1 files changed, 44 insertions, 6 deletions

diff --git a/arch/x86/tools/relocs.c b/arch/x86/tools/relocs.c
index f7bab68a4b83..cfbdbdb4e173 100644
--- a/arch/x86/tools/relocs.c
+++ b/arch/x86/tools/relocs.c
@@ -722,15 +722,25 @@ static void percpu_init(void)
 
 /*
  * Check to see if a symbol lies in the .data..percpu section.
- * For some as yet not understood reason the "__init_begin"
- * symbol which immediately preceeds the .data..percpu section
- * also shows up as it it were part of it so we do an explict
- * check for that symbol name and ignore it.
+ *
+ * The linker incorrectly associates some symbols with the
+ * .data..percpu section so we also need to check the symbol
+ * name to make sure that we classify the symbol correctly.
+ *
+ * The GNU linker incorrectly associates:
+ *      __init_begin
+ *      __per_cpu_load
+ *
+ * The "gold" linker incorrectly associates:
+ *      init_per_cpu__irq_stack_union
+ *      init_per_cpu__gdt_page
  */
 static int is_percpu_sym(ElfW(Sym) *sym, const char *symname)
 {
         return (sym->st_shndx == per_cpu_shndx) &&
-                strcmp(symname, "__init_begin");
+                strcmp(symname, "__init_begin") &&
+                strcmp(symname, "__per_cpu_load") &&
+                strncmp(symname, "init_per_cpu_", 13);
 }
 
 
@@ -1015,6 +1025,29 @@ static void emit_relocs(int as_text, int use_real_mode)
         }
 }
 
+/*
+ * As an aid to debugging problems with different linkers
+ * print summary information about the relocs.
+ * Since different linkers tend to emit the sections in
+ * different orders we use the section names in the output.
+ */
+static int do_reloc_info(struct section *sec, Elf_Rel *rel, ElfW(Sym) *sym,
+                                const char *symname)
+{
+        printf("%s\t%s\t%s\t%s\n",
+                sec_name(sec->shdr.sh_info),
+                rel_type(ELF_R_TYPE(rel->r_info)),
+                symname,
+                sec_name(sym->st_shndx));
+        return 0;
+}
+
+static void print_reloc_info(void)
+{
+        printf("reloc section\treloc type\tsymbol\tsymbol section\n");
+        walk_relocs(do_reloc_info);
+}
+
 #if ELF_BITS == 64
 # define process process_64
 #else
@@ -1022,7 +1055,8 @@ static void emit_relocs(int as_text, int use_real_mode)
 #endif
 
 void process(FILE *fp, int use_real_mode, int as_text,
-             int show_absolute_syms, int show_absolute_relocs)
+             int show_absolute_syms, int show_absolute_relocs,
+             int show_reloc_info)
 {
         regex_init(use_real_mode);
         read_ehdr(fp);
@@ -1040,5 +1074,9 @@ void process(FILE *fp, int use_real_mode, int as_text,
                 print_absolute_relocs();
                 return;
         }
+        if (show_reloc_info) {
+                print_reloc_info();
+                return;
+        }
         emit_relocs(as_text, use_real_mode);
 }