GitHub-Mirror/Star64_linux
2
0
Fork 0
mirror of https://github.com/Fishwaldo/Star64_linux.git synced 2025-06-27 00:51:35 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

[PATCH] Disable CPU hotplug during suspend

Browse source 
The current suspend code has to be run on one CPU, so we use the CPU
hotplug to take the non-boot CPUs offline on SMP machines.  However, we
should also make sure that these CPUs will not be enabled by someone else
after we have disabled them.

The functions disable_nonboot_cpus() and enable_nonboot_cpus() are moved to
kernel/cpu.c, because they now refer to some stuff in there that should
better be static.  Also it's better if disable_nonboot_cpus() returns an
error instead of panicking if something goes wrong, and
enable_nonboot_cpus() has no reason to panic(), because the CPUs may have
been enabled by the userland before it tries to take them online.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Rafael J. Wysocki 2006-09-25 23:32:48 -07:00 • committed by Linus Torvalds
parent e8eff5ac29
commit e3920fb42c
8 changed files with 146 additions and 105 deletions
Download patch file Download diff file Expand all files Collapse all files

14
kernel/power/user.c
View file

@ -19,6 +19,7 @@
#include <linux/swapops.h>
#include <linux/pm.h>
#include <linux/fs.h>
#include <linux/cpu.h>
#include <asm/uaccess.h>
@ -139,12 +140,15 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp,
if (data->frozen)
break;
down(&pm_sem);
disable_nonboot_cpus();
if (freeze_processes()) {
thaw_processes();
enable_nonboot_cpus();
error = -EBUSY;
error = disable_nonboot_cpus();
if (!error) {
error = freeze_processes();
if (error) {
thaw_processes();
error = -EBUSY;
}
}
enable_nonboot_cpus();
up(&pm_sem);
if (!error)
data->frozen = 1;