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powerpc/numa: remove ability to enable topology updates

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Remove the /proc/powerpc/topology_updates interface and the
topology_updates=on/off command line argument. The internal
topology_updates_enabled flag remains for now, but always false.

Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Reviewed-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200612051238.1007764-4-nathanl@linux.ibm.com
This commit is contained in:
Nathan Lynch 2020-06-12 00:12:23 -05:00 committed by Michael Ellerman
parent ec2fc2a9e9
commit c30f931e89
1 changed files with 1 additions and 70 deletions
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71
arch/powerpc/mm/numa.c
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@ -984,27 +984,7 @@ static int __init early_numa(char *p)
}
early_param("numa", early_numa);
/*
* The platform can inform us through one of several mechanisms
* (post-migration device tree updates, PRRN or VPHN) that the NUMA
* assignment of a resource has changed. This controls whether we act
* on that. Disabled by default.
*/
static bool topology_updates_enabled;
static int __init early_topology_updates(char *p)
{
if (!p)
return 0;
if (!strcmp(p, "on")) {
pr_warn("Caution: enabling topology updates\n");
topology_updates_enabled = true;
}
return 0;
}
early_param("topology_updates", early_topology_updates);
static const bool topology_updates_enabled;
#ifdef CONFIG_MEMORY_HOTPLUG
/*
@ -1632,52 +1612,6 @@ int prrn_is_enabled(void)
return prrn_enabled;
}
static int topology_read(struct seq_file *file, void *v)
{
if (vphn_enabled || prrn_enabled)
seq_puts(file, "on\n");
else
seq_puts(file, "off\n");
return 0;
}
static int topology_open(struct inode *inode, struct file *file)
{
return single_open(file, topology_read, NULL);
}
static ssize_t topology_write(struct file *file, const char __user *buf,
size_t count, loff_t *off)
{
char kbuf[4]; /* "on" or "off" plus null. */
int read_len;
read_len = count < 3 ? count : 3;
if (copy_from_user(kbuf, buf, read_len))
return -EINVAL;
kbuf[read_len] = '\0';
if (!strncmp(kbuf, "on", 2)) {
topology_updates_enabled = true;
start_topology_update();
} else if (!strncmp(kbuf, "off", 3)) {
stop_topology_update();
topology_updates_enabled = false;
} else
return -EINVAL;
return count;
}
static const struct proc_ops topology_proc_ops = {
.proc_read = seq_read,
.proc_write = topology_write,
.proc_open = topology_open,
.proc_release = single_release,
};
static int topology_update_init(void)
{
start_topology_update();
@ -1685,9 +1619,6 @@ static int topology_update_init(void)
if (vphn_enabled)
topology_schedule_update();
if (!proc_create("powerpc/topology_updates", 0644, NULL, &topology_proc_ops))
return -ENOMEM;
topology_inited = 1;
return 0;
}