aya: fix clippy warnings

aya/src/bpf.rs

@@ -280,7 +280,7 @@ impl Bpf {
     /// }
     /// # Ok::<(), aya::BpfError>(())
     /// ```
-    pub fn maps<'a>(&'a self) -> impl Iterator<Item = (&'a str, Result<MapRef, MapError>)> + 'a {
+    pub fn maps(&self) -> impl Iterator<Item = (&str, Result<MapRef, MapError>)> {
         let ret = self.maps.iter().map(|(name, lock)| {
             (
                 name.as_str(),

aya/src/generated/mod.rs

@@ -1,4 +1,4 @@
-#![allow(dead_code, non_camel_case_types, non_snake_case)]
+#![allow(dead_code, non_camel_case_types, non_snake_case, clippy::all)]
 
 mod btf_internal_bindings;
 #[cfg(target_arch = "aarch64")]

aya/src/lib.rs

@@ -30,6 +30,7 @@
 //! [tokio]: https://docs.rs/tokio
 //! [async-std]: https://docs.rs/async-std
 #![deny(clippy::all)]
+#![allow(clippy::missing_safety_doc, clippy::len_without_is_empty)]
 
 #[macro_use]
 extern crate lazy_static;

aya/src/maps/array/array.rs

@@ -44,7 +44,7 @@ impl<T: Deref<Target = Map>, V: Pod> Array<T, V> {
         if map_type != BPF_MAP_TYPE_ARRAY as u32 {
             return Err(MapError::InvalidMapType {
                 map_type: map_type as u32,
-            })?;
+            });
         }
         let expected = mem::size_of::<u32>();
         let size = map.obj.def.key_size as usize;
@@ -94,7 +94,7 @@ impl<T: Deref<Target = Map>, V: Pod> Array<T, V> {
 
     /// An iterator over the elements of the array. The iterator item type is `Result<V,
     /// MapError>`.
-    pub unsafe fn iter<'a>(&'a self) -> impl Iterator<Item = Result<V, MapError>> + 'a {
+    pub unsafe fn iter(&self) -> impl Iterator<Item = Result<V, MapError>> + '_ {
         (0..self.len()).map(move |i| self.get(&i, 0))
     }
 

aya/src/maps/array/mod.rs

@@ -1,4 +1,5 @@
 //! Array types.
+#[allow(clippy::module_inception)]
 mod array;
 mod per_cpu_array;
 mod program_array;

aya/src/maps/array/per_cpu_array.rs

@@ -63,7 +63,7 @@ impl<T: Deref<Target = Map>, V: Pod> PerCpuArray<T, V> {
         if map_type != BPF_MAP_TYPE_PERCPU_ARRAY as u32 {
             return Err(MapError::InvalidMapType {
                 map_type: map_type as u32,
-            })?;
+            });
         }
         let expected = mem::size_of::<u32>();
         let size = map.obj.def.key_size as usize;
@@ -113,9 +113,7 @@ impl<T: Deref<Target = Map>, V: Pod> PerCpuArray<T, V> {
 
     /// An iterator over the elements of the array. The iterator item type is
     /// `Result<PerCpuValues<V>, MapError>`.
-    pub unsafe fn iter<'a>(
-        &'a self,
-    ) -> impl Iterator<Item = Result<PerCpuValues<V>, MapError>> + 'a {
+    pub unsafe fn iter(&self) -> impl Iterator<Item = Result<PerCpuValues<V>, MapError>> + '_ {
         (0..self.len()).map(move |i| self.get(&i, 0))
     }
 

aya/src/maps/array/program_array.rs

@@ -59,7 +59,7 @@ impl<T: Deref<Target = Map>> ProgramArray<T> {
         if map_type != BPF_MAP_TYPE_PROG_ARRAY as u32 {
             return Err(MapError::InvalidMapType {
                 map_type: map_type as u32,
-            })?;
+            });
         }
         let expected = mem::size_of::<u32>();
         let size = map.obj.def.key_size as usize;

aya/src/maps/hash_map/hash_map.rs

@@ -48,7 +48,7 @@ impl<T: Deref<Target = Map>, K: Pod, V: Pod> HashMap<T, K, V> {
         if map_type != BPF_MAP_TYPE_HASH as u32 && map_type != BPF_MAP_TYPE_LRU_HASH as u32 {
             return Err(MapError::InvalidMapType {
                 map_type: map_type as u32,
-            })?;
+            });
         }
         hash_map::check_kv_size::<K, V>(&map)?;
         let _ = map.fd_or_err()?;
@@ -426,10 +426,10 @@ mod tests {
     }
 
     fn get_next_key(attr: &bpf_attr) -> SysResult {
-        match bpf_key(&attr) {
-            None => set_next_key(&attr, 10),
-            Some(10) => set_next_key(&attr, 20),
-            Some(20) => set_next_key(&attr, 30),
+        match bpf_key(attr) {
+            None => set_next_key(attr, 10),
+            Some(10) => set_next_key(attr, 20),
+            Some(20) => set_next_key(attr, 30),
             Some(30) => return sys_error(ENOENT),
             Some(_) => return sys_error(EFAULT),
         };
@@ -438,10 +438,10 @@ mod tests {
     }
 
     fn lookup_elem(attr: &bpf_attr) -> SysResult {
-        match bpf_key(&attr) {
-            Some(10) => set_ret(&attr, 100),
-            Some(20) => set_ret(&attr, 200),
-            Some(30) => set_ret(&attr, 300),
+        match bpf_key(attr) {
+            Some(10) => set_ret(attr, 100),
+            Some(20) => set_ret(attr, 200),
+            Some(30) => set_ret(attr, 300),
             Some(_) => return sys_error(ENOENT),
             None => return sys_error(EFAULT),
         };
@@ -455,7 +455,7 @@ mod tests {
             Syscall::Bpf {
                 cmd: bpf_cmd::BPF_MAP_GET_NEXT_KEY,
                 attr,
-            } => get_next_key(&attr),
+            } => get_next_key(attr),
             _ => sys_error(EFAULT),
         });
 
@@ -476,9 +476,9 @@ mod tests {
                 cmd: bpf_cmd::BPF_MAP_GET_NEXT_KEY,
                 attr,
             } => {
-                match bpf_key(&attr) {
-                    None => set_next_key(&attr, 10),
-                    Some(10) => set_next_key(&attr, 20),
+                match bpf_key(attr) {
+                    None => set_next_key(attr, 10),
+                    Some(10) => set_next_key(attr, 20),
                     Some(_) => return sys_error(EFAULT),
                 };
 
@@ -508,11 +508,11 @@ mod tests {
             Syscall::Bpf {
                 cmd: bpf_cmd::BPF_MAP_GET_NEXT_KEY,
                 attr,
-            } => get_next_key(&attr),
+            } => get_next_key(attr),
             Syscall::Bpf {
                 cmd: bpf_cmd::BPF_MAP_LOOKUP_ELEM,
                 attr,
-            } => lookup_elem(&attr),
+            } => lookup_elem(attr),
             _ => sys_error(EFAULT),
         });
         let map = Map {
@@ -530,15 +530,15 @@ mod tests {
             Syscall::Bpf {
                 cmd: bpf_cmd::BPF_MAP_GET_NEXT_KEY,
                 attr,
-            } => get_next_key(&attr),
+            } => get_next_key(attr),
             Syscall::Bpf {
                 cmd: bpf_cmd::BPF_MAP_LOOKUP_ELEM,
                 attr,
             } => {
-                match bpf_key(&attr) {
-                    Some(10) => set_ret(&attr, 100),
+                match bpf_key(attr) {
+                    Some(10) => set_ret(attr, 100),
                     Some(20) => return sys_error(ENOENT),
-                    Some(30) => set_ret(&attr, 300),
+                    Some(30) => set_ret(attr, 300),
                     Some(_) => return sys_error(ENOENT),
                     None => return sys_error(EFAULT),
                 };
@@ -564,9 +564,9 @@ mod tests {
                 cmd: bpf_cmd::BPF_MAP_GET_NEXT_KEY,
                 attr,
             } => {
-                match bpf_key(&attr) {
-                    None => set_next_key(&attr, 10),
-                    Some(10) => set_next_key(&attr, 20),
+                match bpf_key(attr) {
+                    None => set_next_key(attr, 10),
+                    Some(10) => set_next_key(attr, 20),
                     Some(20) => return sys_error(EFAULT),
                     Some(30) => return sys_error(ENOENT),
                     Some(_) => panic!(),
@@ -577,7 +577,7 @@ mod tests {
             Syscall::Bpf {
                 cmd: bpf_cmd::BPF_MAP_LOOKUP_ELEM,
                 attr,
-            } => lookup_elem(&attr),
+            } => lookup_elem(attr),
             _ => sys_error(EFAULT),
         });
         let map = Map {
@@ -602,15 +602,15 @@ mod tests {
             Syscall::Bpf {
                 cmd: bpf_cmd::BPF_MAP_GET_NEXT_KEY,
                 attr,
-            } => get_next_key(&attr),
+            } => get_next_key(attr),
             Syscall::Bpf {
                 cmd: bpf_cmd::BPF_MAP_LOOKUP_ELEM,
                 attr,
             } => {
-                match bpf_key(&attr) {
-                    Some(10) => set_ret(&attr, 100),
+                match bpf_key(attr) {
+                    Some(10) => set_ret(attr, 100),
                     Some(20) => return sys_error(EFAULT),
-                    Some(30) => set_ret(&attr, 300),
+                    Some(30) => set_ret(attr, 300),
                     Some(_) => return sys_error(ENOENT),
                     None => return sys_error(EFAULT),
                 };

aya/src/maps/hash_map/mod.rs

@@ -6,6 +6,7 @@ use crate::{
     sys::{bpf_map_delete_elem, bpf_map_update_elem},
 };
 
+#[allow(clippy::module_inception)]
 mod hash_map;
 mod per_cpu_hash_map;
 
@@ -20,9 +21,10 @@ pub(crate) fn check_kv_size<K, V>(map: &Map) -> Result<(), MapError> {
     }
     let size = mem::size_of::<V>();
     let expected = map.obj.def.value_size as usize;
-    Ok(if size != expected {
+    if size != expected {
         return Err(MapError::InvalidValueSize { size, expected });
-    })
+    };
+    Ok(())
 }
 
 pub(crate) fn insert<K, V>(map: &mut Map, key: K, value: V, flags: u64) -> Result<(), MapError> {

aya/src/maps/hash_map/per_cpu_hash_map.rs

@@ -60,7 +60,7 @@ impl<T: Deref<Target = Map>, K: Pod, V: Pod> PerCpuHashMap<T, K, V> {
         {
             return Err(MapError::InvalidMapType {
                 map_type: map_type as u32,
-            })?;
+            });
         }
         hash_map::check_kv_size::<K, V>(&map)?;
         let _ = map.fd_or_err()?;

aya/src/maps/mod.rs

@@ -134,7 +134,7 @@ impl Map {
     pub fn create(&mut self) -> Result<RawFd, MapError> {
         let name = self.obj.name.clone();
         if self.fd.is_some() {
-            return Err(MapError::AlreadyCreated { name: name.clone() });
+            return Err(MapError::AlreadyCreated { name });
         }
 
         let c_name =
@@ -210,19 +210,19 @@ impl<K: Pod> Iterator for MapKeys<'_, K> {
         match bpf_map_get_next_key(fd, self.key.as_ref()) {
             Ok(Some(key)) => {
                 self.key = Some(key);
-                return Some(Ok(key));
+                Some(Ok(key))
             }
             Ok(None) => {
                 self.key = None;
-                return None;
+                None
             }
             Err((code, io_error)) => {
                 self.err = true;
-                return Some(Err(MapError::SyscallError {
+                Some(Err(MapError::SyscallError {
                     call: "bpf_map_get_next_key".to_owned(),
                     code,
                     io_error,
-                }));
+                }))
             }
         }
     }
@@ -366,7 +366,7 @@ impl<T: Pod> TryFrom<Vec<T>> for PerCpuValues<T> {
 
 impl<T: Pod> PerCpuValues<T> {
     pub(crate) fn alloc_kernel_mem() -> Result<PerCpuKernelMem, io::Error> {
-        let value_size = mem::size_of::<T>() + 7 & !7;
+        let value_size = (mem::size_of::<T>() + 7) & !7;
         Ok(PerCpuKernelMem {
             bytes: vec![0u8; nr_cpus()? * value_size],
         })
@@ -374,7 +374,7 @@ impl<T: Pod> PerCpuValues<T> {
 
     pub(crate) unsafe fn from_kernel_mem(mem: PerCpuKernelMem) -> PerCpuValues<T> {
         let mem_ptr = mem.bytes.as_ptr() as usize;
-        let value_size = mem::size_of::<T>() + 7 & !7;
+        let value_size = (mem::size_of::<T>() + 7) & !7;
         let mut values = Vec::new();
         let mut offset = 0;
         while offset < mem.bytes.len() {
@@ -387,10 +387,10 @@ impl<T: Pod> PerCpuValues<T> {
         }
     }
 
-    pub(crate) fn into_kernel_mem(&self) -> Result<PerCpuKernelMem, io::Error> {
+    pub(crate) fn build_kernel_mem(&self) -> Result<PerCpuKernelMem, io::Error> {
         let mut mem = PerCpuValues::<T>::alloc_kernel_mem()?;
         let mem_ptr = mem.as_mut_ptr() as usize;
-        let value_size = mem::size_of::<T>() + 7 & !7;
+        let value_size = (mem::size_of::<T>() + 7) & !7;
         for i in 0..self.values.len() {
             unsafe { ptr::write_unaligned((mem_ptr + i * value_size) as *mut _, self.values[i]) };
         }
@@ -459,9 +459,7 @@ mod tests {
 
     #[test]
     fn test_create_failed() {
-        override_syscall(|_| {
-            return Err((-42, io::Error::from_raw_os_error(EFAULT)));
-        });
+        override_syscall(|_| Err((-42, io::Error::from_raw_os_error(EFAULT))));
 
         let mut map = new_map("foo");
         let ret = map.create();

aya/src/maps/perf/perf_buffer.rs

@@ -250,7 +250,7 @@ impl PerfBuffer {
         atomic::fence(Ordering::SeqCst);
         unsafe { (*header).data_tail = tail as u64 };
 
-        return Ok(events);
+        Ok(events)
     }
 }
 

aya/src/maps/perf/perf_event_array.rs

@@ -171,7 +171,7 @@ impl<T: DerefMut<Target = Map>> PerfEventArray<T> {
         if map_type != BPF_MAP_TYPE_PERF_EVENT_ARRAY as u32 {
             return Err(MapError::InvalidMapType {
                 map_type: map_type as u32,
-            })?;
+            });
         }
         let _fd = map.fd_or_err()?;
 

aya/src/maps/queue.rs

@@ -43,7 +43,7 @@ impl<T: Deref<Target = Map>, V: Pod> Queue<T, V> {
         if map_type != BPF_MAP_TYPE_QUEUE as u32 {
             return Err(MapError::InvalidMapType {
                 map_type: map_type as u32,
-            })?;
+            });
         }
         let expected = 0;
         let size = map.obj.def.key_size as usize;

aya/src/maps/sock/sock_hash.rs

@@ -75,7 +75,7 @@ impl<T: Deref<Target = Map>, K: Pod> SockHash<T, K> {
         if map_type != BPF_MAP_TYPE_SOCKHASH as u32 {
             return Err(MapError::InvalidMapType {
                 map_type: map_type as u32,
-            })?;
+            });
         }
         hash_map::check_kv_size::<K, u32>(&map)?;
         let _ = map.fd_or_err()?;

aya/src/maps/sock/sock_map.rs

@@ -51,7 +51,7 @@ impl<T: Deref<Target = Map>> SockMap<T> {
         if map_type != BPF_MAP_TYPE_SOCKMAP as u32 {
             return Err(MapError::InvalidMapType {
                 map_type: map_type as u32,
-            })?;
+            });
         }
         let expected = mem::size_of::<u32>();
         let size = map.obj.def.key_size as usize;

aya/src/maps/stack.rs

@@ -43,7 +43,7 @@ impl<T: Deref<Target = Map>, V: Pod> Stack<T, V> {
         if map_type != BPF_MAP_TYPE_STACK as u32 {
             return Err(MapError::InvalidMapType {
                 map_type: map_type as u32,
-            })?;
+            });
         }
         let expected = 0;
         let size = map.obj.def.key_size as usize;

aya/src/maps/stack_trace.rs

@@ -77,7 +77,7 @@ impl<T: Deref<Target = Map>> StackTraceMap<T> {
         if map_type != BPF_MAP_TYPE_STACK_TRACE as u32 {
             return Err(MapError::InvalidMapType {
                 map_type: map_type as u32,
-            })?;
+            });
         }
         let expected = mem::size_of::<u32>();
         let size = map.obj.def.key_size as usize;

aya/src/obj/btf/btf.rs

@@ -215,7 +215,7 @@ impl Btf {
 
     pub(crate) fn type_name(&self, ty: &BtfType) -> Result<Option<Cow<'_, str>>, BtfError> {
         ty.name_offset()
-            .map(|off| Ok(self.string_at(off)?))
+            .map(|off| self.string_at(off))
             .transpose()
     }
 

aya/src/obj/btf/mod.rs

@@ -1,3 +1,4 @@
+#[allow(clippy::module_inception)]
 mod btf;
 mod relocation;
 mod types;

aya/src/obj/btf/relocation.rs

@@ -162,7 +162,7 @@ impl Object {
             let section_name = local_btf.string_at(*sec_name_off)?;
 
             // FIXME
-            let parts = section_name.split("/").collect::<Vec<_>>();
+            let parts = section_name.split('/').collect::<Vec<_>>();
             if parts.len() < 2 {
                 continue;
             }
@@ -182,7 +182,7 @@ impl Object {
                 &mut candidates_cache,
             ) {
                 Ok(_) => {}
-                Err(ErrorWrapper::BtfError(e)) => return Err(e)?,
+                Err(ErrorWrapper::BtfError(e)) => return Err(e.into()),
                 Err(ErrorWrapper::RelocationError(error)) => {
                     return Err(BpfError::RelocationError {
                         function: section_name.to_owned(),
@@ -211,7 +211,8 @@ fn relocate_btf_program<'target>(
                 index: ins_index,
                 num_instructions: instructions.len(),
                 relocation_number: rel.number,
-            })?;
+            }
+            .into());
         }
 
         let local_ty = local_btf.type_by_id(rel.type_id)?;
@@ -257,7 +258,7 @@ fn relocate_btf_program<'target>(
                     if cand_spec.bit_offset != target_spec.bit_offset
                         || cand_comp_rel.target.value != target_comp_rel.target.value
                     {
-                        Some(cand_name.clone())
+                        Some(cand_name)
                     } else {
                         None
                     }
@@ -267,7 +268,8 @@ fn relocate_btf_program<'target>(
                 return Err(RelocationError::ConflictingCandidates {
                     type_name: local_name.to_string(),
                     candidates: conflicts,
-                })?;
+                }
+                .into());
             }
             target_comp_rel
         } else {
@@ -277,7 +279,7 @@ fn relocate_btf_program<'target>(
             ComputedRelocation::new(rel, &local_spec, None)?
         };
 
-        comp_rel.apply(program, rel, local_btf, &target_btf)?;
+        comp_rel.apply(program, rel, local_btf, target_btf)?;
     }
 
     Ok(())
@@ -305,7 +307,7 @@ fn find_candidates<'target>(
 
         candidates.push(Candidate {
             name: name.to_owned(),
-            btf: &target_btf,
+            btf: target_btf,
             ty,
             type_id: type_id as u32,
         });
@@ -381,7 +383,7 @@ fn match_candidate<'target>(
                 if accessor.name.is_some() {
                     if let Some(next_id) = match_member(
                         local_spec.btf,
-                        &local_spec,
+                        local_spec,
                         accessor,
                         candidate.btf,
                         target_id,
@@ -419,7 +421,8 @@ fn match_candidate<'target>(
                     if target_spec.parts.len() == MAX_SPEC_LEN {
                         return Err(RelocationError::MaximumNestingLevelReached {
                             type_name: Some(candidate.name.clone()),
-                        })?;
+                        }
+                        .into());
                     }
 
                     target_spec.parts.push(accessor.index);
@@ -470,13 +473,14 @@ fn match_member<'local, 'target>(
             let root_ty = target_spec.btf.type_by_id(target_spec.root_type_id)?;
             return Err(RelocationError::MaximumNestingLevelReached {
                 type_name: target_spec.btf.err_type_name(root_ty),
-            })?;
+            }
+            .into());
         }
 
         let bit_offset = member_bit_offset(target_ty.info().unwrap(), target_member);
         let target_name = &*target_btf.string_at(target_member.name_off)?;
 
-        if target_name == "" {
+        if target_name.is_empty() {
             let ret = match_member(
                 local_btf,
                 local_spec,
@@ -532,7 +536,7 @@ impl<'a> AccessSpec<'a> {
         relocation: Relocation,
     ) -> Result<AccessSpec<'a>, ErrorWrapper> {
         let parts = spec
-            .split(":")
+            .split(':')
             .map(|s| s.parse::<usize>())
             .collect::<Result<Vec<_>, _>>()
             .map_err(|_| RelocationError::InvalidAccessString {
@@ -550,7 +554,8 @@ impl<'a> AccessSpec<'a> {
                 if parts != [0] {
                     return Err(RelocationError::InvalidAccessString {
                         access_str: spec.to_string(),
-                    })?;
+                    }
+                    .into());
                 }
                 AccessSpec {
                     btf,
@@ -566,17 +571,19 @@ impl<'a> AccessSpec<'a> {
                     if parts.len() != 1 {
                         return Err(RelocationError::InvalidAccessString {
                             access_str: spec.to_string(),
-                        })?;
+                        }
+                        .into());
                     }
                     let index = parts[0];
                     if index >= members.len() {
                         return Err(RelocationError::InvalidAccessIndex {
                             type_name: btf.err_type_name(ty),
                             spec: spec.to_string(),
-                            index: index,
+                            index,
                             max_index: members.len(),
                             error: "tried to access nonexistant enum variant".to_string(),
-                        })?;
+                        }
+                        .into());
                     }
                     let accessors = vec![Accessor {
                         type_id,
@@ -599,7 +606,8 @@ impl<'a> AccessSpec<'a> {
                         relocation_kind: format!("{:?}", relocation.kind),
                         type_kind: format!("{:?}", ty.kind()?.unwrap()),
                         error: "enum relocation on non-enum type".to_string(),
-                    })?
+                    }
+                    .into())
                 }
             },
 
@@ -626,10 +634,11 @@ impl<'a> AccessSpec<'a> {
                                 return Err(RelocationError::InvalidAccessIndex {
                                     type_name: btf.err_type_name(ty),
                                     spec: spec.to_string(),
-                                    index: index,
+                                    index,
                                     max_index: members.len(),
                                     error: "out of bounds struct or union access".to_string(),
-                                })?;
+                                }
+                                .into());
                             }
 
                             let member = members[index];
@@ -665,7 +674,8 @@ impl<'a> AccessSpec<'a> {
                                     index,
                                     max_index: array.nelems as usize,
                                     error: "array index out of bounds".to_string(),
-                                })?;
+                                }
+                                .into());
                             }
                             accessors.push(Accessor {
                                 type_id,
@@ -682,7 +692,8 @@ impl<'a> AccessSpec<'a> {
                                 type_kind: format!("{:?}", ty.kind()),
                                 error: "field relocation on a type that doesn't have fields"
                                     .to_string(),
-                            })?;
+                            }
+                            .into());
                         }
                     };
                 }
@@ -690,9 +701,9 @@ impl<'a> AccessSpec<'a> {
                 AccessSpec {
                     btf,
                     root_type_id,
-                    relocation,
                     parts,
                     accessors,
+                    relocation,
                     bit_offset,
                 }
             }
@@ -787,7 +798,8 @@ impl ComputedRelocation {
                         relocation_number: rel.number,
                         index: ins_index,
                         error: format!("invalid src_reg={:x} expected {:x}", src_reg, BPF_K),
-                    })?;
+                    }
+                    .into());
                 }
 
                 ins.imm = target_value as i32;
@@ -798,7 +810,8 @@ impl ComputedRelocation {
                         relocation_number: rel.number,
                         index: ins_index,
                         error: format!("value `{}` overflows 16 bits offset field", target_value),
-                    })?;
+                    }
+                    .into());
                 }
 
                 ins.off = target_value as i16;
@@ -823,7 +836,8 @@ impl ComputedRelocation {
                                     err_type_name(&target_btf.err_type_name(target_ty)),
                                     self.target.size,
                                 ),
-                            })?
+                            }
+                            .into())
                         }
                     }
 
@@ -837,7 +851,8 @@ impl ComputedRelocation {
                                 relocation_number: rel.number,
                                 index: ins_index,
                                 error: format!("invalid target size {}", size),
-                            })?
+                            }
+                            .into())
                         }
                     } as u8;
                     ins.code = ins.code & 0xE0 | size | ins.code & 0x07;
@@ -860,7 +875,8 @@ impl ComputedRelocation {
                     relocation_number: rel.number,
                     index: ins_index,
                     error: format!("invalid instruction class {:x}", class),
-                })?
+                }
+                .into())
             }
         };
 
@@ -931,7 +947,8 @@ impl ComputedRelocation {
                         relocation_kind: format!("{:?}", rel_kind),
                         type_kind: format!("{:?}", ty.kind()),
                         error: "invalid relocation kind for array type".to_string(),
-                    })?;
+                    }
+                    .into());
                 }
             };
         }
@@ -947,7 +964,8 @@ impl ComputedRelocation {
                     relocation_kind: format!("{:?}", rel.kind),
                     type_kind: format!("{:?}", ty.kind()),
                     error: "field relocation on a type that doesn't have fields".to_string(),
-                })?;
+                }
+                .into());
             }
         };
 
@@ -967,7 +985,7 @@ impl ComputedRelocation {
             while bit_off + bit_size - byte_off * 8 > byte_size * 8 {
                 if byte_size >= 8 {
                     // the bitfield is larger than 8 bytes!?
-                    return Err(BtfError::InvalidTypeInfo)?;
+                    return Err(BtfError::InvalidTypeInfo.into());
                 }
                 byte_size *= 2;
                 byte_off = bit_off / 8 / byte_size * byte_size;
@@ -983,6 +1001,8 @@ impl ComputedRelocation {
             size: 0,
             type_id: None,
         };
+
+        #[allow(clippy::wildcard_in_or_patterns)]
         match rel.kind {
             FieldByteOffset => {
                 value.value = byte_off;

aya/src/obj/btf/types.rs

@@ -200,10 +200,7 @@ impl BtfType {
     }
 
     pub(crate) fn is_composite(&self) -> bool {
-        match self {
-            BtfType::Struct(_, _) | BtfType::Union(_, _) => true,
-            _ => false,
-        }
+        matches!(self, BtfType::Struct(_, _) | BtfType::Union(_, _))
     }
 }
 

aya/src/obj/mod.rs

@@ -116,7 +116,7 @@ impl FromStr for ProgramSection {
 
         // parse the common case, eg "xdp/program_name" or
         // "sk_skb/stream_verdict/program_name"
-        let mut parts = section.rsplitn(2, "/").collect::<Vec<_>>();
+        let mut parts = section.rsplitn(2, '/').collect::<Vec<_>>();
         if parts.len() == 1 {
             parts.push(parts[0]);
         }
@@ -132,7 +132,7 @@ impl FromStr for ProgramSection {
             _ if kind.starts_with("tracepoint") || kind.starts_with("tp") => {
                 // tracepoint sections are named `tracepoint/category/event_name`,
                 // and we want to parse the name as "category/event_name"
-                let name = section.splitn(2, "/").last().unwrap().to_owned();
+                let name = section.splitn(2, '/').last().unwrap().to_owned();
                 TracePoint { name }
             }
             "socket_filter" => SocketFilter { name },
@@ -155,7 +155,7 @@ impl FromStr for ProgramSection {
 
 impl Object {
     pub(crate) fn parse(data: &[u8]) -> Result<Object, BpfError> {
-        let obj = object::read::File::parse(data).map_err(|e| ParseError::ElfError(e))?;
+        let obj = object::read::File::parse(data).map_err(ParseError::ElfError)?;
         let endianness = obj.endianness();
 
         let license = if let Some(section) = obj.section_by_name("license") {
@@ -192,12 +192,12 @@ impl Object {
             bpf_obj.parse_section(Section::try_from(&s)?)?;
         }
 
-        return Ok(bpf_obj);
+        Ok(bpf_obj)
     }
 
     fn new(endianness: Endianness, license: CString, kernel_version: KernelVersion) -> Object {
         Object {
-            endianness: endianness.into(),
+            endianness,
             license,
             kernel_version,
             btf: None,
@@ -300,17 +300,16 @@ impl Object {
     }
 
     fn parse_section(&mut self, mut section: Section) -> Result<(), BpfError> {
-        let mut parts = section.name.rsplitn(2, "/").collect::<Vec<_>>();
+        let mut parts = section.name.rsplitn(2, '/').collect::<Vec<_>>();
         parts.reverse();
 
-        if parts.len() == 1 {
-            if parts[0] == "xdp"
+        if parts.len() == 1
+            && (parts[0] == "xdp"
                 || parts[0] == "sk_msg"
                 || parts[0] == "sockops"
-                || parts[0] == "classifier"
-            {
-                parts.push(parts[0]);
-            }
+                || parts[0] == "classifier")
+        {
+            parts.push(parts[0]);
         }
 
         match section.name {
@@ -322,7 +321,7 @@ impl Object {
             ".BTF" => self.parse_btf(&section)?,
             ".BTF.ext" => self.parse_btf_ext(&section)?,
             map if map.starts_with("maps/") => {
-                let name = map.splitn(2, "/").last().unwrap();
+                let name = map.splitn(2, '/').last().unwrap();
                 self.maps
                     .insert(name.to_string(), parse_map(&section, name)?);
             }
@@ -720,7 +719,7 @@ mod tests {
             pinning: 7,
         };
         let mut buf = [0u8; 128];
-        unsafe { ptr::write_unaligned(buf.as_mut_ptr() as *mut _, def.clone()) };
+        unsafe { ptr::write_unaligned(buf.as_mut_ptr() as *mut _, def) };
 
         assert_eq!(parse_map_def("foo", &buf).unwrap(), def);
     }

aya/src/obj/relocation.rs

@@ -216,9 +216,8 @@ impl<'a> FunctionLinker<'a> {
         program: &mut Function,
         fun: &Function,
     ) -> Result<usize, RelocationError> {
-        match self.linked_functions.get(&fun.address) {
-            Some(fun_ins_index) => return Ok(*fun_ins_index), // already linked
-            None => {}
+        if let Some(fun_ins_index) = self.linked_functions.get(&fun.address) {
+            return Ok(*fun_ins_index);
         };
 
         // append fun.instructions to the program and record that `fun.address` has been inserted

aya/src/programs/probe.rs

@@ -75,7 +75,7 @@ fn read_sys_fs_perf_ret_probe(pmu: &str) -> Result<u32, (String, io::Error)> {
 
     let data = fs::read_to_string(&file).map_err(|e| (file.clone(), e))?;
 
-    let mut parts = data.trim().splitn(2, ":").skip(1);
+    let mut parts = data.trim().splitn(2, ':').skip(1);
     let config = parts.next().ok_or_else(|| {
         (
             file.clone(),

aya/src/programs/socket_filter.rs

@@ -87,7 +87,7 @@ impl SocketFilter {
         if ret < 0 {
             return Err(SocketFilterError::SoAttachBpfError {
                 io_error: io::Error::last_os_error(),
-            })?;
+            }.into());
         }
 
         Ok(self.data.link(SocketFilterLink {

aya/src/programs/tc.rs

@@ -147,7 +147,7 @@ impl Drop for TcLink {
 
 impl Link for TcLink {
     fn detach(&mut self) -> Result<(), ProgramError> {
-        if let Some(_) = self.prog_fd.take() {
+        if self.prog_fd.take().is_some() {
             unsafe { netlink_qdisc_detach(self.if_index, &self.attach_type, self.priority) }
                 .map_err(|io_error| TcError::NetlinkError { io_error })?;
             Ok(())

aya/src/programs/uprobe.rs

@@ -88,7 +88,7 @@ impl UProbe {
         let target_str = &*target.as_os_str().to_string_lossy();
 
         let mut path = if let Some(pid) = pid {
-            find_lib_in_proc_maps(pid, &target_str).map_err(|io_error| UProbeError::FileError {
+            find_lib_in_proc_maps(pid, target_str).map_err(|io_error| UProbeError::FileError {
                 filename: format!("/proc/{}/maps", pid),
                 io_error,
             })?
@@ -231,10 +231,9 @@ impl LdSoCache {
 
         let mut buf = [0u8; LD_SO_CACHE_HEADER.len()];
         cursor.read_exact(&mut buf)?;
-        let header = std::str::from_utf8(&buf).or(Err(io::Error::new(
-            io::ErrorKind::InvalidData,
-            "invalid ld.so.cache header",
-        )))?;
+        let header = std::str::from_utf8(&buf).map_err(|_| {
+            io::Error::new(io::ErrorKind::InvalidData, "invalid ld.so.cache header")
+        })?;
         if header != LD_SO_CACHE_HEADER {
             return Err(io::Error::new(
                 io::ErrorKind::InvalidData,

aya/src/programs/xdp.rs

@@ -99,7 +99,7 @@ impl Xdp {
         if if_index == 0 {
             return Err(ProgramError::UnknownInterface {
                 name: interface.to_string(),
-            })?;
+            });
         }
 
         let k_ver = kernel_version().unwrap();

aya/src/sys/bpf.rs

@@ -184,7 +184,7 @@ pub(crate) fn bpf_map_update_elem_per_cpu<K, V: Pod>(
     values: &PerCpuValues<V>,
     flags: u64,
 ) -> SysResult {
-    let mut mem = values.into_kernel_mem().map_err(|e| (-1, e))?;
+    let mut mem = values.build_kernel_mem().map_err(|e| (-1, e))?;
     bpf_map_update_elem_ptr(fd, key, mem.as_mut_ptr(), flags)
 }
 
@@ -264,6 +264,6 @@ pub(crate) fn bpf_prog_detach(
     sys_bpf(bpf_cmd::BPF_PROG_DETACH, &attr)
 }
 
-fn sys_bpf<'a>(cmd: bpf_cmd, attr: &'a bpf_attr) -> SysResult {
+fn sys_bpf(cmd: bpf_cmd, attr: &bpf_attr) -> SysResult {
     syscall(Syscall::Bpf { cmd, attr })
 }

aya/src/sys/fake.rs

@@ -14,7 +14,7 @@ thread_local! {
 
 #[cfg(test)]
 unsafe fn test_syscall(_call: Syscall) -> SysResult {
-    return Err((-1, io::Error::from_raw_os_error(libc::EINVAL)));
+    Err((-1, io::Error::from_raw_os_error(libc::EINVAL)))
 }
 
 #[cfg(test)]

aya/src/sys/netlink.rs

@@ -76,7 +76,7 @@ pub(crate) unsafe fn netlink_set_xdp_fd(
         0,
     ) < 0
     {
-        return Err(io::Error::last_os_error())?;
+        return Err(io::Error::last_os_error());
     }
 
     sock.recv()?;
@@ -123,7 +123,7 @@ pub(crate) unsafe fn netlink_qdisc_add_clsact(if_index: i32) -> Result<(), io::E
         0,
     ) < 0
     {
-        return Err(io::Error::last_os_error())?;
+        return Err(io::Error::last_os_error());
     }
     sock.recv()?;
 
@@ -184,7 +184,7 @@ pub(crate) unsafe fn netlink_qdisc_attach(
         0,
     ) < 0
     {
-        return Err(io::Error::last_os_error())?;
+        return Err(io::Error::last_os_error());
     }
 
     // find the RTM_NEWTFILTER reply and read the tcm_info field which we'll
@@ -242,7 +242,7 @@ pub(crate) unsafe fn netlink_qdisc_detach(
         0,
     ) < 0
     {
-        return Err(io::Error::last_os_error())?;
+        return Err(io::Error::last_os_error());
     }
 
     sock.recv()?;
@@ -274,7 +274,7 @@ impl NetlinkSocket {
         // Safety: libc wrapper
         let sock = unsafe { socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE) };
         if sock < 0 {
-            return Err(io::Error::last_os_error())?;
+            return Err(io::Error::last_os_error());
         }
 
         let enable = 1i32;
@@ -296,7 +296,7 @@ impl NetlinkSocket {
         // Safety: libc wrapper
         if unsafe { getsockname(sock, &mut addr as *mut _ as *mut _, &mut addr_len as *mut _) } < 0
         {
-            return Err(io::Error::last_os_error())?;
+            return Err(io::Error::last_os_error());
         }
 
         Ok(NetlinkSocket {
@@ -314,7 +314,7 @@ impl NetlinkSocket {
             // Safety: libc wrapper
             let len = unsafe { recv(self.sock, buf.as_mut_ptr() as *mut _, buf.len(), 0) };
             if len < 0 {
-                return Err(io::Error::last_os_error())?;
+                return Err(io::Error::last_os_error());
             }
             if len == 0 {
                 break;

aya/src/util.rs

@@ -108,8 +108,6 @@ pub(crate) fn tc_handler_make(major: u32, minor: u32) -> u32 {
 
 #[cfg(test)]
 mod tests {
-    use std::iter::FromIterator;
-
     use super::*;
 
     #[test]
@@ -117,9 +115,18 @@ mod tests {
         assert_eq!(parse_cpu_ranges("0").unwrap(), vec![0]);
         assert_eq!(parse_cpu_ranges("0,1").unwrap(), vec![0, 1]);
         assert_eq!(parse_cpu_ranges("0,1,2").unwrap(), vec![0, 1, 2]);
-        assert_eq!(parse_cpu_ranges("0-7").unwrap(), Vec::from_iter(0..=7));
-        assert_eq!(parse_cpu_ranges("0-3,4-7").unwrap(), Vec::from_iter(0..=7));
-        assert_eq!(parse_cpu_ranges("0-5,6,7").unwrap(), Vec::from_iter(0..=7));
+        assert_eq!(
+            parse_cpu_ranges("0-7").unwrap(),
+            (0..=7).collect::<Vec<_>>()
+        );
+        assert_eq!(
+            parse_cpu_ranges("0-3,4-7").unwrap(),
+            (0..=7).collect::<Vec<_>>()
+        );
+        assert_eq!(
+            parse_cpu_ranges("0-5,6,7").unwrap(),
+            (0..=7).collect::<Vec<_>>()
+        );
         assert!(parse_cpu_ranges("").is_err());
         assert!(parse_cpu_ranges("0-1,2-").is_err());
         assert!(parse_cpu_ranges("foo").is_err());