From: "H. Peter Anvin" <hpa@zytor.com>
To: Sam Ravnborg <sam@ravnborg.org>
Cc: Tim Abbott <tabbott@MIT.EDU>,
Linux kernel mailing list <linux-kernel@vger.kernel.org>,
Anders Kaseorg <andersk@MIT.EDU>, Waseem Daher <wdaher@MIT.EDU>,
Denys Vlasenko <vda.linux@googlemail.com>,
Jeff Arnold <jbarnold@MIT.EDU>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Bryan Wu <cooloney@kernel.org>, Chris Zankel <chris@zankel.net>,
Cyrill Gorcunov <gorcunov@openvz.org>,
David Howells <dhowells@redhat.com>,
"David S. Miller" <davem@davemloft.net>,
dev-etrax@axis.com, Geert Uytterhoeven <geert@linux-m68k.org>,
Greg Ungerer <gerg@uclinux.org>,
Haavard Skinnemoen <hskinnemoen@atmel.com>,
Heiko Carstens <heiko.carstens@de.ibm.com>,
Helge Deller <deller@gmx.de>,
Hirokazu Takata <takata@linux-m32r.org>,
Ingo Molnar <mingo@redhat.com>, Jeff Dike <jdike@addtoit.com>,
Jesper Nilsson <jesper.nilsson@axis.com>,
Kyle McMartin <kyle@mcmartin.ca>,
Linus Torvalds <torvalds@linux-foundation.org>,
linux-alpha@vger.kernel.org, linux-ia64@vger.kernel.org,
linux-m68k@vger.kernel.org, linux-mips@linux-mips.org,
linux-parisc@vger.kernel.org, linuxppc-dev@ozlabs.org,
linux-s390@vger.kernel.org, linux-sh@vger.kernel.org,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
Michal Simek <monstr@monstr.eu>,
microblaze-uclinux@itee.uq.edu.au,
Mikael Starvik <starvik@axis.com>,
Paul Mackerras <paulus@samba.org>,
Paul Mundt <lethal@linux-sh.org>,
Ralf Baechle <ralf@linux-mips.org>,
Richard Henderson <rth@twiddle.net>,
Roman Zippel <zippel@linux-m68k.org>,
Russell King <rmk+kernel@arm.linux.org.uk>,
sparclinux@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>,
Tony Luck <tony.luck@intel.com>,
uclinux-dist-devel@blackfin.uclinux.org,
user-mode-linux-devel@lists.sourceforge.net,
Yoshinori Sato <ysato@users.sourceforge.jp>
Subject: Re: [PATCH v2 1/6] Add new macros for page-aligned data and bss sections.
Date: Fri, 01 May 2009 10:18:20 -0700 [thread overview]
Message-ID: <49FB2EDC.9050300@zytor.com> (raw)
In-Reply-To: <20090501171717.GA26401@uranus.ravnborg.org>
Sam Ravnborg wrote:
> On Fri, May 01, 2009 at 09:33:13AM -0700, H. Peter Anvin wrote:
>> Tim Abbott wrote:
>>> On Fri, 1 May 2009, Sam Ravnborg wrote:
>>>
>>>> On Thu, Apr 30, 2009 at 03:54:08PM -0400, Tim Abbott wrote:
>>>>> +#define __PAGE_ALIGNED_DATA .section ".data.page_aligned", "aw", @progbits
>>>>> +#define __PAGE_ALIGNED_BSS .section ".bss.page_aligned", "aw", @nobits
>>>> It is my understanding that the linker will automatically
>>>> assume nobits for section names starting with .bss and likewise
>>>> progbits for section names starting with .data - so we can leave them out?
>>> I believe that is correct.
>>>
>> ... but that doesn't mean it's the right thing to do.
>>
>> It's better to be fully explicit when macroizing this kind of stuff.
>> This is part of why macroizing it is good: it means we end up with *one*
>> place that determines this stuff, not some magic heuristics in the linker.
>
> Do you know if we can use % in place of @?
> I could see that gas supports both - at least in trunk in cvs.
>
I think it might depend on the architecture(!)... but it would
definitely have to be an issue with testing a bunch of different versions.
What's wrong with @?
-hpa
--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.
next prev parent reply other threads:[~2009-05-01 17:29 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-30 19:54 [PATCH v2 0/6] macros for section name cleanup Tim Abbott
2009-04-30 19:54 ` [PATCH v2 1/6] Add new macros for page-aligned data and bss sections Tim Abbott
2009-04-30 19:54 ` Tim Abbott
2009-04-30 19:54 ` [PATCH v2 2/6] Add new NOSAVE_DATA linker script macro Tim Abbott
2009-04-30 19:54 ` Tim Abbott
2009-04-30 19:54 ` [PATCH v2 3/6] Add new CACHELINE_ALIGNED_DATA " Tim Abbott
2009-04-30 19:54 ` Tim Abbott
2009-04-30 19:54 ` [PATCH v2 4/6] Add new INIT_TASK_DATA() " Tim Abbott
2009-04-30 19:54 ` Tim Abbott
2009-04-30 19:54 ` [PATCH v2 5/6] Add new READ_MOSTLY_DATA(align) " Tim Abbott
2009-04-30 19:54 ` Tim Abbott
2009-04-30 19:54 ` [PATCH v2 6/6] Add support for __read_mostly to linux/cache.h Tim Abbott
2009-05-01 9:21 ` [PATCH v2 2/6] Add new NOSAVE_DATA linker script macro Sam Ravnborg
2009-05-01 9:18 ` [PATCH v2 1/6] Add new macros for page-aligned data and bss sections Sam Ravnborg
2009-05-01 13:54 ` Tim Abbott
2009-05-01 16:33 ` H. Peter Anvin
2009-05-01 17:17 ` Sam Ravnborg
2009-05-01 17:18 ` H. Peter Anvin [this message]
2009-05-01 17:44 ` Sam Ravnborg
2009-05-01 17:47 ` H. Peter Anvin
2009-05-01 23:02 ` Andreas Schwab
2009-05-01 9:04 ` [PATCH v2 0/6] macros for section name cleanup Sam Ravnborg
2009-05-01 14:21 ` Sam Ravnborg
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=49FB2EDC.9050300@zytor.com \
--to=hpa@zytor.com \
--cc=andersk@MIT.EDU \
--cc=benh@kernel.crashing.org \
--cc=chris@zankel.net \
--cc=cooloney@kernel.org \
--cc=davem@davemloft.net \
--cc=deller@gmx.de \
--cc=dev-etrax@axis.com \
--cc=dhowells@redhat.com \
--cc=geert@linux-m68k.org \
--cc=gerg@uclinux.org \
--cc=gorcunov@openvz.org \
--cc=heiko.carstens@de.ibm.com \
--cc=hskinnemoen@atmel.com \
--cc=jbarnold@MIT.EDU \
--cc=jdike@addtoit.com \
--cc=jesper.nilsson@axis.com \
--cc=kyle@mcmartin.ca \
--cc=lethal@linux-sh.org \
--cc=linux-alpha@vger.kernel.org \
--cc=linux-ia64@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-m68k@vger.kernel.org \
--cc=linux-mips@linux-mips.org \
--cc=linux-parisc@vger.kernel.org \
--cc=linux-s390@vger.kernel.org \
--cc=linux-sh@vger.kernel.org \
--cc=linuxppc-dev@ozlabs.org \
--cc=microblaze-uclinux@itee.uq.edu.au \
--cc=mingo@redhat.com \
--cc=monstr@monstr.eu \
--cc=paulus@samba.org \
--cc=ralf@linux-mips.org \
--cc=rmk+kernel@arm.linux.org.uk \
--cc=rth@twiddle.net \
--cc=sam@ravnborg.org \
--cc=schwidefsky@de.ibm.com \
--cc=sparclinux@vger.kernel.org \
--cc=starvik@axis.com \
--cc=tabbott@MIT.EDU \
--cc=takata@linux-m32r.org \
--cc=tglx@linutronix.de \
--cc=tony.luck@intel.com \
--cc=torvalds@linux-foundation.org \
--cc=uclinux-dist-devel@blackfin.uclinux.org \
--cc=user-mode-linux-devel@lists.sourceforge.net \
--cc=vda.linux@googlemail.com \
--cc=wdaher@MIT.EDU \
--cc=ysato@users.sourceforge.jp \
--cc=zippel@linux-m68k.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox