sparc32: mm: srmmu: add __ro_after_init to sparc32_cachetlb_ops structures

The objects viking_ops, viking_sun4d_smp_ops and smp_cachetlb_ops of
type sparc32_cachetlb_ops are not modified anywhere after getting modified
in the init functions. Inside init their reference is also stored in a
pointer of type const struct sparc32_cachetlb_ops *. So these structures
are never modified after init, therefore add __ro_after to the declaration
of these structures.
Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc/mm/srmmu.c

@@ -1444,7 +1444,7 @@ static void poke_viking(void)
 	srmmu_set_mmureg(mreg);
 }
 
-static struct sparc32_cachetlb_ops viking_ops = {
+static struct sparc32_cachetlb_ops viking_ops __ro_after_init = {
 	.cache_all	= viking_flush_cache_all,
 	.cache_mm	= viking_flush_cache_mm,
 	.cache_page	= viking_flush_cache_page,
@@ -1475,7 +1475,7 @@ static struct sparc32_cachetlb_ops viking_ops = {
  * flushes going at once will require SMP locking anyways so there's
  * no real value in trying any harder than this.
  */
-static struct sparc32_cachetlb_ops viking_sun4d_smp_ops = {
+static struct sparc32_cachetlb_ops viking_sun4d_smp_ops __ro_after_init = {
 	.cache_all	= viking_flush_cache_all,
 	.cache_mm	= viking_flush_cache_mm,
 	.cache_page	= viking_flush_cache_page,
@@ -1759,7 +1759,7 @@ static void smp_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr)
 	local_ops->sig_insns(mm, insn_addr);
 }
 
-static struct sparc32_cachetlb_ops smp_cachetlb_ops = {
+static struct sparc32_cachetlb_ops smp_cachetlb_ops __ro_after_init = {
 	.cache_all	= smp_flush_cache_all,
 	.cache_mm	= smp_flush_cache_mm,
 	.cache_page	= smp_flush_cache_page,