void kmemcheck_alloc_shadow(struct page *page, int order, gfp_t flags, int node) { struct page *shadow; int pages; int i; pages = 1 << order; /* * With kmemcheck enabled, we need to allocate a memory area for the * shadow bits as well. */ shadow = alloc_pages_node(node, flags | __GFP_NOTRACK, order); if (!shadow) { if (printk_ratelimit()) printk(KERN_ERR "kmemcheck: failed to allocate " "shadow bitmap\n"); return; } for(i = 0; i < pages; ++i) page[i].shadow = page_address(&shadow[i]); /* * Mark it as non-present for the MMU so that our accesses to * this memory will trigger a page fault and let us analyze * the memory accesses. */ kmemcheck_hide_pages(page, pages); }
void kmemcheck_alloc_shadow(struct page *page, int order, gfp_t flags, int node) { struct page *shadow; int pages; int i; pages = 1 << order; shadow = alloc_pages_node(node, flags | __GFP_NOTRACK, order); if (!shadow) { if (printk_ratelimit()) printk(KERN_ERR "kmemcheck: failed to allocate " "shadow bitmap\n"); return; } for(i = 0; i < pages; ++i) page[i].shadow = page_address(&shadow[i]); kmemcheck_hide_pages(page, pages); }