From e1d9fd2e3d33b2fec3207171ec8ca6e71d5c81c7 Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Sat, 23 Dec 2006 16:55:29 +0100 Subject: [PATCH] [PATCH] suspend: fix suspend on single-CPU systems Clark Williams reported that suspend doesnt work on his laptop on 2.6.20-rc1-rt kernels. The bug was introduced by the following cleanup commit: commit 112cecb2cc0e7341db92281ba04b26c41bb8146d Author: Siddha, Suresh B Date: Wed Dec 6 20:34:31 2006 -0800 [PATCH] suspend: don't change cpus_allowed for task initiating the suspend because with this change 'error' is not initialized to 0 anymore, if there are no other online CPUs. (i.e. if the system is single-CPU). the fix is the initialize it to 0. The really weird thing is that my version of gcc does not warn about this non-initialized variable situation ... (also fix the kernel printk in the error branch, it was missing a newline) Reported-by: Clark Williams Signed-off-by: Ingo Molnar Signed-off-by: Linus Torvalds --- kernel/cpu.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/cpu.c b/kernel/cpu.c index 9124669f4586..241064a32241 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -258,7 +258,7 @@ static cpumask_t frozen_cpus; int disable_nonboot_cpus(void) { - int cpu, first_cpu, error; + int cpu, first_cpu, error = 0; mutex_lock(&cpu_add_remove_lock); first_cpu = first_cpu(cpu_present_map); @@ -294,7 +294,7 @@ int disable_nonboot_cpus(void) /* Make sure the CPUs won't be enabled by someone else */ cpu_hotplug_disabled = 1; } else { - printk(KERN_ERR "Non-boot CPUs are not disabled"); + printk(KERN_ERR "Non-boot CPUs are not disabled\n"); } out: mutex_unlock(&cpu_add_remove_lock);