From: Tim Abbott <tabbott@MIT•EDU>
To: Sam Ravnborg <sam@ravnborg•org>
Cc: linux-mips@linux-mips•org, linux-m68k@vger•kernel.org,
linux-ia64@vger•kernel.org, linux-sh@vger•kernel.org,
Denys Vlasenko <vda.linux@googlemail•com>,
Greg Ungerer <gerg@uclinux•org>, Jeff Arnold <jbarnold@mit•edu>,
linuxppc-dev@ozlabs•org, Paul Mackerras <paulus@samba•org>,
"H. Peter Anvin" <hpa@zytor•com>,
sparclinux@vger•kernel.org, Sam Ravnborg <sam@ravnborg•org>,
Waseem Daher <wdaher@mit•edu>,
linux-arm-kernel@lists•arm.linux.org.uk,
linux-s390@vger•kernel.org,
Jesper Nilsson <jesper.nilsson@axis•com>,
linux-am33-list@redhat•com,
Yoshinori Sato <ysato@users•sourceforge.jp>,
Helge Deller <deller@gmx•de>, Ingo Molnar <mingo@redhat•com>,
Geert Uytterhoeven <geert@linux-m68k•org>,
microblaze-uclinux@itee•uq.edu.au,
Russell King <rmk+kernel@arm•linux.org.uk>,
user-mode-linux-devel@lists•sourceforge.net,
Heiko Carstens <heiko.carstens@de•ibm.com>,
Jeff Dike <jdike@addtoit•com>,
dev-etrax@axis•com, Mikael Starvik <starvik@axis•com>,
Tony Luck <tony.luck@intel•com>, Tim Abbott <tabbott@mit•edu>,
Cyrill Gorcunov <gorcunov@openvz•org>,
Michal Simek <monstr@monstr•eu>,
Richard Henderson <rth@twiddle•net>,
Chris Zankel <chris@zankel•net>, Bryan Wu <cooloney@kernel•org>,
linux-m32r@ml•linux-m32r.org, linux-parisc@vger•kernel.org,
Haavard Skinnemoen <hskinnemoen@atmel•com>,
Hirokazu Takata <takata@linux-m32r•org>,
Ralf Baechle <ralf@linux-mips•org>,
Anders Kaseorg <andersk@mit•edu>,
Kyle McMartin <kyle@mcmartin•ca>,
Paul Mundt <lethal@linux-sh•org>,
Thomas Gleixner <tglx@linutronix•de>,
linux-alpha@vger•kernel.org,
Martin Schwidefsky <schwidefsky@de•ibm.com>,
uclinux-dist-devel@blackfin•uclinux.org,
Linus Torvalds <torvalds@linux-foundation•org>,
"David S. Miller" <davem@davemloft•net>
Subject: [PATCH 1/6] Add new macros for page-aligned data and bss sections.
Date: Thu, 30 Apr 2009 15:32:31 -0400 [thread overview]
Message-ID: <1241119956-31453-2-git-send-email-tabbott@mit.edu> (raw)
In-Reply-To: <1241119956-31453-1-git-send-email-tabbott@mit.edu>
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@mit•edu>
Cc: Sam Ravnborg <sam@ravnborg•org>
Acked-by: David Howells <dhowells@redhat•com>
---
include/asm-generic/vmlinux.lds.h | 8 ++++++++
include/linux/linkage.h | 9 +++++++++
2 files changed, 17 insertions(+), 0 deletions(-)
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index 89853bc..3d88c87 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -116,6 +116,14 @@
FTRACE_EVENTS() \
TRACE_SYSCALLS()
+#define PAGE_ALIGNED_DATA \
+ . = ALIGN(PAGE_SIZE); \
+ *(.data.page_aligned)
+
+#define PAGE_ALIGNED_BSS \
+ . = ALIGN(PAGE_SIZE); \
+ *(.bss.page_aligned)
+
#define RO_DATA(align) \
. = ALIGN((align)); \
.rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \
diff --git a/include/linux/linkage.h b/include/linux/linkage.h
index fee9e59..af051fc 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", @progbits
+#define __PAGE_ALIGNED_BSS .section ".bss.page_aligned", "aw", @nobits
+
+/*
* 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
--
1.6.2.1
next prev parent reply other threads:[~2009-04-30 19:40 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-30 19:32 [PATCH 0/6] macros for section name cleanup Tim Abbott
2009-04-30 19:32 ` Tim Abbott [this message]
2009-04-30 19:32 ` [PATCH 2/6] Add new NOSAVE_DATA linker script macro Tim Abbott
2009-04-30 19:32 ` [PATCH 3/6] Add new CACHELINE_ALIGNED_DATA " Tim Abbott
2009-04-30 19:32 ` [PATCH 4/6] Add new INIT_TASK_DATA() " Tim Abbott
2009-04-30 19:32 ` [PATCH 5/6] Add new READ_MOSTLY_DATA(align) " Tim Abbott
2009-04-30 19:32 ` [PATCH 6/6] Add support for __read_mostly to linux/cache.h Tim Abbott
2009-05-01 9:44 ` Sam Ravnborg
2009-05-01 13:52 ` Christoph Lameter
2009-05-01 21:47 ` [microblaze-uclinux] " Edgar E. Iglesias
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