linux-kernel - Re: [PATCH 15/15] x86/headers: Remove <asm/sigcontext.h>

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Message-ID: <20150907081451.GF9187@lakka.kapsi.fi>
Date:	Mon, 7 Sep 2015 11:14:51 +0300
From:	Mikko Rapeli <mikko.rapeli@....fi>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	linux-kernel@...r.kernel.org,
	Andy Lutomirski <luto@...capital.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Brian Gerst <brgerst@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Borislav Petkov <bp@...en8.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 15/15] x86/headers: Remove <asm/sigcontext.h>

On Mon, Sep 07, 2015 at 09:37:50AM +0200, Ingo Molnar wrote:
> 
> * Mikko Rapeli <mikko.rapeli@....fi> wrote:
> 
> > > > +++ b/arch/x86/include/uapi/asm/sigcontext32.h
> > > > @@ -3,6 +3,6 @@
> > > >  
> > > >  /* This is a legacy file - all the type definitions are in sigcontext.h: */
> > > >  
> > > > -#include <uapi/asm/sigcontext.h>
> > > > +#include <asm/sigcontext.h>
> > > 
> > > There's no asm/sigcontext.h file anymore if you apply my patches - but we could 
> > > reintroduce it to make the copy of UAPI headers to user-space work as-is.
> > 
> > Actually there is, in user space :)
> 
> I mean in the kernel arch/x86/include/asm/sigcontext.h is gone (at least in that 
> series), we use the UAPI header directly.
> 
> > Then a nice solution would be for the kernel side wrapper to do like you
> > said (on top of your changes on master):
> > 
> > --- /dev/null
> > +++ b/arch/x86/include/asm/sigcontext.h
> > @@ -0,0 +1,6 @@
> > +#ifndef _ASM_X86_SIGCONTEXT_H
> > +#define _ASM_X86_SIGCONTEXT_H
> > +
> > +#include <uapi/asm/sigcontext.h>
> > +
> > +#endif /* _ASM_X86_SIGCONTEXT_H */
> > 
> > And I guess logically this belongs to commit "x86/headers: Remove
> > <asm/sigcontext.h>".
> 
> Yeah, will do this, plus some comments explaining that this is really just so that 
> we can keep the UAPI side compatible with a 'straight user-space copying of the 
> header files'.
> 
> This won't affect the kernel as we won't include asm/sigcontext.h directly. (And 
> even if we do, there's no harm done.)
> 
> Agreed?

Perfect. Thanks for takling this issue!

-Mikko
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