diff options
Diffstat (limited to 'arch/arm64/kvm/hyp/nvhe/list_debug.c')
-rw-r--r-- | arch/arm64/kvm/hyp/nvhe/list_debug.c | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/arch/arm64/kvm/hyp/nvhe/list_debug.c b/arch/arm64/kvm/hyp/nvhe/list_debug.c new file mode 100644 index 000000000000..d68abd7ea124 --- /dev/null +++ b/arch/arm64/kvm/hyp/nvhe/list_debug.c @@ -0,0 +1,54 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2022 - Google LLC + * Author: Keir Fraser <keirf@google.com> + */ + +#include <linux/list.h> +#include <linux/bug.h> + +static inline __must_check bool nvhe_check_data_corruption(bool v) +{ + return v; +} + +#define NVHE_CHECK_DATA_CORRUPTION(condition) \ + nvhe_check_data_corruption(({ \ + bool corruption = unlikely(condition); \ + if (corruption) { \ + if (IS_ENABLED(CONFIG_BUG_ON_DATA_CORRUPTION)) { \ + BUG_ON(1); \ + } else \ + WARN_ON(1); \ + } \ + corruption; \ + })) + +/* The predicates checked here are taken from lib/list_debug.c. */ + +bool __list_add_valid(struct list_head *new, struct list_head *prev, + struct list_head *next) +{ + if (NVHE_CHECK_DATA_CORRUPTION(next->prev != prev) || + NVHE_CHECK_DATA_CORRUPTION(prev->next != next) || + NVHE_CHECK_DATA_CORRUPTION(new == prev || new == next)) + return false; + + return true; +} + +bool __list_del_entry_valid(struct list_head *entry) +{ + struct list_head *prev, *next; + + prev = entry->prev; + next = entry->next; + + if (NVHE_CHECK_DATA_CORRUPTION(next == LIST_POISON1) || + NVHE_CHECK_DATA_CORRUPTION(prev == LIST_POISON2) || + NVHE_CHECK_DATA_CORRUPTION(prev->next != entry) || + NVHE_CHECK_DATA_CORRUPTION(next->prev != entry)) + return false; + + return true; +} |