linux-kernel - [PATCH 3/8] powerpc: Use macros for .data.page

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Date:	Thu, 30 Apr 2009 19:56:12 -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>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>, linuxppc-dev@...abs.org,
	Tim Abbott <tabbott@....EDU>
Subject: [PATCH 3/8] powerpc: Use macros for .data.page_aligned section.

.data.page_aligned should not need a separate output section, so as
part of this cleanup I moved into the .data output section in the
linker scripts in order to eliminate unnecessary references to the
section name.

Note that this change moves the page-aligned data inside _edata.
Since it _is_ data, I suspect having page-aligned data outside _edata
was a bug.  Please comment if it is not.

Signed-off-by: Tim Abbott <tabbott@....edu>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: linuxppc-dev@...abs.org
---
 arch/powerpc/kernel/vdso.c                  |    3 ++-
 arch/powerpc/kernel/vdso32/vdso32_wrapper.S |    3 ++-
 arch/powerpc/kernel/vdso64/vdso64_wrapper.S |    3 ++-
 arch/powerpc/kernel/vmlinux.lds.S           |    6 +-----
 4 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/arch/powerpc/kernel/vdso.c b/arch/powerpc/kernel/vdso.c
index ad06d5c..f075591 100644
--- a/arch/powerpc/kernel/vdso.c
+++ b/arch/powerpc/kernel/vdso.c
@@ -1,3 +1,4 @@
+
 /*
  *    Copyright (C) 2004 Benjamin Herrenschmidt, IBM Corp.
  *			 <benh@...nel.crashing.org>
@@ -74,7 +75,7 @@ static int vdso_ready;
 static union {
 	struct vdso_data	data;
 	u8			page[PAGE_SIZE];
-} vdso_data_store __attribute__((__section__(".data.page_aligned")));
+} vdso_data_store __page_aligned_data;
 struct vdso_data *vdso_data = &vdso_data_store.data;
 
 /* Format of the patch table */
diff --git a/arch/powerpc/kernel/vdso32/vdso32_wrapper.S b/arch/powerpc/kernel/vdso32/vdso32_wrapper.S
index 556f0ca..6e8f507 100644
--- a/arch/powerpc/kernel/vdso32/vdso32_wrapper.S
+++ b/arch/powerpc/kernel/vdso32/vdso32_wrapper.S
@@ -1,7 +1,8 @@
 #include <linux/init.h>
+#include <linux/linkage.h>
 #include <asm/page.h>
 
-	.section ".data.page_aligned"
+	__PAGE_ALIGNED_DATA
 
 	.globl vdso32_start, vdso32_end
 	.balign PAGE_SIZE
diff --git a/arch/powerpc/kernel/vdso64/vdso64_wrapper.S b/arch/powerpc/kernel/vdso64/vdso64_wrapper.S
index 0529cb9..b8553d6 100644
--- a/arch/powerpc/kernel/vdso64/vdso64_wrapper.S
+++ b/arch/powerpc/kernel/vdso64/vdso64_wrapper.S
@@ -1,7 +1,8 @@
 #include <linux/init.h>
+#include <linux/linkage.h>
 #include <asm/page.h>
 
-	.section ".data.page_aligned"
+	__PAGE_ALIGNED_DATA
 
 	.globl vdso64_start, vdso64_end
 	.balign PAGE_SIZE
diff --git a/arch/powerpc/kernel/vmlinux.lds.S b/arch/powerpc/kernel/vmlinux.lds.S
index 47899b0..d3dcea0 100644
--- a/arch/powerpc/kernel/vmlinux.lds.S
+++ b/arch/powerpc/kernel/vmlinux.lds.S
@@ -221,6 +221,7 @@ SECTIONS
 	_sdata = .;
 
 	.data : AT(ADDR(.data) - LOAD_OFFSET) {
+		PAGE_ALIGNED_DATA
 		DATA_DATA
 #ifdef CONFIG_PPC32
 		*(.sdata)
@@ -258,11 +259,6 @@ SECTIONS
 		*(.data.init_task)
 	}
 
-	. = ALIGN(PAGE_SIZE);
-	.data.page_aligned : AT(ADDR(.data.page_aligned) - LOAD_OFFSET) {
-		*(.data.page_aligned)
-	}
-
 	.data.cacheline_aligned : AT(ADDR(.data.cacheline_aligned) - LOAD_OFFSET) {
 		*(.data.cacheline_aligned)
 	}
-- 
1.6.2.1

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