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[Xen-devel] [PATCH v5 1/6] xen: Add convenient macro boot_cpu

The macro boot_cpu will be used to get CPU variable from the boot CPU.

Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx>
Suggested-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Keir Fraser <keir@xxxxxxx>
 xen/include/xen/percpu.h |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/xen/include/xen/percpu.h b/xen/include/xen/percpu.h
index abe0b11..0e848bf 100644
--- a/xen/include/xen/percpu.h
+++ b/xen/include/xen/percpu.h
@@ -16,6 +16,9 @@
 /* Preferred on Xen. Also see arch-defined per_cpu(). */
 #define this_cpu(var)    __get_cpu_var(var)
+/* Access variable on boot CPU */
+#define boot_cpu(var)   per_cpu(var, 0)
 /* Linux compatibility. */
 #define get_cpu_var(var) this_cpu(var)
 #define put_cpu_var(var)

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