openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

arm64: hibernate: Don't hibernate on systems with stuck CPUs 

Hibernate relies on cpu hotplug to prevent secondary cores executing
the kernel text while it is being restored.

Add a call to cpus_are_stuck_in_kernel() to determine if there are
CPUs not counted by 'num_online_cpus()', and prevent hibernate in this
case.

Fixes: 82869ac57b ("arm64: kernel: Add support for hibernate/suspend-to-disk")
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
James Morse 2016-06-22 10:06:13 +01:00 committed by Will Deacon
parent 5c492c3f52
commit d74b4e4f1a
1 changed files with 6 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
arch/arm64/kernel/hibernate.c
View File

@ -33,6 +33,7 @@
#include <asm/pgtable.h>
#include <asm/pgtable-hwdef.h>
#include <asm/sections.h>
#include <asm/smp.h>
#include <asm/suspend.h>
#include <asm/virt.h>
@ -236,6 +237,11 @@ int swsusp_arch_suspend(void)
unsigned long flags;
struct sleep_stack_data state;
if (cpus_are_stuck_in_kernel()) {
pr_err("Can't hibernate: no mechanism to offline secondary CPUs.\n");
return -EBUSY;
}
local_dbg_save(flags);
if (__cpu_suspend_enter(&state)) {