From c317ab71facc2cd0a94145973318a4c914e11acc Mon Sep 17 00:00:00 2001 From: Menglong Dong Date: Mon, 25 Apr 2022 21:32:47 +0800 Subject: bpf: Compute map_btf_id during build time For now, the field 'map_btf_id' in 'struct bpf_map_ops' for all map types are computed during vmlinux-btf init: btf_parse_vmlinux() -> btf_vmlinux_map_ids_init() It will lookup the btf_type according to the 'map_btf_name' field in 'struct bpf_map_ops'. This process can be done during build time, thanks to Jiri's resolve_btfids. selftest of map_ptr has passed: $96 map_ptr:OK Summary: 1/0 PASSED, 0 SKIPPED, 0 FAILED Reported-by: kernel test robot Signed-off-by: Menglong Dong Signed-off-by: Alexei Starovoitov --- kernel/bpf/queue_stack_maps.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-) (limited to 'kernel/bpf/queue_stack_maps.c') diff --git a/kernel/bpf/queue_stack_maps.c b/kernel/bpf/queue_stack_maps.c index f9c734aaa990..a1c0794ae49d 100644 --- a/kernel/bpf/queue_stack_maps.c +++ b/kernel/bpf/queue_stack_maps.c @@ -8,6 +8,7 @@ #include #include #include +#include #include "percpu_freelist.h" #define QUEUE_STACK_CREATE_FLAG_MASK \ @@ -247,7 +248,7 @@ static int queue_stack_map_get_next_key(struct bpf_map *map, void *key, return -EINVAL; } -static int queue_map_btf_id; +BTF_ID_LIST_SINGLE(queue_map_btf_ids, struct, bpf_queue_stack) const struct bpf_map_ops queue_map_ops = { .map_meta_equal = bpf_map_meta_equal, .map_alloc_check = queue_stack_map_alloc_check, @@ -260,11 +261,9 @@ const struct bpf_map_ops queue_map_ops = { .map_pop_elem = queue_map_pop_elem, .map_peek_elem = queue_map_peek_elem, .map_get_next_key = queue_stack_map_get_next_key, - .map_btf_name = "bpf_queue_stack", - .map_btf_id = &queue_map_btf_id, + .map_btf_id = &queue_map_btf_ids[0], }; -static int stack_map_btf_id; const struct bpf_map_ops stack_map_ops = { .map_meta_equal = bpf_map_meta_equal, .map_alloc_check = queue_stack_map_alloc_check, @@ -277,6 +276,5 @@ const struct bpf_map_ops stack_map_ops = { .map_pop_elem = stack_map_pop_elem, .map_peek_elem = stack_map_peek_elem, .map_get_next_key = queue_stack_map_get_next_key, - .map_btf_name = "bpf_queue_stack", - .map_btf_id = &stack_map_btf_id, + .map_btf_id = &queue_map_btf_ids[0], }; -- cgit v1.2.3 From 083818156d1e98f22b1ac612a3957bc553e7ba57 Mon Sep 17 00:00:00 2001 From: Yafang Shao Date: Wed, 10 Aug 2022 15:18:26 +0000 Subject: bpf: Remove unneeded memset in queue_stack_map creation __GFP_ZERO will clear the memory, so we don't need to memset it. Signed-off-by: Yafang Shao Link: https://lore.kernel.org/r/20220810151840.16394-2-laoar.shao@gmail.com Signed-off-by: Alexei Starovoitov --- kernel/bpf/queue_stack_maps.c | 2 -- 1 file changed, 2 deletions(-) (limited to 'kernel/bpf/queue_stack_maps.c') diff --git a/kernel/bpf/queue_stack_maps.c b/kernel/bpf/queue_stack_maps.c index a1c0794ae49d..8a5e060de63b 100644 --- a/kernel/bpf/queue_stack_maps.c +++ b/kernel/bpf/queue_stack_maps.c @@ -78,8 +78,6 @@ static struct bpf_map *queue_stack_map_alloc(union bpf_attr *attr) if (!qs) return ERR_PTR(-ENOMEM); - memset(qs, 0, sizeof(*qs)); - bpf_map_init_from_attr(&qs->map, attr); qs->size = size; -- cgit v1.2.3