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proc: make struct proc_dir_entry::namelen unsigned int 

1. namelen is declared "unsigned short" which hints for "maybe space savings".
   Indeed in 2.4 struct proc_dir_entry looked like:

        struct proc_dir_entry {
                unsigned short low_ino;
                unsigned short namelen;

   Now, low_ino is "unsigned int", all savings were gone for a long time.
   "struct proc_dir_entry" is not that countless to worry about it's size,
   anyway.

2. converting from unsigned short to int/unsigned int can only create
   problems, we better play it safe.

Space is not really conserved, because of natural alignment for the next
field.  sizeof(struct proc_dir_entry) remains the same.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alexey Dobriyan 2011-03-23 16:42:52 -07:00 committed by Linus Torvalds
parent fc3d8767b2
commit 312ec7e50c
2 changed files with 5 additions and 5 deletions
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8
fs/proc/generic.c
View File

@ -28,7 +28,7 @@
DEFINE_SPINLOCK(proc_subdir_lock);
static int proc_match(int len, const char *name, struct proc_dir_entry *de)
static int proc_match(unsigned int len, const char *name, struct proc_dir_entry *de)
{
if (de->namelen != len)
return 0;
@ -303,7 +303,7 @@ static int __xlate_proc_name(const char *name, struct proc_dir_entry **ret,
{
const char *cp = name, *next;
struct proc_dir_entry *de;
int len;
unsigned int len;
de = *ret;
if (!de)
@ -602,7 +602,7 @@ static struct proc_dir_entry *__proc_create(struct proc_dir_entry **parent,
{
struct proc_dir_entry *ent = NULL;
const char *fn = name;
int len;
unsigned int len;
/* make sure name is valid */
if (!name || !strlen(name)) goto out;
@ -786,7 +786,7 @@ void remove_proc_entry(const char *name, struct proc_dir_entry *parent)
struct proc_dir_entry **p;
struct proc_dir_entry *de = NULL;
const char *fn = name;
int len;
unsigned int len;
spin_lock(&proc_subdir_lock);
if (__xlate_proc_name(name, &parent, &fn) != 0) {

2
include/linux/proc_fs.h
View File

@ -50,7 +50,7 @@ typedef int (write_proc_t)(struct file *file, const char __user *buffer,
struct proc_dir_entry {
unsigned int low_ino;
unsigned short namelen;
unsigned int namelen;
const char *name;
mode_t mode;
nlink_t nlink;