linux-kernel - [PATCH 06/11] x86: use NOSAVE_DATA macro for .data.nosave section.

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Message-Id: <1241136098-10376-7-git-send-email-tabbott@mit.edu>
Date:	Thu, 30 Apr 2009 20:01:33 -0400
From:	Tim Abbott <tabbott@....EDU>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	Linux kernel mailing list <linux-kernel@...r.kernel.org>,
	Anders Kaseorg <andersk@....edu>,
	Waseem Daher <wdaher@....edu>,
	Denys Vlasenko <vda.linux@...glemail.com>,
	Jeff Arnold <jbarnold@....edu>, Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, Tim Abbott <tabbott@....edu>
Subject: [PATCH 06/11] x86: use NOSAVE_DATA macro for .data.nosave section.

.data.nosave should not need a separate output section; this change
moves it into the .data section.

On x86_64, this has the consequence of moving .data.nosave inside
_edata, which I think should be harmless.

Signed-off-by: Tim Abbott <tabbott@....edu>
Cc: Ingo Molnar <mingo@...hat.com>
---
 arch/x86/kernel/vmlinux.lds.S |   29 ++++++-----------------------
 1 files changed, 6 insertions(+), 23 deletions(-)

diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
index 791afa7..88b059b 100644
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -103,6 +103,7 @@ SECTIONS
 	. = ALIGN(PAGE_SIZE);
 	.data : AT(ADDR(.data) - LOAD_OFFSET) {
 		PAGE_ALIGNED_DATA
+		NOSAVE_DATA
 		DATA_DATA
 		CONSTRUCTORS
 
@@ -113,17 +114,6 @@ SECTIONS
 	} :data
 
 #ifdef CONFIG_X86_32
-	/* 32 bit has nosave before _edata */
-	. = ALIGN(PAGE_SIZE);
-	.data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) {
-		__nosave_begin = .;
-		*(.data.nosave)
-		. = ALIGN(PAGE_SIZE);
-		__nosave_end = .;
-	}
-#endif
-
-#ifdef CONFIG_X86_32
 	. = ALIGN(32);
 #else
 	. = ALIGN(PAGE_SIZE);
@@ -323,7 +313,7 @@ SECTIONS
 #if defined(CONFIG_X86_64) && defined(CONFIG_SMP)
 	/*
 	 * percpu offsets are zero-based on SMP.  PERCPU_VADDR() changes the
-	 * output PHDR, so the next output section - __data_nosave - should
+	 * output PHDR, so the next output section - .bss - should
 	 * start another section data.init2.  Also, pda should be at the head of
 	 * percpu area.  Preallocate it and define the percpu offset symbol
 	 * so that it can be accessed as a percpu variable.
@@ -341,17 +331,6 @@ SECTIONS
 		__init_end = .;
 	}
 
-#ifdef CONFIG_X86_64
-	.data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) {
-		. = ALIGN(PAGE_SIZE);
-		__nosave_begin = .;
-		*(.data.nosave)
-		. = ALIGN(PAGE_SIZE);
-		__nosave_end = .;
-	} :data.init2
-	/* use another section data.init2, see PERCPU_VADDR() above */
-#endif
-
 	/* BSS */
 	. = ALIGN(PAGE_SIZE);
 	.bss : AT(ADDR(.bss) - LOAD_OFFSET) {
@@ -361,6 +340,10 @@ SECTIONS
 		. = ALIGN(4);
 		__bss_stop = .;
 	}
+#ifdef CONFIG_X86_64
+	 :data.init2
+#endif
+	/* use another section data.init2, see PERCPU_VADDR() above */
 
 	. = ALIGN(PAGE_SIZE);
 	.brk : AT(ADDR(.brk) - LOAD_OFFSET) {
-- 
1.6.2.1

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