um: Remove /proc/sysemu support code

Currently /proc/sysemu will never be registered, as sysemu_supported
is initialized to zero implicitly and no code updates it. And there is
also nothing to configure via sysemu in UML anymore.

Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com>
Link: https://patch.msgid.link/20240527134024.1539848-3-tiwei.btw@antgroup.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/arch/um/kernel/process.c b/arch/um/kernel/process.c
index d2134802f6a83c37ebd5b85ca4b51ed6ac639085..79f41f06a98fbb4c6aa0f873c82a8eaf9537afc1 100644 (file)
--- a/arch/um/kernel/process.c
+++ b/arch/um/kernel/process.c
@@ -237,73 +237,6 @@ int copy_from_user_proc(void *to, void __user *from, int size)
        return copy_from_user(to, from, size);
 }
 
-static atomic_t using_sysemu = ATOMIC_INIT(0);
-int sysemu_supported;
-
-static void set_using_sysemu(int value)
-{
-       if (value > sysemu_supported)
-               return;
-       atomic_set(&using_sysemu, value);
-}
-
-static int get_using_sysemu(void)
-{
-       return atomic_read(&using_sysemu);
-}
-
-static int sysemu_proc_show(struct seq_file *m, void *v)
-{
-       seq_printf(m, "%d\n", get_using_sysemu());
-       return 0;
-}
-
-static int sysemu_proc_open(struct inode *inode, struct file *file)
-{
-       return single_open(file, sysemu_proc_show, NULL);
-}
-
-static ssize_t sysemu_proc_write(struct file *file, const char __user *buf,
-                                size_t count, loff_t *pos)
-{
-       char tmp[2];
-
-       if (copy_from_user(tmp, buf, 1))
-               return -EFAULT;
-
-       if (tmp[0] >= '0' && tmp[0] <= '2')
-               set_using_sysemu(tmp[0] - '0');
-       /* We use the first char, but pretend to write everything */
-       return count;
-}
-
-static const struct proc_ops sysemu_proc_ops = {
-       .proc_open      = sysemu_proc_open,
-       .proc_read      = seq_read,
-       .proc_lseek     = seq_lseek,
-       .proc_release   = single_release,
-       .proc_write     = sysemu_proc_write,
-};
-
-static int __init make_proc_sysemu(void)
-{
-       struct proc_dir_entry *ent;
-       if (!sysemu_supported)
-               return 0;
-
-       ent = proc_create("sysemu", 0600, NULL, &sysemu_proc_ops);
-
-       if (ent == NULL)
-       {
-               printk(KERN_WARNING "Failed to register /proc/sysemu\n");
-               return 0;
-       }
-
-       return 0;
-}
-
-late_initcall(make_proc_sysemu);
-
 int singlestepping(void)
 {
        return test_thread_flag(TIF_SINGLESTEP);