ARM: vmlinux.lds.S: replace open coded .data sections with generic macros

Our .data section is missing PAGE_ALIGNED_DATA() which contains,
amongst other things, the vdso page. This creates a System.map that
looks like this:

c15769a8 D _edata
c1577000 d vdso_data_store
c1578000 D __start___bug_table
c1580544 D __stop___bug_table
c1580544 B __bss_start

By using RW_DATA_SECTION() we pick whatever generic sections might be
added in the future and have page-aligned data next to other strongly
aligned data. Furthermore we now include the entire thing, including the
bug table, in the data accounting surrounded by _sdata/_edata.

While at it let's also remplace the open coded .init.data by its
equivalent INIT_DATA_SECTION().

Signed-off-by: Nicolas Pitre <nico@linaro.org>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Tested-by: Chris Brandt <Chris.Brandt@renesas.com>

arch/arm/kernel/vmlinux.lds.S

@@ -214,14 +214,9 @@ SECTIONS
 		*(.pv_table)
 		__pv_table_end = .;
 	}
-	.init.data : {
-		INIT_DATA
-		INIT_SETUP(16)
-		INIT_CALLS
-		CON_INITCALL
-		SECURITY_INITCALL
-		INIT_RAM_FS
-	}
+
+	INIT_DATA_SECTION(16)
+
 	.exit.data : {
 		ARM_EXIT_KEEP(EXIT_DATA)
 	}
@@ -237,30 +232,9 @@ SECTIONS
 #endif
 	__init_end = .;
 
-	.data : {
-		_data = .;		/* address in memory */
-		_sdata = .;
-
-		/*
-		 * first, the init task union, aligned
-		 * to an 8192 byte boundary.
-		 */
-		INIT_TASK_DATA(THREAD_SIZE)
-
-		NOSAVE_DATA
-		CACHELINE_ALIGNED_DATA(L1_CACHE_BYTES)
-		READ_MOSTLY_DATA(L1_CACHE_BYTES)
-
-		/*
-		 * and the usual data section
-		 */
-		DATA_DATA
-		CONSTRUCTORS
-
-		_edata = .;
-	}
-
-	BUG_TABLE
+	_sdata = .;
+	RW_DATA_SECTION(L1_CACHE_BYTES, PAGE_SIZE, THREAD_SIZE)
+	_edata = .;
 
 #ifdef CONFIG_HAVE_TCM
         /*