linux-kernel - Re: [PATCH 1/7] kernel: call constructors

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Message-ID: <48327379.7030506@de.ibm.com>
Date:	Tue, 20 May 2008 08:45:13 +0200
From:	Peter Oberparleiter <peter.oberparleiter@...ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Peter Oberparleiter <peter.oberparleiter@...ibm.com>,
	linux-kernel@...r.kernel.org, ltp-coverage@...ts.sourceforge.net,
	sam@...nborg.org, rusty@...tcorp.com.au
Subject: Re: [PATCH 1/7] kernel: call constructors

Andrew Morton wrote:
> On Mon, 19 May 2008 10:43:14 +0200
> Peter Oberparleiter <peter.oberparleiter@...ibm.com> wrote:
> 
>> From: Peter Oberparleiter <peter.oberparleiter@...ibm.com>
>> 
>> Call constructors during kernel init and module load. Required by the
>> gcov profiling infrastructure: gcc's profiling code uses constructors
>> to register profiling data structures.
>> 
> 
> What happens with architectures which do not use
> include/asm-generic/vmlinux.lds.h?  A quicky grep points at

In that case, no constructors would be called and as a result the gcov
debugfs directory would be empty. This should be easily fixable as the
case arises though. I've re-checked arch/*/vmlinux* and all of those
linker scripts seem to include asm-generic/vmlinux.lds.h at most via
one indirection.

> arch/m68k/kernel/vmlinux.lds.S

Includes asm-generic/vmlinux.lds.h either via vmlinux-sun3.lds or
vmlinux-std.lds.

> arch/sh/kernel/vmlinux.lds.S

Includes asm-generic/vmlinux.lds.h either via vmlinux_32.lds.S or
vmlinux_64.lds.S.

> arch/um/kernel/vmlinux.lds.S

Includes asm-generic/vmlinux.lds.h either via uml.lds.S or dyn.lds.S.


Regards,
  Peter
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