misc: Further improve imports styling

By introducing `imports_granularity="Module"` format strategy,
effectively groups imports from the same module into one line or block,
improving maintainability and readability.

Signed-off-by: Ruoqing He <heruoqing@iscas.ac.cn>

devices/src/gic.rs

@@ -9,10 +9,8 @@ use std::sync::{Arc, Mutex};
 
 use anyhow::anyhow;
 use arch::layout;
-use hypervisor::{
-    arch::aarch64::gic::{Vgic, VgicConfig},
-    CpuState, GicState,
-};
+use hypervisor::arch::aarch64::gic::{Vgic, VgicConfig};
+use hypervisor::{CpuState, GicState};
 use vm_device::interrupt::{
     InterruptIndex, InterruptManager, InterruptSourceConfig, InterruptSourceGroup,
     LegacyIrqSourceConfig, MsiIrqGroupConfig,

devices/src/interrupt_controller.rs

@@ -2,8 +2,7 @@
 //
 // SPDX-License-Identifier: Apache-2.0 AND BSD-3-Clause
 
-use std::io;
-use std::result;
+use std::{io, result};
 
 use thiserror::Error;
 use vmm_sys_util::eventfd::EventFd;

devices/src/legacy/cmos.rs

@@ -5,10 +5,9 @@
 // SPDX-License-Identifier: Apache-2.0 AND BSD-3-Clause
 
 use std::cmp::min;
-use std::mem;
 use std::sync::atomic::{AtomicBool, Ordering};
 use std::sync::{Arc, Barrier};
-use std::thread;
+use std::{mem, thread};
 
 // https://github.com/rust-lang/libc/issues/1848
 #[cfg_attr(target_env = "musl", allow(deprecated))]

devices/src/legacy/gpio_pl061.rs

@@ -7,9 +7,8 @@
 //! This module implements an ARM PrimeCell General Purpose Input/Output(PL061) to support gracefully poweroff microvm from external.
 //!
 
-use std::io;
-use std::result;
 use std::sync::{Arc, Barrier};
+use std::{io, result};
 
 use serde::{Deserialize, Serialize};
 use thiserror::Error;

devices/src/legacy/i8042.rs

@@ -4,10 +4,8 @@
 //
 // SPDX-License-Identifier: Apache-2.0 AND BSD-3-Clause
 
-use std::sync::{
-    atomic::{AtomicBool, Ordering},
-    Arc, Barrier,
-};
+use std::sync::atomic::{AtomicBool, Ordering};
+use std::sync::{Arc, Barrier};
 use std::thread;
 
 use vm_device::BusDevice;

devices/src/pvmemcontrol.rs

@@ -3,12 +3,10 @@
 // SPDX-License-Identifier: Apache-2.0
 //
 
-use std::{
-    collections::HashMap,
-    ffi::CString,
-    io, result,
-    sync::{Arc, Barrier, Mutex, RwLock},
-};
+use std::collections::HashMap;
+use std::ffi::CString;
+use std::sync::{Arc, Barrier, Mutex, RwLock};
+use std::{io, result};
 
 use num_enum::TryFromPrimitive;
 use pci::{
@@ -16,11 +14,13 @@ use pci::{
     PciClassCode, PciConfiguration, PciDevice, PciDeviceError, PciHeaderType, PciSubclass,
 };
 use thiserror::Error;
-use vm_allocator::{page_size::get_page_size, AddressAllocator, SystemAllocator};
+use vm_allocator::page_size::get_page_size;
+use vm_allocator::{AddressAllocator, SystemAllocator};
 use vm_device::{BusDeviceSync, Resource};
+use vm_memory::bitmap::AtomicBitmap;
 use vm_memory::{
-    bitmap::AtomicBitmap, Address, ByteValued, Bytes, GuestAddress, GuestAddressSpace, GuestMemory,
-    GuestMemoryAtomic, GuestMemoryError, GuestMemoryMmap, Le32, Le64,
+    Address, ByteValued, Bytes, GuestAddress, GuestAddressSpace, GuestMemory, GuestMemoryAtomic,
+    GuestMemoryError, GuestMemoryMmap, Le32, Le64,
 };
 use vm_migration::{Migratable, MigratableError, Pausable, Snapshot, Snapshottable, Transportable};