From: Alain Knaff <alain@knaff.lu>
To: Albin Tonnerre <albin.tonnerre@free-electrons.com>
Cc: Russell King - ARM Linux <linux@arm.linux.org.uk>,
sam@ravnborg.org, hpa@zytor.com, linux-kernel@vger.kernel.org,
linux-embedded@vger.kernel.org, akpm@linux-foundation.org
Subject: Re: [PATCH 4/6] Add support for LZO-compressed kernels for ARM
Date: Fri, 07 Aug 2009 13:29:09 +0200 [thread overview]
Message-ID: <4A7C1005.7010808@knaff.lu> (raw)
In-Reply-To: <20090807102117.GB4455@laptop>
On 08/07/09 12:21, Albin Tonnerre wrote:
> Indeed, they've not been applied. However, I'd rather try to understand why
> exactly this is an issue when compiling with -Os and not -O2 instead of working
> around it by removing the divisions.
>
> Regards,
Well, I for myself couldn't get it to compile _at_all_ for ARM as long as
there were any division operations in the code. My theory was that the ARM
processor doesn't have native division, and that this is being supplied by
some kind of run-time library, which is not linked with when building the
pre-boot environment. But if it works with some compilation flags but not
others, something more complex must be going on...
... or could it be that with some flags, the compiler generates "division
emulation" code, but not with others (such as when optimizing for size?)
Regards,
Alain
next prev parent reply other threads:[~2009-08-07 11:29 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-22 14:01 [PATCH 1/5] lib/decompress_*: only include <linux/slab.h> if STATIC is not defined Albin Tonnerre
2009-07-22 14:01 ` [PATCH 2/5] include/linux/unaligned/{l,b}e_byteshift.h: Fix usage for compressed kernels Albin Tonnerre
2009-07-22 14:01 ` [PATCH 3/5] Add support for LZO-compressed kernels Albin Tonnerre
2009-07-22 14:01 ` [PATCH 4/5] Add support for LZO-compressed kernels for ARM Albin Tonnerre
2009-07-22 14:01 ` [PATCH 5/5] Add support for LZO-compressed kernels on x86 Albin Tonnerre
2009-07-29 15:37 ` [PATCH] Add LZO compression support for initramfs and old-style initrd Albin Tonnerre
2009-07-29 20:00 ` [PATCH 5/5] Add support for LZO-compressed kernels on x86 H. Peter Anvin
2009-07-29 21:02 ` Sam Ravnborg
2009-07-31 7:51 ` Albin Tonnerre
2009-07-31 9:31 ` Sam Ravnborg
2009-08-03 14:58 ` [PATCH 1/6] lib/decompress_*: only include <linux/slab.h> if STATIC is not defined Albin Tonnerre
2009-08-03 14:58 ` [PATCH 2/6] include/linux/unaligned/{l,b}e_byteshift.h: Fix usage for compressed kernels Albin Tonnerre
2009-08-03 14:58 ` [PATCH 3/6] Add support for LZO-compressed kernels Albin Tonnerre
2009-08-03 14:58 ` [PATCH 4/6] Add support for LZO-compressed kernels for ARM Albin Tonnerre
2009-08-03 14:58 ` [PATCH 5/6] Add support for LZO-compressed kernels on x86 Albin Tonnerre
2009-08-03 14:58 ` [PATCH 6/6] Add LZO compression support for initramfs and old-style initrd Albin Tonnerre
2009-08-03 15:12 ` H. Peter Anvin
2009-08-03 16:05 ` Albin Tonnerre
2009-08-03 15:11 ` [PATCH 5/6] Add support for LZO-compressed kernels on x86 H. Peter Anvin
2009-08-06 22:40 ` [PATCH 4/6] Add support for LZO-compressed kernels for ARM Russell King - ARM Linux
2009-08-07 9:24 ` Albin Tonnerre
2009-08-07 9:34 ` Russell King - ARM Linux
2009-08-07 9:36 ` Alain Knaff
2009-08-07 10:21 ` Albin Tonnerre
2009-08-07 11:29 ` Alain Knaff [this message]
2009-08-07 11:50 ` Matthieu CASTET
2009-08-07 13:01 ` Albin Tonnerre
2009-08-07 13:27 ` Matthieu CASTET
2009-08-07 13:55 ` Albin Tonnerre
2009-08-07 20:00 ` Russell King - ARM Linux
2009-08-07 20:21 ` H. Peter Anvin
2009-08-07 21:08 ` Sam Ravnborg
2009-08-11 9:44 ` Albin Tonnerre
2009-08-11 13:39 ` Sam Ravnborg
2009-08-11 14:17 ` Albin Tonnerre
2009-08-11 13:51 ` Matthieu CASTET
2009-08-11 16:03 ` H. Peter Anvin
2009-08-11 16:27 ` Albin Tonnerre
2009-08-11 16:31 ` H. Peter Anvin
2009-08-13 9:30 ` Albin Tonnerre
2009-08-13 14:07 ` H. Peter Anvin
2009-08-13 12:25 ` Albin Tonnerre
2009-08-14 10:08 ` [PATCH 4/6 v2] " Albin Tonnerre
2009-09-04 15:31 ` Albin Tonnerre
2009-08-04 23:00 ` [PATCH 3/6] Add support for LZO-compressed kernels Andrew Morton
2009-08-05 1:36 ` H. Peter Anvin
2009-08-05 9:19 ` Albin Tonnerre
2009-08-04 23:04 ` Andrew Morton
2009-08-04 22:55 ` [PATCH 2/6] include/linux/unaligned/{l,b}e_byteshift.h: Fix usage for compressed kernels Andrew Morton
2009-08-05 9:29 ` Albin Tonnerre
2009-08-05 21:19 ` Russell King - ARM Linux
2009-08-04 22:55 ` [PATCH 1/6] lib/decompress_*: only include <linux/slab.h> if STATIC is not defined Andrew Morton
2009-08-05 0:47 ` Phillip Lougher
2009-08-05 0:57 ` H. Peter Anvin
2009-08-05 1:32 ` Phillip Lougher
2009-08-05 1:08 ` Andrew Morton
2009-08-05 2:06 ` Phillip Lougher
2009-07-23 17:11 ` [PATCH 4/5] Add support for LZO-compressed kernels for ARM Albin Tonnerre
[not found] ` <0022152d7fe9b6dbcf046f4d04a6@google.com>
2009-07-22 16:08 ` [PATCH 3/5] Add support for LZO-compressed kernels H. Peter Anvin
2009-07-22 16:50 ` Albin Tonnerre
2009-07-29 13:51 ` [PATCH 3/5 v2] " Albin Tonnerre
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=4A7C1005.7010808@knaff.lu \
--to=alain@knaff.lu \
--cc=akpm@linux-foundation.org \
--cc=albin.tonnerre@free-electrons.com \
--cc=hpa@zytor.com \
--cc=linux-embedded@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux@arm.linux.org.uk \
--cc=sam@ravnborg.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;
as well as URLs for NNTP newsgroup(s).