diff options
Diffstat (limited to 'mm/util.c')
| -rw-r--r-- | mm/util.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/mm/util.c b/mm/util.c index 99c6cc77de9e..499b6b5767ed 100644 --- a/mm/util.c +++ b/mm/util.c @@ -593,6 +593,10 @@ void *kvmalloc_node(size_t size, gfp_t flags, int node) if (ret || size <= PAGE_SIZE) return ret; + /* Don't even allow crazy sizes */ + if (WARN_ON_ONCE(size > INT_MAX)) + return NULL; + return __vmalloc_node(size, 1, flags, node, __builtin_return_address(0)); } @@ -635,6 +639,21 @@ void kvfree_sensitive(const void *addr, size_t len) } EXPORT_SYMBOL(kvfree_sensitive); +void *kvrealloc(const void *p, size_t oldsize, size_t newsize, gfp_t flags) +{ + void *newp; + + if (oldsize >= newsize) + return (void *)p; + newp = kvmalloc(newsize, flags); + if (!newp) + return NULL; + memcpy(newp, p, oldsize); + kvfree(p); + return newp; +} +EXPORT_SYMBOL(kvrealloc); + static inline void *__page_rmapping(struct page *page) { unsigned long mapping; @@ -731,6 +750,16 @@ int __page_mapcount(struct page *page) } EXPORT_SYMBOL_GPL(__page_mapcount); +void copy_huge_page(struct page *dst, struct page *src) +{ + unsigned i, nr = compound_nr(src); + + for (i = 0; i < nr; i++) { + cond_resched(); + copy_highpage(nth_page(dst, i), nth_page(src, i)); + } +} + int sysctl_overcommit_memory __read_mostly = OVERCOMMIT_GUESS; int sysctl_overcommit_ratio __read_mostly = 50; unsigned long sysctl_overcommit_kbytes __read_mostly; |