linux-kernel - Re: [RFC v2 4/7] asm/sections: add a generic push_section

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Message-ID: <20160219210609.GU25240@wotan.suse.de>
Date:	Fri, 19 Feb 2016 22:06:09 +0100
From:	"Luis R. Rodriguez" <mcgrof@...nel.org>
To:	"H. Peter Anvin" <hpa@...or.com>, schwidefsky@...ibm.com,
	heiko.carstens@...ibm.com, linux-s390@...r.kernel.org
Cc:	"Luis R. Rodriguez" <mcgrof@...nel.org>, tglx@...utronix.de,
	mingo@...hat.com, bp@...en8.de, x86@...nel.org,
	linux-kernel@...r.kernel.org, luto@...capital.net,
	boris.ostrovsky@...cle.com, rusty@...tcorp.com.au,
	david.vrabel@...rix.com, konrad.wilk@...cle.com, mcb30@...e.org,
	jgross@...e.com, ming.lei@...onical.com,
	gregkh@...uxfoundation.org, arnd@...db.de,
	linux-arch@...r.kernel.org, linux@....linux.org.uk,
	benh@...nel.crashing.org, jbaron@...mai.com, ananth@...ibm.com,
	anil.s.keshavamurthy@...el.com, davem@...emloft.net,
	masami.hiramatsu.pt@...achi.com, andriy.shevchenko@...ux.intel.com,
	dwmw2@...radead.org, xen-devel@...ts.xensource.com
Subject: Re: [RFC v2 4/7] asm/sections: add a generic push_section_tbl()

On Fri, Feb 19, 2016 at 12:26:51PM -0800, H. Peter Anvin wrote:
> On 02/19/2016 05:45 AM, Luis R. Rodriguez wrote:
> > With a generic linker tables solution in place we
> > need a general asm solution for declaring entries
> > with asm. The first easy target is to cover the C
> > asm declarations, guard the header file for now
> > and define a first generic entry push_section_tbl()
> > to be used later for custom linker table annotations.
> > 
> > Signed-off-by: Luis R. Rodriguez <mcgrof@...nel.org>
> > ---
> >  include/asm-generic/sections.h | 10 ++++++++++
> >  1 file changed, 10 insertions(+)
> > 
> > diff --git a/include/asm-generic/sections.h b/include/asm-generic/sections.h
> > index af0254c09424..f5ea98bd85d2 100644
> > --- a/include/asm-generic/sections.h
> > +++ b/include/asm-generic/sections.h
> > @@ -3,8 +3,10 @@
> >  
> >  /* References to section boundaries */
> >  
> > +#ifndef __ASSEMBLY__
> >  #include <linux/compiler.h>
> >  #include <linux/types.h>
> > +#include <linux/sections.h>
> >  
> >  /*
> >   * Usage guidelines:
> > @@ -128,4 +130,12 @@ static inline bool init_section_intersects(void *virt, size_t size)
> >  	return memory_intersects(__init_begin, __init_end, virt, size);
> >  }
> >  
> > +/*
> > + * Some architectures do not like the "\t" at the end (s39), we should be
> > + * able to generalize this further, but so far this covers most architectures.
> > + */
> > +#define push_section_tbl(section, name, level, flags)			\
> > +	".pushsection " SECTION_TBL(section,name,level) ",  \"" #flags "\"\n\t"
> > +#endif
> > +
> 
> I think the \n\t is unnecessary.

Super! I wonder if we we can just use this on s390 as well without it pooping?
I ask as this would set a precedent.

  Luis