Commit cb275943 authored by Tiwei Bie's avatar Tiwei Bie Committed by Johannes Berg
Browse files

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: default avatarTiwei Bie <tiwei.btw@antgroup.com>
Link: https://patch.msgid.link/20240527134024.1539848-3-tiwei.btw@antgroup.com


Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 6fdae1da

arch/um/kernel/process.c

+0 −67
Original line number Diff line number Diff line
@@ -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);