1 files changed, 51 insertions, 4 deletions

diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index c61fab1dd2f8..5406e70aba86 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -430,12 +430,59 @@
         *(.initcall7.init)                                              \
         *(.initcall7s.init)
 
+/**
+ * PERCPU_VADDR - define output section for percpu area
+ * @vaddr: explicit base address (optional)
+ * @phdr: destination PHDR (optional)
+ *
+ * Macro which expands to output section for percpu area.  If @vaddr
+ * is not blank, it specifies explicit base address and all percpu
+ * symbols will be offset from the given address.  If blank, @vaddr
+ * always equals @laddr + LOAD_OFFSET.
+ *
+ * @phdr defines the output PHDR to use if not blank.  Be warned that
+ * output PHDR is sticky.  If @phdr is specified, the next output
+ * section in the linker script will go there too.  @phdr should have
+ * a leading colon.
+ *
+ * Note that this macros defines __per_cpu_load as an absolute symbol.
+ * If there is no need to put the percpu section at a predetermined
+ * address, use PERCPU().
+ */
+#define PERCPU_VADDR(vaddr, phdr)                                       \
+        VMLINUX_SYMBOL(__per_cpu_load) = .;                             \
+        .data.percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load)          \
+                                - LOAD_OFFSET) {                        \
+                VMLINUX_SYMBOL(__per_cpu_start) = .;                    \
+                *(.data.percpu.first)                                   \
+                *(.data.percpu.page_aligned)                            \
+                *(.data.percpu)                                         \
+                *(.data.percpu.shared_aligned)                          \
+                VMLINUX_SYMBOL(__per_cpu_end) = .;                      \
+        } phdr                                                          \
+        . = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data.percpu);
+
+/**
+ * PERCPU - define output section for percpu area, simple version
+ * @align: required alignment
+ *
+ * Align to @align and outputs output section for percpu area.  This
+ * macro doesn't maniuplate @vaddr or @phdr and __per_cpu_load and
+ * __per_cpu_start will be identical.
+ *
+ * This macro is equivalent to ALIGN(align); PERCPU_VADDR( , ) except
+ * that __per_cpu_load is defined as a relative symbol against
+ * .data.percpu which is required for relocatable x86_32
+ * configuration.
+ */
 #define PERCPU(align)                                                   \
         . = ALIGN(align);                                               \
-        VMLINUX_SYMBOL(__per_cpu_start) = .;                            \
-        .data.percpu  : AT(ADDR(.data.percpu) - LOAD_OFFSET) {          \
+        .data.percpu    : AT(ADDR(.data.percpu) - LOAD_OFFSET) {        \
+                VMLINUX_SYMBOL(__per_cpu_load) = .;                     \
+                VMLINUX_SYMBOL(__per_cpu_start) = .;                    \
+                *(.data.percpu.first)                                   \
                 *(.data.percpu.page_aligned)                            \
                 *(.data.percpu)                                         \
                 *(.data.percpu.shared_aligned)                          \
-        }                                                               \
-        VMLINUX_SYMBOL(__per_cpu_end) = .;
+                VMLINUX_SYMBOL(__per_cpu_end) = .;                      \
+        }