From ca4424c920f574b7246ff1b6d83cfdfd709e42c8 Mon Sep 17 00:00:00 2001 From: Jiri Olsa Date: Thu, 12 Mar 2020 20:56:01 +0100 Subject: [PATCH] bpf: Move ksym_tnode to bpf_ksym Moving ksym_tnode list node to 'struct bpf_ksym' object, so the symbol itself can be chained and used in other objects like bpf_trampoline and bpf_dispatcher. We need bpf_ksym object to be linked both in bpf_kallsyms via lnode for /proc/kallsyms and in bpf_tree via tnode for bpf address lookup functions like __bpf_address_lookup or bpf_prog_kallsyms_find. Signed-off-by: Jiri Olsa Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20200312195610.346362-7-jolsa@kernel.org Signed-off-by: Alexei Starovoitov --- include/linux/bpf.h | 2 +- kernel/bpf/core.c | 24 ++++++++++-------------- 2 files changed, 11 insertions(+), 15 deletions(-) diff --git a/include/linux/bpf.h b/include/linux/bpf.h index 4fad2fa..68d66b0 100644 --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -477,6 +477,7 @@ struct bpf_ksym { unsigned long end; char name[KSYM_NAME_LEN]; struct list_head lnode; + struct latch_tree_node tnode; }; enum bpf_tramp_prog_type { @@ -659,7 +660,6 @@ struct bpf_prog_aux { void *jit_data; /* JIT specific data. arch dependent */ struct bpf_jit_poke_descriptor *poke_tab; u32 size_poke_tab; - struct latch_tree_node ksym_tnode; struct bpf_ksym ksym; const struct bpf_prog_ops *ops; struct bpf_map **used_maps; diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c index 5eb5d5b..ab1846c 100644 --- a/kernel/bpf/core.c +++ b/kernel/bpf/core.c @@ -572,31 +572,27 @@ bpf_prog_ksym_set_name(struct bpf_prog *prog) *sym = 0; } -static __always_inline unsigned long -bpf_get_prog_addr_start(struct latch_tree_node *n) +static unsigned long bpf_get_ksym_start(struct latch_tree_node *n) { - const struct bpf_prog_aux *aux; - - aux = container_of(n, struct bpf_prog_aux, ksym_tnode); - return aux->ksym.start; + return container_of(n, struct bpf_ksym, tnode)->start; } static __always_inline bool bpf_tree_less(struct latch_tree_node *a, struct latch_tree_node *b) { - return bpf_get_prog_addr_start(a) < bpf_get_prog_addr_start(b); + return bpf_get_ksym_start(a) < bpf_get_ksym_start(b); } static __always_inline int bpf_tree_comp(void *key, struct latch_tree_node *n) { unsigned long val = (unsigned long)key; - const struct bpf_prog_aux *aux; + const struct bpf_ksym *ksym; - aux = container_of(n, struct bpf_prog_aux, ksym_tnode); + ksym = container_of(n, struct bpf_ksym, tnode); - if (val < aux->ksym.start) + if (val < ksym->start) return -1; - if (val >= aux->ksym.end) + if (val >= ksym->end) return 1; return 0; @@ -615,7 +611,7 @@ static void bpf_prog_ksym_node_add(struct bpf_prog_aux *aux) { WARN_ON_ONCE(!list_empty(&aux->ksym.lnode)); list_add_tail_rcu(&aux->ksym.lnode, &bpf_kallsyms); - latch_tree_insert(&aux->ksym_tnode, &bpf_tree, &bpf_tree_ops); + latch_tree_insert(&aux->ksym.tnode, &bpf_tree, &bpf_tree_ops); } static void bpf_prog_ksym_node_del(struct bpf_prog_aux *aux) @@ -623,7 +619,7 @@ static void bpf_prog_ksym_node_del(struct bpf_prog_aux *aux) if (list_empty(&aux->ksym.lnode)) return; - latch_tree_erase(&aux->ksym_tnode, &bpf_tree, &bpf_tree_ops); + latch_tree_erase(&aux->ksym.tnode, &bpf_tree, &bpf_tree_ops); list_del_rcu(&aux->ksym.lnode); } @@ -668,7 +664,7 @@ static struct bpf_prog *bpf_prog_kallsyms_find(unsigned long addr) n = latch_tree_find((void *)addr, &bpf_tree, &bpf_tree_ops); return n ? - container_of(n, struct bpf_prog_aux, ksym_tnode)->prog : + container_of(n, struct bpf_prog_aux, ksym.tnode)->prog : NULL; } -- 2.7.4