linux-kernel - Re: [patch 1/4] Linux Kernel Markers

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Date:	Wed, 19 Sep 2007 14:50:22 -0400
From:	Mathieu Desnoyers <compudj@...stal.dyndns.org>
To:	Denys Vlasenko <vda.linux@...glemail.com>
Cc:	"Frank Ch. Eigler" <fche@...hat.com>,
	Christoph Hellwig <hch@...radead.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 1/4] Linux Kernel Markers - Architecture Independent Code

* Mathieu Desnoyers (mathieu.desnoyers@...ymtl.ca) wrote:
> * Denys Vlasenko (vda.linux@...glemail.com) wrote:
> > On Wednesday 19 September 2007 12:37, Mathieu Desnoyers wrote:
> > > > Index: linux-2.6-lttng/include/asm-generic/vmlinux.lds.h
> > > > ===================================================================
> > > > --- linux-2.6-lttng.orig/include/asm-generic/vmlinux.lds.h	2007-09-14 10:11:18.000000000 -0400
> > > > +++ linux-2.6-lttng/include/asm-generic/vmlinux.lds.h	2007-09-14 10:11:31.000000000 -0400
> > > > @@ -129,6 +133,11 @@
> > > >  		VMLINUX_SYMBOL(__stop___immediate) = .;			\
> > > >  	}								\
> > > >  									\
> > > > +	/* Markers: strings */						\
> > > > +        __markers_strings : AT(ADDR(__markers_strings) - LOAD_OFFSET) {	\
> > > > +		*(__markers_strings)					\
> > > > + 	}								\
> > > > +									\
> > > >  	/* Kernel symbol table: strings */				\
> > > >          __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) {	\
> > > >  		*(__ksymtab_strings)					\
> > > [...]
> > > 
> > > Do you think I should also remove the __markers_strings section from here ?
> > 
> > Yes.
> > 
> > It will be beneficial if one can read include/asm-generic/vmlinux.lds.h and
> > arch/$ARCH/kernel/vmlinux.lds.S and understand which sections in resulting
> > vmlinux serve what purpose. A comment atop each section explaining
> > its role will be nice. Even more so that not many people are fluent
> > in ld script language.
> > 
> > Currently, one will need to grep around (and not only in kernel tree -
> > you need to read depmod.c source too) in order to understand the role
> > of various sections in vmlinux.
> > 
> > There are dearth of comments in ld scripts, and some sections
> > are created "just because I felt like it". For example, there are
> > ".data.page_aligned" and ".data.percpu" sections - can you
> > easily tell which one has to be a section, and which does not need
> > to be one (can be merged with ".data")? Maybe both must be sections?
> > Or none of them?
> > --
> > vda
> 
> Oh, wait.. I need it in module.c:
> 
> immediateindex = find_sec(hdr, sechdrs, secstrings, "__immediate");
> 
> I'll leave the section there then.
> 
> Mathieu

Sorry, let me take this back. It applies to what is linked in the core
image, but I believe it does not apply to the kernel modules.

Mathieu

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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