asm-generic: add .data.rel.ro sections to __ro_after_init

maillist inclusion
commit 857ddf520d76d6516d5cdca396461141b7ca921b
category: feature
feature: ARM kaslr support
bugzilla: 47952
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git/commit/?h=arm-kaslr-latest&id=857ddf520d76d6516d5cdca396461141b7ca921b

-------------------------------------------------

When running in PIC mode, the compiler will emit const structures
containing runtime relocatable quantities into .data.rel.ro.* sections,
so that the linker can be smart about placing them together in a segment
that is read-write initially, and is remapped read-only afterwards. This
is exactly what __ro_after_init aims to provide, so move these sections
together.
Acked-by: NArnd Bergmann <arnd@arndb.de>
Acked-by: NNicolas Pitre <nico@linaro.org>
Acked-by: NKees Cook <keescook@chromium.org>
Signed-off-by: NArd Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: NCui GaoSheng <cuigaosheng1@huawei.com>
Reviewed-by: NXiu Jianfeng <xiujianfeng@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

include/asm-generic/vmlinux.lds.h

@@ -403,7 +403,7 @@
 #define RO_AFTER_INIT_DATA						\
 	. = ALIGN(8);							\
 	__start_ro_after_init = .;					\
-	*(.data..ro_after_init)						\
+	*(.data..ro_after_init .data.rel.ro.*)				\
 	JUMP_TABLE_DATA							\
 	STATIC_CALL_DATA						\
 	__end_ro_after_init = .;