(struct hstate *h, unsigned long count, int nid, out: h->max_huge_pages = persistent_huge_pages(h); spin_unlock(&hugetlb_lock); + mutex_unlock(&h->resize_lock); NODEMASK_FREE(node_alloc_noretry); @@ -3214,6 +3221,7 @@ void __init hugetlb_add_hstate(unsigned int order) BUG_ON(hugetlb_max_hstate >= HUGE_MAX_HSTATE); BUG_ON(order == 0); h = &hstates[hugetlb_max_hstate++]; + mutex_init(&h->resize_lock); h->order = order; h->mask = ~(huge_page_size(h) - 1); for (i = 0; i < MAX_NUMNODES; ++i) |