linux-kernel - [PATCH 1/2] Add new macros for page-aligned data and bss sections.

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Message-Id: <1245801576-13374-1-git-send-email-tabbott@ksplice.com>
Date:	Tue, 23 Jun 2009 19:59:35 -0400
From:	Tim Abbott <tabbott@...lice.com>
To:	Linux kernel mailing list <linux-kernel@...r.kernel.org>
Cc:	Sam Ravnborg <sam@...nborg.org>, devel@...lice.com,
	Denys Vlasenko <vda.linux@...glemail.com>,
	Tim Abbott <tabbott@...lice.com>
Subject: [PATCH 1/2] Add new macros for page-aligned data and bss sections.

This patch is preparation for replacing most uses of
".bss.page_aligned" and ".data.page_aligned" in the kernel with
macros, so that the section name can later be changed without having
to touch a lot of the kernel.

The long-term goal here is to be able to change the kernel's magic
section names to those that are compatible with -ffunction-sections
-fdata-sections.  This requires renaming all magic sections with names
of the form ".data.foo".

Signed-off-by: Tim Abbott <tabbott@...lice.com>
Cc: Sam Ravnborg <sam@...nborg.org>
Acked-by: David Howells <dhowells@...hat.com>
---
 include/linux/linkage.h |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/include/linux/linkage.h b/include/linux/linkage.h
index fee9e59..691f591 100644
--- a/include/linux/linkage.h
+++ b/include/linux/linkage.h
@@ -22,6 +22,15 @@
 #define __page_aligned_bss	__section(.bss.page_aligned) __aligned(PAGE_SIZE)
 
 /*
+ * For assembly routines.
+ *
+ * Note when using these that you must specify the appropriate
+ * alignment directives yourself
+ */
+#define __PAGE_ALIGNED_DATA	.section ".data.page_aligned", "aw"
+#define __PAGE_ALIGNED_BSS	.section ".bss.page_aligned", "aw"
+
+/*
  * This is used by architectures to keep arguments on the stack
  * untouched by the compiler by keeping them live until the end.
  * The argument stack may be owned by the assembly-language
-- 
1.6.3.1

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