linux-kernel - Re: [PATCH RFC 1/6] [HACK!] arm64/xen: create links to arch/arm include files and Xen code

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 31 May 2013 14:10:38 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	Will Deacon <Will.Deacon@....com>,
	"Ian.Campbell@...rix.com" <Ian.Campbell@...rix.com>,
	"konrad.wilk@...cle.com" <konrad.wilk@...cle.com>
Subject: Re: [PATCH RFC 1/6] [HACK!] arm64/xen: create links to arch/arm
 include files and Xen code

On Fri, May 31, 2013 at 01:02:04PM +0100, Stefano Stabellini wrote:
> On Fri, 31 May 2013, Catalin Marinas wrote:
> > On Thu, May 30, 2013 at 05:18:28PM +0100, Stefano Stabellini wrote:
> > > Most of Xen support for ARM is common between ARMv7 and ARMv8.
> > > Create links to the code under arch/arm (bleah).
> > > 
> > > Other, probably better alternatives:
> > > 
> > > - move the code to a different location, maybe the header files to
> > > include/xen/arm and the code to drivers/xen/arm (still pretty ugly)?
> > > 
> > > - create a copy of the code to arch/arm64 (even worse);
> > 
> > KVM handles this in the Makefile by referencing back to arch/arm or even
> > the generic kvm directory. I think that's the 'cleanest' ;)
> 
> Do you mean creating links in the Makefile or generating header file
> copies from the Makefile?
> Or do you mean using something like "-I arch/arm/include/asm/xen" in the
> arch/arm64 Makefile?

I meant C files being compiled directly from arch/arm (no links).

For headers, if they are specific to arm or arm64, just copy the header
in each place (e.g. not using regs->pstate in the arch/arm code with
#ifdef's). For the rest, if they cannot be made generic, one way is to
have a dummy file including the arm equivalent:

#include <../../arm/include/asm/xen/events.h>

Passing -I is dangerous as you actually need "-I arch/arm/include" which
could bring other files.

-- 
Catalin
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/