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-rw-r--r--mm/allocpercpu.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/mm/allocpercpu.c b/mm/allocpercpu.c
index dfdee6a4735..df34ceae0c6 100644
--- a/mm/allocpercpu.c
+++ b/mm/allocpercpu.c
@@ -5,6 +5,8 @@
*/
#include <linux/mm.h>
#include <linux/module.h>
+#include <linux/bootmem.h>
+#include <asm/sections.h>
#ifndef cache_line_size
#define cache_line_size() L1_CACHE_BYTES
@@ -147,3 +149,29 @@ void free_percpu(void *__pdata)
kfree(__percpu_disguise(__pdata));
}
EXPORT_SYMBOL_GPL(free_percpu);
+
+/*
+ * Generic percpu area setup.
+ */
+#ifndef CONFIG_HAVE_SETUP_PER_CPU_AREA
+unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
+
+EXPORT_SYMBOL(__per_cpu_offset);
+
+void __init setup_per_cpu_areas(void)
+{
+ unsigned long size, i;
+ char *ptr;
+ unsigned long nr_possible_cpus = num_possible_cpus();
+
+ /* Copy section for each CPU (we discard the original) */
+ size = ALIGN(PERCPU_ENOUGH_ROOM, PAGE_SIZE);
+ ptr = alloc_bootmem_pages(size * nr_possible_cpus);
+
+ for_each_possible_cpu(i) {
+ __per_cpu_offset[i] = ptr - __per_cpu_start;
+ memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
+ ptr += size;
+ }
+}
+#endif /* CONFIG_HAVE_SETUP_PER_CPU_AREA */