Blackfin arch: SMP supporting patchset: Blackfin kernel and memory management code

Blackfin dual core BF561 processor can support SMP like features.
https://docs.blackfin.uclinux.org/doku.php?id=linux-kernel:smp-like

In this patch, we provide SMP extend to Blackfin kernel and memory management code

Singed-off-by: Graf Yang <graf.yang@analog.com>
Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

1 files changed, 11 insertions, 2 deletions

diff --git a/arch/blackfin/kernel/module.c b/arch/blackfin/kernel/module.c
index e1bebc80a5bf..2e14cadd4302 100644
--- a/arch/blackfin/kernel/module.c
+++ b/arch/blackfin/kernel/module.c
@@ -343,7 +343,13 @@ apply_relocate_add(Elf_Shdr * sechdrs, const char *strtab,
                 pr_debug("location is %x, value is %x type is %d \n",
                          (unsigned int) location32, value,
                          ELF32_R_TYPE(rel[i].r_info));
-
+#ifdef CONFIG_SMP
+                if ((unsigned long)location16 >= COREB_L1_DATA_A_START) {
+                        printk(KERN_ERR "module %s: cannot relocate in L1: %u (SMP kernel)",
+                                       mod->name, ELF32_R_TYPE(rel[i].r_info));
+                        return -ENOEXEC;
+                }
+#endif
                 switch (ELF32_R_TYPE(rel[i].r_info)) {
 
                 case R_pcrel24:
@@ -436,6 +442,7 @@ module_finalize(const Elf_Ehdr * hdr,
 {
         unsigned int i, strindex = 0, symindex = 0;
         char *secstrings;
+        long err = 0;
 
         secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
 
@@ -460,8 +467,10 @@ module_finalize(const Elf_Ehdr * hdr,
                     (strcmp(".rela.l1.text", secstrings + sechdrs[i].sh_name) == 0) ||
                     ((strcmp(".rela.text", secstrings + sechdrs[i].sh_name) == 0) &&
                         (hdr->e_flags & (EF_BFIN_CODE_IN_L1|EF_BFIN_CODE_IN_L2))))) {
-                        apply_relocate_add((Elf_Shdr *) sechdrs, strtab,
+                        err = apply_relocate_add((Elf_Shdr *) sechdrs, strtab,
                                            symindex, i, mod);
+                        if (err < 0)
+                                return -ENOEXEC;
                 }
         }
         return 0;