ARM: vmlinux.lds: move init sections between text and data sections

Place the init sections between the text and data sections. This means all code is grouped together at the beginning of the kernel image, and all data is at the end of the image. This avoids problems with the 24-bit branch instruction relocations becoming invalid with large initramfs images. Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org> Tested-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
mariux64 · Jul 7, 2011 · 3835d69 · 3835d69
1 parent 43fc9d2
commit 3835d69
Show file tree

Hide file tree

Showing 2 changed files with 50 additions and 50 deletions.
diff --git a/arch/arm/kernel/vmlinux.lds.S b/arch/arm/kernel/vmlinux.lds.S
@@ -69,6 +69,53 @@ SECTIONS
 		_stext = .;
 		HEAD_TEXT
 	}
+	.text : {			/* Real text segment		*/
+		_text = .;		/* Text and read-only data	*/
+			__exception_text_start = .;
+			*(.exception.text)
+			__exception_text_end = .;
+			IRQENTRY_TEXT
+			TEXT_TEXT
+			SCHED_TEXT
+			LOCK_TEXT
+			KPROBES_TEXT
+#ifdef CONFIG_MMU
+			*(.fixup)
+#endif
+			*(.gnu.warning)
+			*(.glue_7)
+			*(.glue_7t)
+		. = ALIGN(4);
+		*(.got)			/* Global offset table		*/
+			ARM_CPU_KEEP(PROC_INFO)
+	}
+
+	RO_DATA(PAGE_SIZE)
+
+#ifdef CONFIG_ARM_UNWIND
+	/*
+	 * Stack unwinding tables
+	 */
+	. = ALIGN(8);
+	.ARM.unwind_idx : {
+		__start_unwind_idx = .;
+		*(.ARM.exidx*)
+		__stop_unwind_idx = .;
+	}
+	.ARM.unwind_tab : {
+		__start_unwind_tab = .;
+		*(.ARM.extab*)
+		__stop_unwind_tab = .;
+	}
+#endif
+
+	_etext = .;			/* End of text and rodata section */
+
+#ifndef CONFIG_XIP_KERNEL
+	. = ALIGN(PAGE_SIZE);
+	__init_begin = .;
+#endif
+
 	INIT_TEXT_SECTION(8)
 	.exit.text : {
 		ARM_EXIT_KEEP(EXIT_TEXT)
@@ -116,58 +163,11 @@ SECTIONS
 
 	PERCPU_SECTION(32)
 
-#ifndef CONFIG_XIP_KERNEL
-	__init_begin = _stext;
-	. = ALIGN(PAGE_SIZE);
-	__init_end = .;
-#endif
-
-	.text : {			/* Real text segment		*/
-		_text = .;		/* Text and read-only data	*/
-			__exception_text_start = .;
-			*(.exception.text)
-			__exception_text_end = .;
-			IRQENTRY_TEXT
-			TEXT_TEXT
-			SCHED_TEXT
-			LOCK_TEXT
-			KPROBES_TEXT
-#ifdef CONFIG_MMU
-			*(.fixup)
-#endif
-			*(.gnu.warning)
-			*(.glue_7)
-			*(.glue_7t)
-		. = ALIGN(4);
-		*(.got)			/* Global offset table		*/
-			ARM_CPU_KEEP(PROC_INFO)
-	}
-
-	RO_DATA(PAGE_SIZE)
-
-#ifdef CONFIG_ARM_UNWIND
-	/*
-	 * Stack unwinding tables
-	 */
-	. = ALIGN(8);
-	.ARM.unwind_idx : {
-		__start_unwind_idx = .;
-		*(.ARM.exidx*)
-		__stop_unwind_idx = .;
-	}
-	.ARM.unwind_tab : {
-		__start_unwind_tab = .;
-		*(.ARM.extab*)
-		__stop_unwind_tab = .;
-	}
-#endif
-
-	_etext = .;			/* End of text and rodata section */
-
 #ifdef CONFIG_XIP_KERNEL
 	__data_loc = ALIGN(4);		/* location in binary */
 	. = PAGE_OFFSET + TEXT_OFFSET;
 #else
+	__init_end = .;
 	. = ALIGN(THREAD_SIZE);
 	__data_loc = .;
 #endif

diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
@@ -639,8 +639,8 @@ void __init mem_init(void)
 			"    pkmap   : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 #endif
 			"    modules : 0x%08lx - 0x%08lx   (%4ld MB)\n"
-			"      .init : 0x%p" " - 0x%p" "   (%4d kB)\n"
 			"      .text : 0x%p" " - 0x%p" "   (%4d kB)\n"
+			"      .init : 0x%p" " - 0x%p" "   (%4d kB)\n"
 			"      .data : 0x%p" " - 0x%p" "   (%4d kB)\n"
 			"       .bss : 0x%p" " - 0x%p" "   (%4d kB)\n",
 
@@ -662,8 +662,8 @@ void __init mem_init(void)
 #endif
 			MLM(MODULES_VADDR, MODULES_END),
 
-			MLK_ROUNDUP(__init_begin, __init_end),
 			MLK_ROUNDUP(_text, _etext),
+			MLK_ROUNDUP(__init_begin, __init_end),
 			MLK_ROUNDUP(_sdata, _edata),
 			MLK_ROUNDUP(__bss_start, __bss_stop));