2 files changed, 25 insertions, 0 deletions

diff --git a/scripts/kallsyms.c b/scripts/kallsyms.c
index 3df15f5e7c55..1237dd7fb4ca 100644
--- a/scripts/kallsyms.c
+++ b/scripts/kallsyms.c
@@ -51,9 +51,14 @@ static struct addr_range text_ranges[] = {
 #define text_range_text     (&text_ranges[0])
 #define text_range_inittext (&text_ranges[1])
 
+static struct addr_range percpu_range = {
+        "__per_cpu_start", "__per_cpu_end", -1ULL, 0
+};
+
 static struct sym_entry *table;
 static unsigned int table_size, table_cnt;
 static int all_symbols = 0;
+static int absolute_percpu = 0;
 static char symbol_prefix_char = '\0';
 static unsigned long long kernel_start_addr = 0;
 
@@ -166,6 +171,9 @@ static int read_symbol(FILE *in, struct sym_entry *s)
         strcpy((char *)s->sym + 1, str);
         s->sym[0] = stype;
 
+        /* Record if we've found __per_cpu_start/end. */
+        check_symbol_range(sym, s->addr, &percpu_range, 1);
+
         return 0;
 }
 
@@ -657,6 +665,15 @@ static void sort_symbols(void)
         qsort(table, table_cnt, sizeof(struct sym_entry), compare_symbols);
 }
 
+static void make_percpus_absolute(void)
+{
+        unsigned int i;
+
+        for (i = 0; i < table_cnt; i++)
+                if (symbol_in_range(&table[i], &percpu_range, 1))
+                        table[i].sym[0] = 'A';
+}
+
 int main(int argc, char **argv)
 {
         if (argc >= 2) {
@@ -664,6 +681,8 @@ int main(int argc, char **argv)
                 for (i = 1; i < argc; i++) {
                         if(strcmp(argv[i], "--all-symbols") == 0)
                                 all_symbols = 1;
+                        else if (strcmp(argv[i], "--absolute-percpu") == 0)
+                                absolute_percpu = 1;
                         else if (strncmp(argv[i], "--symbol-prefix=", 16) == 0) {
                                 char *p = &argv[i][16];
                                 /* skip quote */
@@ -680,6 +699,8 @@ int main(int argc, char **argv)
                 usage();
 
         read_map(stdin);
+        if (absolute_percpu)
+                make_percpus_absolute();
         sort_symbols();
         optimize_token_table();
         write_src();
diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
index 2dcb37736d84..86a4fe75f453 100644
--- a/scripts/link-vmlinux.sh
+++ b/scripts/link-vmlinux.sh
@@ -86,6 +86,10 @@ kallsyms()
                 kallsymopt="${kallsymopt} --page-offset=$CONFIG_PAGE_OFFSET"
         fi
 
+        if [ -n "${CONFIG_X86_64}" ]; then
+                kallsymopt="${kallsymopt} --absolute-percpu"
+        fi
+
         local aflags="${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL}               \
                       ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}"