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um: Remove /proc/sysemu support code

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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>
This commit is contained in:
Tiwei Bie 2024-05-27 21:40:24 +08:00 committed by Johannes Berg
parent 6fdae1da76
commit cb2759431a
1 changed files with 0 additions and 67 deletions
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67
arch/um/kernel/process.c
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@ -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);