[PATCH] variable overflow after hundreds round of hotplug CPU
I'm doing the cpu hotplug stress test and found a variable ('ready') is
overflow after several hundreds rounds of cpu hotplug. Here is a fix.
Signed-off-by: Shaohua Li<shaohua.li@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/arch/i386/kernel/head.S b/arch/i386/kernel/head.S
index e966fc8c..4477bb1 100644
--- a/arch/i386/kernel/head.S
+++ b/arch/i386/kernel/head.S
@@ -299,7 +299,6 @@
movl %eax,%cr0
call check_x87
- incb ready
lgdt cpu_gdt_descr
lidt idt_descr
ljmp $(__KERNEL_CS),$1f
@@ -316,8 +315,9 @@
lldt %ax
cld # gcc2 wants the direction flag cleared at all times
#ifdef CONFIG_SMP
- movb ready, %cl
- cmpb $1,%cl
+ movb ready, %cl
+ movb $1, ready
+ cmpb $0,%cl
je 1f # the first CPU calls start_kernel
# all other CPUs call initialize_secondary
call initialize_secondary
