From: Randy Dunlap <randy.dunlap@oracle.com>
To: Valdis.Kletnieks@vt.edu
Cc: Andrew Morton <akpm@linux-foundation.org>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Lai Jiangshan <laijs@cn.fujitsu.com>,
linux-kernel@vger.kernel.org
Subject: Re: 2.6.39-rc6-mmotm0506 and -next - __kfree_rcu breaks third-party kernel code
Date: Mon, 09 May 2011 10:14:30 -0700 [thread overview]
Message-ID: <4DC820F6.80809@oracle.com> (raw)
In-Reply-To: <14010.1304960192@localhost>
On 05/09/11 09:56, Valdis.Kletnieks@vt.edu wrote:
> On Mon, 09 May 2011 09:17:57 PDT, Randy Dunlap said:
>
>> I'd be happy to see a simple fix, but we don't generally support building
>> external modules without using the kernel kbuild infrastructure AFAIK --
>> and when I add a Makefile along with your kernconf.c file, it builds successfully
>> on mmotm-2011-0506-1639.
>
> And in fact the module *does* use the Makefile stuff for the actual build - it
> was just the installer's "am I looking at a sane 2.6 tree" sanity check that
> bombed. So I go looking for what special sauce the Makefile adds to make it
> work, and....
>
> OK, *now* I'm confused. The magic sauce appears to be "-Os". Adding that makes
> the compile work. And for no obvious reason - there's something in there that
> causes indigestion, but only if the optimizer isn't invoked.
You can disable that by disabling:
CONFIG_CC_OPTIMIZE_FOR_SIZE=y
> *WTF*?
I dunno either.
> LANG=C ./kern.sh
> cat > /tmp/kernconf.c <<EOF
> #include <linux/version.h>
> #include <linux/utsname.h>
> EOF
> + cat
>
> kern="/lib/modules/2.6.39-rc6-mmotm0506/"
> + kern=/lib/modules/2.6.39-rc6-mmotm0506/
> cc -D__KERNEL__ -nostdinc -isystem /usr/lib/gcc/x86_64-redhat-linux/4.6.0/include -I${kern}/build/include -I$kern/arch/x86/include/generated -include ${kern}/build/include/generated/autoconf.h -I${kern}/build/arch/x86/include -I${kern}/include/generated -Os -c /tmp/kernconf.c
> + cc -D__KERNEL__ -nostdinc -isystem /usr/lib/gcc/x86_64-redhat-linux/4.6.0/include -I/lib/modules/2.6.39-rc6-mmotm0506//build/include -I/lib/modules/2.6.39-rc6-mmotm0506//arch/x86/include/generated -include /lib/modules/2.6.39-rc6-mmotm0506//build/include/generated/autoconf.h -I/lib/modules/2.6.39-rc6-mmotm0506//build/arch/x86/include -I/lib/modules/2.6.39-rc6-mmotm0506//include/generated -Os -c /tmp/kernconf.c
> cc -D__KERNEL__ -nostdinc -isystem /usr/lib/gcc/x86_64-redhat-linux/4.6.0/include -I${kern}/build/include -I$kern/arch/x86/include/generated -include ${kern}/build/include/generated/autoconf.h -I${kern}/build/arch/x86/include -I${kern}/include/generated -c /tmp/kernconf.c
> + cc -D__KERNEL__ -nostdinc -isystem /usr/lib/gcc/x86_64-redhat-linux/4.6.0/include -I/lib/modules/2.6.39-rc6-mmotm0506//build/include -I/lib/modules/2.6.39-rc6-mmotm0506//arch/x86/include/generated -include /lib/modules/2.6.39-rc6-mmotm0506//build/include/generated/autoconf.h -I/lib/modules/2.6.39-rc6-mmotm0506//build/arch/x86/include -I/lib/modules/2.6.39-rc6-mmotm0506//include/generated -c /tmp/kernconf.c
> In file included from /lib/modules/2.6.39-rc6-mmotm0506//build/include/linux/sem.h:81:0,
> from /lib/modules/2.6.39-rc6-mmotm0506//build/include/linux/sched.h:72,
> from /lib/modules/2.6.39-rc6-mmotm0506//build/include/linux/utsname.h:35,
> from /tmp/kernconf.c:2:
> /lib/modules/2.6.39-rc6-mmotm0506//build/include/linux/rcupdate.h: In function '__kfree_rcu':
> /lib/modules/2.6.39-rc6-mmotm0506//build/include/linux/rcupdate.h:822:2: error: size of unnamed array is negative
>
> rm /tmp/kernconf.c
> + rm /tmp/kernconf.c
rcupdate.h should #include <linux/kernel.h>, but I don't think that will fix this problem.
--
~Randy
*** Remember to use Documentation/SubmitChecklist when testing your code ***
next prev parent reply other threads:[~2011-05-09 17:15 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-09 15:05 2.6.39-rc6-mmotm0506 and -next - __kfree_rcu breaks third-party kernel code Valdis.Kletnieks
2011-05-09 16:17 ` Randy Dunlap
2011-05-09 16:56 ` Valdis.Kletnieks
2011-05-09 17:02 ` Valdis.Kletnieks
2011-05-09 17:14 ` Randy Dunlap [this message]
2011-05-10 15:41 ` Paul E. McKenney
2011-05-11 0:52 ` Lai Jiangshan
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=4DC820F6.80809@oracle.com \
--to=randy.dunlap@oracle.com \
--cc=Valdis.Kletnieks@vt.edu \
--cc=akpm@linux-foundation.org \
--cc=laijs@cn.fujitsu.com \
--cc=linux-kernel@vger.kernel.org \
--cc=paulmck@linux.vnet.ibm.com \
/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.