linux-kernel - Re: [BUILD BUG][3.16-rc3] Error: too many copied sections (max = 13)

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Date:	Wed, 2 Jul 2014 14:30:26 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [BUILD BUG][3.16-rc3] Error: too many copied sections (max = 13)

On Wed, Jul 2, 2014 at 2:28 PM, Andrew Morton <akpm@...ux-foundation.org> wrote:
> On Tue, 1 Jul 2014 00:09:13 -0400 Steven Rostedt <rostedt@...dmis.org> wrote:
>
>> Testing the latest kernel (3.16-rc3) I hit this build bug:
>>
>>   VDSO2C  arch/x86/vdso/vdso-image-64.c
>> Error: too many copied sections (max = 13)
>> /arch/x86/vdso/Makefile:61: recipe for target 'arch/x86/vdso/vdso-image-64.c' failed
>> make[3]: *** [arch/x86/vdso/vdso-image-64.c] Error 1
>> /scripts/Makefile.build:404: recipe for target 'arch/x86/vdso' failed
>> make[2]: *** [arch/x86/vdso] Error 2
>>
>> I bisected it down to this commit:
>>
>> commit 0e3727a8839c988a3c56170bc8da76d55a16acad
>> Author: Andy Lutomirski <luto@...capital.net>
>> Date:   Wed Jun 18 15:59:49 2014 -0700
>>
>>     x86/vdso: Remove some redundant in-memory section headers
>>
>> When I revert this commit, it compiles fine.
>
> When I revert that I get
>
> Error: cannot handle memsz != filesz
> make[2]: *** [arch/x86/vdso/vdso-image-64.c] Error 1
> make[1]: *** [arch/x86/vdso] Error 2
> make[1]: *** Waiting for unfinished jobs....
> In file included from include/linux/poll.h:11,
>                  from include/linux/ring_buffer.h:7,
>                  from include/linux/ftrace_event.h:5,
>                  from include/trace/syscall.h:6,
>                  from include/linux/syscalls.h:80,
>                  from kernel/capability.c:17:
>
> Productivity decline...

I think that patch is a false alarm.  It was almost certainly broken a
little earlier.

Nonetheless, I hereby give up.  I'll try to get a patch out today or
tomorrow to revert the reordering of vvar and the vdso.

--Andy

-- 
Andy Lutomirski
AMA Capital Management, LLC
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