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authorTejun Heo <tj@kernel.org>2010-12-18 16:28:55 +0100
committerTejun Heo <tj@kernel.org>2010-12-30 12:20:28 +0100
commit0a3aee0da4402aa19b66e458038533c896fb80c6 (patch)
treeb2c29c0b18218b76cc0e7ed9866a2c12d1e22e3a /arch/x86/kernel/hw_breakpoint.c
parent7c83912062c801738d7d19acaf8f7fec25ea663c (diff)
x86: Use this_cpu_ops to optimize code
Go through x86 code and replace __get_cpu_var and get_cpu_var instances that refer to a scalar and are not used for address determinations. Cc: Yinghai Lu <yinghai@kernel.org> Cc: Ingo Molnar <mingo@elte.hu> Acked-by: Tejun Heo <tj@kernel.org> Acked-by: "H. Peter Anvin" <hpa@zytor.com> Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'arch/x86/kernel/hw_breakpoint.c')
-rw-r--r--arch/x86/kernel/hw_breakpoint.c12
1 files changed, 6 insertions, 6 deletions
diff --git a/arch/x86/kernel/hw_breakpoint.c b/arch/x86/kernel/hw_breakpoint.c
index 42c59425450..02f07634d26 100644
--- a/arch/x86/kernel/hw_breakpoint.c
+++ b/arch/x86/kernel/hw_breakpoint.c
@@ -122,7 +122,7 @@ int arch_install_hw_breakpoint(struct perf_event *bp)
return -EBUSY;
set_debugreg(info->address, i);
- __get_cpu_var(cpu_debugreg[i]) = info->address;
+ __this_cpu_write(cpu_debugreg[i], info->address);
dr7 = &__get_cpu_var(cpu_dr7);
*dr7 |= encode_dr7(i, info->len, info->type);
@@ -397,12 +397,12 @@ void flush_ptrace_hw_breakpoint(struct task_struct *tsk)
void hw_breakpoint_restore(void)
{
- set_debugreg(__get_cpu_var(cpu_debugreg[0]), 0);
- set_debugreg(__get_cpu_var(cpu_debugreg[1]), 1);
- set_debugreg(__get_cpu_var(cpu_debugreg[2]), 2);
- set_debugreg(__get_cpu_var(cpu_debugreg[3]), 3);
+ set_debugreg(__this_cpu_read(cpu_debugreg[0]), 0);
+ set_debugreg(__this_cpu_read(cpu_debugreg[1]), 1);
+ set_debugreg(__this_cpu_read(cpu_debugreg[2]), 2);
+ set_debugreg(__this_cpu_read(cpu_debugreg[3]), 3);
set_debugreg(current->thread.debugreg6, 6);
- set_debugreg(__get_cpu_var(cpu_dr7), 7);
+ set_debugreg(__this_cpu_read(cpu_dr7), 7);
}
EXPORT_SYMBOL_GPL(hw_breakpoint_restore);