I think this patch already exists in one form or another in some x86 tree.
Signed-off-by: Christoph Lameter <cl@xxxxxxxxx>
Index: linux/arch/x86/include/asm/debugreg.h
===================================================================
--- linux.orig/arch/x86/include/asm/debugreg.h 2013-08-06 13:52:23.740092873 -0500
+++ linux/arch/x86/include/asm/debugreg.h 2013-08-06 13:52:23.740092873 -0500
@@ -97,11 +97,11 @@ extern void hw_breakpoint_restore(void);
DECLARE_PER_CPU(int, debug_stack_usage);
static inline void debug_stack_usage_inc(void)
{
- __get_cpu_var(debug_stack_usage)++;
+ __this_cpu_inc(debug_stack_usage);
}
static inline void debug_stack_usage_dec(void)
{
- __get_cpu_var(debug_stack_usage)--;
+ __this_cpu_dec(debug_stack_usage);
}
int is_debug_stack(unsigned long addr);
void debug_stack_set_zero(void);
Index: linux/arch/x86/kernel/cpu/common.c
===================================================================
--- linux.orig/arch/x86/kernel/cpu/common.c 2013-07-19 09:06:36.850047837 -0500
+++ linux/arch/x86/kernel/cpu/common.c 2013-08-06 13:54:36.426384889 -0500
@@ -1144,9 +1144,9 @@ DEFINE_PER_CPU(int, debug_stack_usage);
int is_debug_stack(unsigned long addr)
{
- return __get_cpu_var(debug_stack_usage) ||
- (addr <= __get_cpu_var(debug_stack_addr) &&
- addr > (__get_cpu_var(debug_stack_addr) - DEBUG_STKSZ));
+ return __this_cpu_read(debug_stack_usage) ||
+ (addr <= __this_cpu_read(debug_stack_addr) &&
+ addr > (__this_cpu_read(debug_stack_addr) - DEBUG_STKSZ));
}
DEFINE_PER_CPU(u32, debug_idt_ctr);
--
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