linux-kernel - Re: [PATCH 1/3] x86/mpx: tweak header name

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Date:   Fri, 8 Feb 2019 16:43:37 -0500
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org
Subject: Re: [PATCH 1/3] x86/mpx: tweak header name

On Fri, Feb 08, 2019 at 04:42:39PM +0100, Borislav Petkov wrote:
> On Fri, Feb 08, 2019 at 01:02:53AM -0500, Michael S. Tsirkin wrote:
> > Use linux/mman.h to make sure we get all mmap flags we need.
> 
> Why, asm/mman.h is not enough or is this fixing a build issue or what is that
> patch supposed to address?

Coding style violation: if a linux/foo.h exists then it must
be included in preference to asm/foo.h

And the specific issue is that a follow-up patch moves code from
asm/mman.h to linux/mman.h so if any one was indirectly using
this header it will now miss the symbols that are being moved.





> > 
> > Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> > ---
> >  arch/x86/mm/mpx.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/arch/x86/mm/mpx.c b/arch/x86/mm/mpx.c
> > index de1851d15699..c805db6236b4 100644
> > --- a/arch/x86/mm/mpx.c
> > +++ b/arch/x86/mm/mpx.c
> > @@ -9,12 +9,12 @@
> >  #include <linux/kernel.h>
> >  #include <linux/slab.h>
> >  #include <linux/mm_types.h>
> > +#include <linux/mman.h>
> >  #include <linux/syscalls.h>
> >  #include <linux/sched/sysctl.h>
> >  
> >  #include <asm/insn.h>
> >  #include <asm/insn-eval.h>
> > -#include <asm/mman.h>
> >  #include <asm/mmu_context.h>
> >  #include <asm/mpx.h>
> >  #include <asm/processor.h>
> > -- 
> 
> Thx.
> 
> -- 
> Regards/Gruss,
>     Boris.
> 
> Good mailing practices for 400: avoid top-posting and trim the reply.