linux-kernel - Re: ftrace breaks sparc64 build

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Message-ID: <20090106113543.GS28946@ZenIV.linux.org.uk>
Date:	Tue, 6 Jan 2009 11:35:43 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Jan Beulich <jbeulich@...ell.com>
Cc:	Sam Ravnborg <sam@...nborg.org>,
	"David S. Miller" <davem@...emloft.net>,
	Ingo Molnar <mingo@...e.hu>, rostedt@...dmis.org,
	Steven Rostedt <srostedt@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	sparclinux <sparclinux@...r.kernel.org>
Subject: Re: ftrace breaks sparc64 build

On Tue, Jan 06, 2009 at 07:53:04AM +0000, Jan Beulich wrote:

> The __crc_... reference is definitely bogus - none should survive with the
> new .c->.o rule. Could you find out what object file they originate from?

So can you, by use of arcane tool known as "grep"...  It's in kernel/softirq.c
and that's genksyms parser being fucked in head.  Look for TYPEOF_KEYW
in parse.y and you'll see.  Especially amusing part is a kludge from
commit a89a0a2354ae666612968e254d650bfd04f11eb6...

> The others look like a tools side behavioral difference, as I never saw any
> such. Is this problem sparc32-specific (I tested x86 and ia64 only)? What's
> the binutils version used?

2.18.50.0.6.

And no, it's not tools side.  What it is, AFAICT, is that sparc32 has
LDFLAGS_vmlinux = -r, which leaves a metric arseload of relocs that
wouldn't have survived into vmlinux otherwise.  Look at .rela__ksymtab
in .tmp_vmlinux1, for example...
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