access_process_vm device memory infrastructure

[pandora-kernel.git] / include / asm-x86 / percpu.h

diff --git a/include/asm-x86/percpu.h b/include/asm-x86/percpu.h
index 912a3a1..4e91ee1 100644 (file)
--- a/include/asm-x86/percpu.h
+++ b/include/asm-x86/percpu.h
@@ -22,6 +22,32 @@
 
 DECLARE_PER_CPU(struct x8664_pda, pda);
 
+/*
+ * These are supposed to be implemented as a single instruction which
+ * operates on the per-cpu data base segment.  x86-64 doesn't have
+ * that yet, so this is a fairly inefficient workaround for the
+ * meantime.  The single instruction is atomic with respect to
+ * preemption and interrupts, so we need to explicitly disable
+ * interrupts here to achieve the same effect.  However, because it
+ * can be used from within interrupt-disable/enable, we can't actually
+ * disable interrupts; disabling preemption is enough.
+ */
+#define x86_read_percpu(var)                                           \
+       ({                                                              \
+               typeof(per_cpu_var(var)) __tmp;                         \
+               preempt_disable();                                      \
+               __tmp = __get_cpu_var(var);                             \
+               preempt_enable();                                       \
+               __tmp;                                                  \
+       })
+
+#define x86_write_percpu(var, val)                                     \
+       do {                                                            \
+               preempt_disable();                                      \
+               __get_cpu_var(var) = (val);                             \
+               preempt_enable();                                       \
+       } while(0)
+
 #else /* CONFIG_X86_64 */
 
 #ifdef __ASSEMBLY__