linux-kernel - Re: linux-next: Tree for March 8 (BROKEN: arch/x86/kernel/entry

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Date:	Tue, 8 Mar 2011 13:44:38 +0100
From:	Sedat Dilek <sedat.dilek@...glemail.com>
To:	Stephen Rothwell <sfr@...b.auug.org.au>,
	Matthias Klose <doko@...ian.org>
Cc:	linux-next <linux-next@...r.kernel.org>,
	debian-gcc <debian-gcc@...ts.debian.org>,
	binutils <binutils@...rceware.org>, psomas@...ab.ece.ntua.gr,
	JBeulich@...ell.com, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: linux-next: Tree for March 8 (BROKEN: arch/x86/kernel/entry_32.S?
 Debian's binutils/as?)

On 3/8/11, Sedat Dilek <sedat.dilek@...glemail.com> wrote:
> Hi,
>
> my build of linux-next (next-20110308, the same with the one from
> yesterday) is broken.
> (I translated the German output.)
>
> [ build.log ]
>   AS      arch/x86/kernel/entry_32.o
> /home/sd/src/linux-2.6/linux-2.6.38-rc7/debian/build/source_i386_none/arch/x86/kernel/entry_32.S:
> Assembler messages:
> /home/sd/src/linux-2.6/linux-2.6.38-rc7/debian/build/source_i386_none/arch/x86/kernel/entry_32.S:1421:
> Error: .size expression does not evaluate to a constant
> make[6]: *** [arch/x86/kernel/entry_32.o] Fehler 1 (Error 1)
> make[5]: *** [arch/x86/kernel] Fehler 2 (Error 2)
> make[4]: *** [arch/x86] Fehler 2 (Error 2)
> make[4]: *** Warte auf noch nicht beendete Prozesse... (Waiting for
> unfinished jobs...)
>
> I am not sure if this is a problem of Debian's binutils snapshot from
> binutils-2_21-branch (Debian-version: 2.21.0.20110302-1) from sid/i386
> or this is only a problem for x86, but I just want to let you know.
>
> FYI: The previous binutils (2.21.0.20110216-2) works fine.
>
> I have tried with reverting the last two changes to
> arch/x86/kernel/entry_32.S in linux-next:
>
> "x86: Use {push,pop}_cfi in more places" (see [1])
> "x86, asm: Cleanup unnecssary macros in asm-offsets.c" (see [2])
>
> Reverting both or [1] or [2] breaks with Debians as (2.21.0.20110302-1).
>
> BTW, [3] has a complete GIT history for the above file.
>
> So, I am unsure from where the problem exactly aroses.
> If this a known issue (and a fix around) or rings a bell to you, let
> me and others know.
>
> Thanks in advance.
>
> Regards,
> - Sedat -
>
> [1]
> http://git.kernel.org/?p=linux/kernel/git/next/linux-next.git;a=commit;h=60cf637a13932a4750da6746efd0199e8a4c341b
>
> [2]
> http://git.kernel.org/?p=linux/kernel/git/next/linux-next.git;a=commit;h=7bf04be8f48ceeeffa5b5a79734d6d6e0d59e5f8
>
> [3]
> http://git.kernel.org/?p=linux/kernel/git/next/linux-next.git;a=history;f=arch/x86/kernel/entry_32.S;h=2878821cb8c1da1d7147b26271114fa9546afe03;hb=HEAD
>

I just jumped on binutils-2_21-branch GIT and looked what changed in
gas/ directory.

So there were two patches to consider in the time 2011-03-02 and
2011-02-16 (chronological order, latest listed as first):

[1] commit a57ef8e7f3b214e0cf9ee33bb17c11f9f63bf6aa
"* symbols.c (report_op_error): Remove unnecessary forward declaration."

[2] commit 345bbf7731af2912390e72b86807eb1b2af3e27b
"PR gas/12519"

Reverting [1] still breaks build.
With reverting [1] and [2] I had success.
(Unfortunately, both patches have made changes to gas/ChangeLog, so
for isolating only [2] I had no fun and time).

As a conclusion:
It looks like the "PR gas/12519" patch breaks the linux-next kernel
(or l-n needs some modifications?).
It's up to the experts.

Hope this helps to fix the problem.

- Sedat -

P.S.: I have added both revert-patches.

[1] http://sourceware.org/git/?p=binutils.git;a=commit;h=a57ef8e7f3b214e0cf9ee33bb17c11f9f63bf6aa

[2] http://sourceware.org/git/?p=binutils.git;a=commit;h=345bbf7731af2912390e72b86807eb1b2af3e27b

View attachment "0001-Revert-symbols.c-report_op_error-Remove-unnecessary-.patch" of type "text/x-patch" (7107 bytes)

View attachment "0002-Revert-PR-gas-12519.patch" of type "text/x-patch" (3305 bytes)