Re: [PATCH] linux++: delete some forward declarations

[Steven Rostedt]

On Thu, 13 Jun 2024 22:22:18 +0300
Alexey Dobriyan <adobriyan@xxxxxxxxx> wrote:

> g++ doesn't like forward enum declarations:
> 
> 	error: use of enum ‘E’ without previous declaration
> 	   64 | enum E;

But we don't care about g++. Do we?

I would make that a separate patch.

> 
> Delete those which aren't used.
> 
> Delete some unused/unnecessary forward struct declarations for a change.

This is a clean up, but should have a better change log. Just something
simple like:

  Delete unnecessary forward struct declarations.

Thanks,

-- Steve


> 
> Signed-off-by: Alexey Dobriyan <adobriyan@xxxxxxxxx>
> ---
> 
>  fs/ramfs/inode.c         |    1 -
>  include/linux/console.h  |    2 --
>  include/linux/device.h   |    3 ---
>  include/linux/ftrace.h   |    4 ----
>  include/linux/security.h |    6 ------
>  include/linux/signal.h   |    2 --
>  include/linux/syscalls.h |    7 -------
>  include/linux/sysfs.h    |    2 --
>  mm/internal.h            |    4 ----
>  mm/shmem.c               |    1 -
>  10 files changed, 32 deletions(-)
> 
> --- a/fs/ramfs/inode.c
> +++ b/fs/ramfs/inode.c
> @@ -51,7 +51,6 @@ struct ramfs_fs_info {
>  
>  #define RAMFS_DEFAULT_MODE	0755
>  
> -static const struct super_operations ramfs_ops;
>  static const struct inode_operations ramfs_dir_inode_operations;
>  
>  struct inode *ramfs_get_inode(struct super_block *sb,
> --- a/include/linux/console.h
> +++ b/include/linux/console.h
> @@ -21,10 +21,8 @@
>  #include <linux/vesa.h>
>  
>  struct vc_data;
> -struct console_font_op;
>  struct console_font;
>  struct module;
> -struct tty_struct;
>  struct notifier_block;
>  
>  enum con_scroll {
> --- a/include/linux/device.h
> +++ b/include/linux/device.h
> @@ -36,10 +36,7 @@
>  struct device;
>  struct device_private;
>  struct device_driver;
> -struct driver_private;
>  struct module;
> -struct class;
> -struct subsys_private;
>  struct device_node;
>  struct fwnode_handle;
>  struct iommu_group;
> --- a/include/linux/ftrace.h
> +++ b/include/linux/ftrace.h
> @@ -531,8 +531,6 @@ extern const void *ftrace_expected;
>  
>  void ftrace_bug(int err, struct dyn_ftrace *rec);
>  
> -struct seq_file;
> -
>  extern int ftrace_text_reserved(const void *start, const void *end);
>  
>  struct ftrace_ops *ftrace_ops_trampoline(unsigned long addr);
> @@ -1147,8 +1145,6 @@ static inline void unpause_graph_tracing(void) { }
>  #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
>  
>  #ifdef CONFIG_TRACING
> -enum ftrace_dump_mode;
> -
>  #define MAX_TRACER_SIZE		100
>  extern char ftrace_dump_on_oops[];
>  extern int ftrace_dump_on_oops_enabled(void);
> --- a/include/linux/security.h
> +++ b/include/linux/security.h
> @@ -41,7 +41,6 @@ struct rlimit;
>  struct kernel_siginfo;
>  struct sembuf;
>  struct kern_ipc_perm;
> -struct audit_context;
>  struct super_block;
>  struct inode;
>  struct dentry;
> @@ -59,8 +58,6 @@ struct xfrm_sec_ctx;
>  struct mm_struct;
>  struct fs_context;
>  struct fs_parameter;
> -enum fs_value_type;
> -struct watch;
>  struct watch_notification;
>  struct lsm_ctx;
>  
> @@ -183,8 +180,6 @@ struct sock;
>  struct sockaddr;
>  struct socket;
>  struct flowi_common;
> -struct dst_entry;
> -struct xfrm_selector;
>  struct xfrm_policy;
>  struct xfrm_state;
>  struct xfrm_user_sec_ctx;
> @@ -219,7 +214,6 @@ extern unsigned long dac_mmap_min_addr;
>  #define LSM_PRLIMIT_WRITE 2
>  
>  /* forward declares to avoid warnings */
> -struct sched_param;
>  struct request_sock;
>  
>  /* bprm->unsafe reasons */
> --- a/include/linux/signal.h
> +++ b/include/linux/signal.h
> @@ -274,8 +274,6 @@ static inline int valid_signal(unsigned long sig)
>  	return sig <= _NSIG ? 1 : 0;
>  }
>  
> -struct timespec;
> -struct pt_regs;
>  enum pid_type;
>  
>  extern int next_signal(struct sigpending *pending, sigset_t *mask);
> --- a/include/linux/syscalls.h
> +++ b/include/linux/syscalls.h
> @@ -11,8 +11,6 @@
>  
>  struct __aio_sigset;
>  struct epoll_event;
> -struct iattr;
> -struct inode;
>  struct iocb;
>  struct io_event;
>  struct iovec;
> @@ -20,14 +18,12 @@ struct __kernel_old_itimerval;
>  struct kexec_segment;
>  struct linux_dirent;
>  struct linux_dirent64;
> -struct list_head;
>  struct mmap_arg_struct;
>  struct msgbuf;
>  struct user_msghdr;
>  struct mmsghdr;
>  struct msqid_ds;
>  struct new_utsname;
> -struct nfsctl_arg;
>  struct __old_kernel_stat;
>  struct oldold_utsname;
>  struct old_utsname;
> @@ -38,7 +34,6 @@ struct rusage;
>  struct sched_param;
>  struct sched_attr;
>  struct sel_arg_struct;
> -struct semaphore;
>  struct sembuf;
>  struct shmid_ds;
>  struct sockaddr;
> @@ -48,14 +43,12 @@ struct statfs;
>  struct statfs64;
>  struct statx;
>  struct sysinfo;
> -struct timespec;
>  struct __kernel_old_timeval;
>  struct __kernel_timex;
>  struct timezone;
>  struct tms;
>  struct utimbuf;
>  struct mq_attr;
> -struct compat_stat;
>  struct old_timeval32;
>  struct robust_list_head;
>  struct futex_waitv;
> --- a/include/linux/sysfs.h
> +++ b/include/linux/sysfs.h
> @@ -23,9 +23,7 @@
>  #include <linux/atomic.h>
>  
>  struct kobject;
> -struct module;
>  struct bin_attribute;
> -enum kobj_ns_type;
>  
>  struct attribute {
>  	const char		*name;
> --- a/mm/internal.h
> +++ b/mm/internal.h
> @@ -1095,10 +1095,6 @@ unsigned int reclaim_clean_pages_from_list(struct zone *zone,
>  /* Flags that allow allocations below the min watermark. */
>  #define ALLOC_RESERVES (ALLOC_NON_BLOCK|ALLOC_MIN_RESERVE|ALLOC_HIGHATOMIC|ALLOC_OOM)
>  
> -enum ttu_flags;
> -struct tlbflush_unmap_batch;
> -
> -
>  /*
>   * only for MM internal work items which do not depend on
>   * any allocations or locks which might depend on allocations
> --- a/mm/shmem.c
> +++ b/mm/shmem.c
> @@ -261,7 +261,6 @@ static const struct inode_operations shmem_dir_inode_operations;
>  static const struct inode_operations shmem_special_inode_operations;
>  static const struct vm_operations_struct shmem_vm_ops;
>  static const struct vm_operations_struct shmem_anon_vm_ops;
> -static struct file_system_type shmem_fs_type;
>  
>  bool shmem_mapping(struct address_space *mapping)
>  {