#ifdef CONFIG_CMA
/* CMA stuff */
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index afef61656c1e..4e55aa38704f 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1058,6 +1058,7 @@ static void free_gigantic_page(struct page *page, unsigned int order)
free_contig_range(page_to_pfn(page), 1 << order);
}
+#ifdef CONFIG_CONTIG_ALLOC
static int __alloc_gigantic_page(unsigned long start_pfn,
unsigned long nr_pages, gfp_t gfp_mask)
{
@@ -1142,11 +1143,20 @@ static struct page *alloc_gigantic_page(struct hstate *h, gfp_t gfp_mask,
static void prep_new_huge_page(struct hstate *h, struct page *page, int nid);
static void prep_compound_gigantic_page(struct page *page, unsigned int order);
+#else /* !CONFIG_CONTIG_ALLOC */
+static struct page *alloc_gigantic_page(struct hstate *h, gfp_t gfp_mask,
+ int nid, nodemask_t *nodemask)
+{
+ return NULL;
+}
+#endif /* CONFIG_CONTIG_ALLOC */
#else /* !CONFIG_ARCH_HAS_GIGANTIC_PAGE */
-static inline bool gigantic_page_supported(void) { return false; }
static struct page *alloc_gigantic_page(struct hstate *h, gfp_t gfp_mask,
- int nid, nodemask_t *nodemask) { return NULL; }
+ int nid, nodemask_t *nodemask)
+{
+ return NULL;
+}
static inline void free_gigantic_page(struct page *page, unsigned int order) { }
static inline void destroy_compound_gigantic_page(struct page *page,
unsigned int order) { }
@@ -1156,7 +1166,7 @@ static void update_and_free_page(struct hstate *h, struct page *page)
{
int i;
- if (hstate_is_gigantic(h) && !gigantic_page_supported())
+ if (hstate_is_gigantic(h) && !gigantic_page_runtime_supported())
return;
h->nr_huge_pages--;
@@ -2276,13 +2286,27 @@ static int adjust_pool_surplus(struct hstate *h, nodemask_t *nodes_allowed,
}
#define persistent_huge_pages(h) (h->nr_huge_pages - h->surplus_huge_pages)
-static unsigned long set_max_huge_pages(struct hstate *h, unsigned long count,
- nodemask_t *nodes_allowed)
+static int set_max_huge_pages(struct hstate *h, unsigned long count,
+ nodemask_t *nodes_allowed)
{
unsigned long min_count, ret;
- if (hstate_is_gigantic(h) && !gigantic_page_supported())
- return h->max_huge_pages;
+ spin_lock(&hugetlb_lock);
+
+ /*
+ * Gigantic pages runtime allocation depend on the capability for large
+ * page range allocation.
+ * If the system does not provide this feature, return an error when
+ * the user tries to allocate gigantic pages but let the user free the
+ * boottime allocated gigantic pages.
+ */
+ if (hstate_is_gigantic(h) && !IS_ENABLED(CONFIG_CONTIG_ALLOC)) {
+ if (count > persistent_huge_pages(h)) {
+ spin_unlock(&hugetlb_lock);
+ return -EINVAL;
+ }
+ /* Fall through to decrease pool */
+ }
/*
* Increase the pool size
@@ -2295,7 +2319,6 @@ static unsigned long set_max_huge_pages(struct hstate *h, unsigned long count,
* pool might be one hugepage larger than it needs to be, but
* within all the constraints specified by the sysctls.
*/
- spin_lock(&hugetlb_lock);
while (h->surplus_huge_pages && count > persistent_huge_pages(h)) {
if (!adjust_pool_surplus(h, nodes_allowed, -1))
break;
@@ -2350,9 +2373,10 @@ static unsigned long set_max_huge_pages(struct hstate *h, unsigned long count,
break;
}
out:
- ret = persistent_huge_pages(h);
+ h->max_huge_pages = persistent_huge_pages(h);
spin_unlock(&hugetlb_lock);
- return ret;
+
+ return 0;
}
#define HSTATE_ATTR_RO(_name) \
@@ -2404,7 +2428,7 @@ static ssize_t __nr_hugepages_store_common(bool obey_mempolicy,
int err;
NODEMASK_ALLOC(nodemask_t, nodes_allowed, GFP_KERNEL | __GFP_NORETRY);
- if (hstate_is_gigantic(h) && !gigantic_page_supported()) {
+ if (hstate_is_gigantic(h) && !gigantic_page_runtime_supported()) {
err = -EINVAL;
goto out;
}
@@ -2428,15 +2452,13 @@ static ssize_t __nr_hugepages_store_common(bool obey_mempolicy,
} else
nodes_allowed = &node_states[N_MEMORY];
- h->max_huge_pages = set_max_huge_pages(h, count, nodes_allowed);
+ err = set_max_huge_pages(h, count, nodes_allowed);
+out:
if (nodes_allowed != &node_states[N_MEMORY])
NODEMASK_FREE(nodes_allowed);
- return len;
-out:
- NODEMASK_FREE(nodes_allowed);
- return err;
+ return err ? err : len;
}
static ssize_t nr_hugepages_store_common(bool obey_mempolicy,
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index ac9c45ffb344..a4547d90fa7a 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -8234,8 +8234,9 @@ int alloc_contig_range(unsigned long start, unsigned long end,
pfn_max_align_up(end), migratetype);
return ret;
}
+#endif /* CONFIG_CONTIG_ALLOC */
-void free_contig_range(unsigned long pfn, unsigned nr_pages)
+void free_contig_range(unsigned long pfn, unsigned int nr_pages)
{
unsigned int count = 0;
@@ -8247,7 +8248,6 @@ void free_contig_range(unsigned long pfn, unsigned nr_pages)
}
WARN(count != 0, "%d pages are still in use!\n", count);
}
-#endif
#ifdef CONFIG_MEMORY_HOTPLUG
/*
