From: Nicolas Pitre <nicolas.pitre@linaro.org>
To: Dave Martin <dave.martin@linaro.org>
Cc: Frank Hofmann <frank.hofmann@tomtom.com>,
linux-pm@lists.linux-foundation.org, tuxonice-devel@tuxonice.net,
linux-arm-kernel@lists.infradead.org
Subject: Re: [RFC PATCH] ARM hibernation / suspend-to-disk support code
Date: Fri, 20 May 2011 13:53:42 -0400 (EDT) [thread overview]
Message-ID: <alpine.LFD.2.00.1105201330590.14430__16207.675523083$1306167679$gmane$org@xanadu.home> (raw)
In-Reply-To: <20110520150348.GB3141@arm.com>
On Fri, 20 May 2011, Dave Martin wrote:
> On Fri, May 20, 2011 at 01:39:37PM +0100, Frank Hofmann wrote:
> > I've simply done there what the "setmode" macro from
> > <asm/assembler.h> is doing, have chosen not to include that file
> > because it overrides "push" on a global scale for no good reason and
> > that sort of thing makes me cringe.
>
> Actually, I guess you should be using that header, from a general
> standardisation point of view. In particular, it would be nicer to
> use setmode than to copy it.
Absolutely. If there are issues with the generic infrastructure
provided to you, by all means let's find a way to fix them instead of
locally sidestepping them.
> The setmode macro itself could be improved to use cps for Thumb-2,
> but that would be a separate (and low-priority) patch.
>
> Re the push/pop macros, I'm not sure of the history for those.
I'm responsible for those, from many years ago (November 2005 according
to Git) when push didn't even exist as an official ARM mnemonic. BTW
the converse macro is pull not pop. Those are used to write endian
independent assembly string copy routines.
> In the kernel, it seems customary to write stmfd sp!, / ldmfd sp!,
> instead of push / pop, so you could always use those mnemonics instead.
> They're equivalent.
Yes, and more importantly they're backward compatible with older
binutils version with no knowledge of the latest "unified" syntax. We
preferably don't want to break compilation with those older tools, which
is why we stick to ldmfd/stmfd.
> > >>+ stm r0!, {r4-r12,lr} /* nonvolatile regs */
This asks to be written as "stmia r0!, ..." as well for the same
reasons.
Nicolas
next prev parent reply other threads:[~2011-05-20 17:53 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <3DCE2F529B282E4B8F53D4D8AA406A07014FFE@008-AM1MPN1-022.mgdnok.nokia.com>
2011-05-19 17:31 ` [RFC PATCH] ARM hibernation / suspend-to-disk support code Frank Hofmann
2011-05-20 11:37 ` Dave Martin
2011-05-20 11:37 ` Dave Martin
2011-05-20 12:39 ` Frank Hofmann
2011-05-20 12:39 ` Frank Hofmann
2011-05-20 15:03 ` Dave Martin
2011-05-20 15:03 ` Dave Martin
2011-05-20 16:24 ` Frank Hofmann
2011-05-23 9:42 ` Dave Martin
2011-05-23 9:42 ` Dave Martin
2011-05-20 16:24 ` Frank Hofmann
2011-05-20 17:53 ` Nicolas Pitre [this message]
2011-05-20 17:53 ` Nicolas Pitre
2011-05-20 18:07 ` Russell King - ARM Linux
2011-05-20 18:07 ` Russell King - ARM Linux
2011-05-22 6:39 ` Frank Hofmann
2011-05-20 22:27 ` [linux-pm] " Rafael J. Wysocki
2011-05-22 7:01 ` Frank Hofmann
2011-05-22 9:54 ` Rafael J. Wysocki
2011-05-22 9:54 ` Rafael J. Wysocki
2011-05-22 7:01 ` Frank Hofmann
2011-05-23 9:52 ` Dave Martin
2011-05-23 9:52 ` [linux-pm] " Dave Martin
2011-05-23 13:37 ` Frank Hofmann
2011-05-23 14:32 ` Russell King - ARM Linux
2011-05-23 14:32 ` [linux-pm] " Russell King - ARM Linux
2011-05-23 15:57 ` [RFC PATCH v2] " Frank Hofmann
2011-05-23 15:57 ` Frank Hofmann
2011-05-23 13:37 ` [RFC PATCH] " Frank Hofmann
2011-05-20 22:27 ` Rafael J. Wysocki
2011-05-20 18:05 ` Russell King - ARM Linux
2011-05-20 18:05 ` Russell King - ARM Linux
2011-05-23 10:01 ` Dave Martin
2011-05-23 10:12 ` Russell King - ARM Linux
2011-05-23 10:12 ` Russell King - ARM Linux
2011-05-23 11:16 ` Dave Martin
2011-05-23 16:11 ` Russell King - ARM Linux
2011-05-23 16:38 ` Dave Martin
2011-05-24 12:33 ` Frank Hofmann
2011-05-24 12:33 ` Frank Hofmann
2011-05-23 16:38 ` Dave Martin
2011-05-23 16:11 ` Russell King - ARM Linux
2011-05-23 11:16 ` Dave Martin
2011-05-23 10:01 ` Dave Martin
2011-05-24 13:27 ` [RFC] ARM hibernation, cpu-type-specific code Frank Hofmann
2011-05-19 17:31 ` [RFC PATCH] ARM hibernation / suspend-to-disk support code Frank Hofmann
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='alpine.LFD.2.00.1105201330590.14430__16207.675523083$1306167679$gmane$org@xanadu.home' \
--to=nicolas.pitre@linaro.org \
--cc=dave.martin@linaro.org \
--cc=frank.hofmann@tomtom.com \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-pm@lists.linux-foundation.org \
--cc=tuxonice-devel@tuxonice.net \
/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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.