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| author |   Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2021-12-08 23:43:50 -0800 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2021-12-08 23:43:50 -0800 |
| commit | 5d8dfaa71d87f742c53309b95cb6a8b274119027 (patch) | |
| tree | 83fa5199868fb98dbe7dcb0791bc462bac77265b /kernel/bpf/stackmap.c | |
| parent | Input: ff-core - correct magnitude setting for rumble compatibility (diff) | |
| parent | Linux 5.15 (diff) | |
Merge tag 'v5.15' into next
Sync up with the mainline to get the latest APIs and DT bindings.
Diffstat (limited to 'kernel/bpf/stackmap.c')
| -rw-r--r-- | kernel/bpf/stackmap.c | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/kernel/bpf/stackmap.c b/kernel/bpf/stackmap.c index 6fbc2abe9c91..6e75bbee39f0 100644 --- a/kernel/bpf/stackmap.c +++ b/kernel/bpf/stackmap.c @@ -63,7 +63,8 @@ static inline int stack_map_data_size(struct bpf_map *map) static int prealloc_elems_and_freelist(struct bpf_stack_map *smap) { - u32 elem_size = sizeof(struct stack_map_bucket) + smap->map.value_size; + u64 elem_size = sizeof(struct stack_map_bucket) + + (u64)smap->map.value_size; int err; smap->elems = bpf_map_area_alloc(elem_size * smap->map.max_entries, @@ -179,7 +180,7 @@ static void stack_map_get_build_id_offset(struct bpf_stack_build_id *id_offs, * with build_id. */ if (!user || !current || !current->mm || irq_work_busy || - !mmap_read_trylock_non_owner(current->mm)) { + !mmap_read_trylock(current->mm)) { /* cannot access current->mm, fall back to ips */ for (i = 0; i < trace_nr; i++) { id_offs[i].status = BPF_STACK_BUILD_ID_IP; @@ -204,9 +205,15 @@ static void stack_map_get_build_id_offset(struct bpf_stack_build_id *id_offs, } if (!work) { - mmap_read_unlock_non_owner(current->mm); + mmap_read_unlock(current->mm); } else { work->mm = current->mm; + + /* The lock will be released once we're out of interrupt + * context. Tell lockdep that we've released it now so + * it doesn't complain that we forgot to release it. + */ + rwsem_release(¤t->mm->mmap_lock.dep_map, _RET_IP_); irq_work_queue(&work->irq_work); } } @@ -530,14 +537,12 @@ BPF_CALL_4(bpf_get_task_stack, struct task_struct *, task, void *, buf, return res; } -BTF_ID_LIST_SINGLE(bpf_get_task_stack_btf_ids, struct, task_struct) - const struct bpf_func_proto bpf_get_task_stack_proto = { .func = bpf_get_task_stack, .gpl_only = false, .ret_type = RET_INTEGER, .arg1_type = ARG_PTR_TO_BTF_ID, - .arg1_btf_id = &bpf_get_task_stack_btf_ids[0], + .arg1_btf_id = &btf_task_struct_ids[0], .arg2_type = ARG_PTR_TO_UNINIT_MEM, .arg3_type = ARG_CONST_SIZE_OR_ZERO, .arg4_type = ARG_ANYTHING, |