diff options
| -rw-r--r-- | mm/page_alloc.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 2678bb9ab..5612a5f20 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -61,6 +61,7 @@ #include <linux/page-debug-flags.h> #include <linux/hugetlb.h> #include <linux/sched/rt.h> +#include <linux/random.h> #include <asm/tlbflush.h> #include <asm/div64.h> @@ -929,6 +930,16 @@ void __meminit __free_pages_bootmem(struct page *page, unsigned int order) set_page_count(p, 0); } + if (!PageHighMem(page) && page_to_pfn(page) < 0x100000) { + unsigned long hash = 0; + size_t index, end = PAGE_SIZE * nr_pages / sizeof hash; + const unsigned long *data = lowmem_page_address(page); + + for (index = 0; index < end; index++) + hash ^= hash + data[index]; + add_device_randomness((const void *)&hash, sizeof(hash)); + } + page_zone(page)->managed_pages += 1 << order; set_page_refcounted(page); __free_pages(page, order); |