1 files changed, 84 insertions, 0 deletions

diff --git a/include/linux/percpu-defs.h b/include/linux/percpu-defs.h
new file mode 100644
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+++ b/include/linux/percpu-defs.h
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+#ifndef _LINUX_PERCPU_DEFS_H
+#define _LINUX_PERCPU_DEFS_H
+
+/*
+ * Determine the real variable name from the name visible in the
+ * kernel sources.
+ */
+#define per_cpu_var(var) per_cpu__##var
+
+/*
+ * Base implementations of per-CPU variable declarations and definitions, where
+ * the section in which the variable is to be placed is provided by the
+ * 'section' argument.  This may be used to affect the parameters governing the
+ * variable's storage.
+ *
+ * NOTE!  The sections for the DECLARE and for the DEFINE must match, lest
+ * linkage errors occur due the compiler generating the wrong code to access
+ * that section.
+ */
+#define DECLARE_PER_CPU_SECTION(type, name, section)                    \
+        extern                                                          \
+        __attribute__((__section__(PER_CPU_BASE_SECTION section)))      \
+        PER_CPU_ATTRIBUTES __typeof__(type) per_cpu__##name
+
+#define DEFINE_PER_CPU_SECTION(type, name, section)                     \
+        __attribute__((__section__(PER_CPU_BASE_SECTION section)))      \
+        PER_CPU_ATTRIBUTES __typeof__(type) per_cpu__##name
+
+/*
+ * Variant on the per-CPU variable declaration/definition theme used for
+ * ordinary per-CPU variables.
+ */
+#define DECLARE_PER_CPU(type, name)                                     \
+        DECLARE_PER_CPU_SECTION(type, name, "")
+
+#define DEFINE_PER_CPU(type, name)                                      \
+        DEFINE_PER_CPU_SECTION(type, name, "")
+
+/*
+ * Declaration/definition used for per-CPU variables that must come first in
+ * the set of variables.
+ */
+#define DECLARE_PER_CPU_FIRST(type, name)                               \
+        DECLARE_PER_CPU_SECTION(type, name, PER_CPU_FIRST_SECTION)
+
+#define DEFINE_PER_CPU_FIRST(type, name)                                \
+        DEFINE_PER_CPU_SECTION(type, name, PER_CPU_FIRST_SECTION)
+
+/*
+ * Declaration/definition used for per-CPU variables that must be cacheline
+ * aligned under SMP conditions so that, whilst a particular instance of the
+ * data corresponds to a particular CPU, inefficiencies due to direct access by
+ * other CPUs are reduced by preventing the data from unnecessarily spanning
+ * cachelines.
+ *
+ * An example of this would be statistical data, where each CPU's set of data
+ * is updated by that CPU alone, but the data from across all CPUs is collated
+ * by a CPU processing a read from a proc file.
+ */
+#define DECLARE_PER_CPU_SHARED_ALIGNED(type, name)                      \
+        DECLARE_PER_CPU_SECTION(type, name, PER_CPU_SHARED_ALIGNED_SECTION) \
+        ____cacheline_aligned_in_smp
+
+#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name)                       \
+        DEFINE_PER_CPU_SECTION(type, name, PER_CPU_SHARED_ALIGNED_SECTION) \
+        ____cacheline_aligned_in_smp
+
+/*
+ * Declaration/definition used for per-CPU variables that must be page aligned.
+ */
+#define DECLARE_PER_CPU_PAGE_ALIGNED(type, name)                                \
+        DECLARE_PER_CPU_SECTION(type, name, ".page_aligned")
+
+#define DEFINE_PER_CPU_PAGE_ALIGNED(type, name)                         \
+        DEFINE_PER_CPU_SECTION(type, name, ".page_aligned")
+
+/*
+ * Intermodule exports for per-CPU variables.
+ */
+#define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
+#define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
+
+
+#endif /* _LINUX_PERCPU_DEFS_H */