Re: [PATCH v4 15/17] x86/traps: Fixup general protection faults caused by UMIP

From	Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH v4 15/17] x86/traps: Fixup general protection faults caused by UMIP
Date	2017-02-23 23:20 +0100
Message-ID	<te9TX-7sz-7@gated-at.bofh.it> (permalink)
References	<tdVei-5Qz-5@gated-at.bofh.it> <tdVnY-5XM-27@gated-at.bofh.it> <tdXSP-7Pd-29@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

On Thu, 2017-02-23 at 10:27 +0100, Peter Zijlstra wrote:
> On Wed, Feb 22, 2017 at 10:37:04PM -0800, Ricardo Neri wrote:
> > @@ -492,6 +493,9 @@ do_general_protection(struct pt_regs *regs, long error_code)
> >  	RCU_LOCKDEP_WARN(!rcu_is_watching(), "entry code didn't wake RCU");
> >  	cond_local_irq_enable(regs);
> >  
> > +	if (user_mode(regs) && (fixup_umip_exception(regs) == true))
> > +		return;
> 
> I'm thinking
> 
> 	if (user_mode(regs) && fixup_umip_exception(regs))
> 		return;
> 
> is actually easier to read.

In a previous version Andy Lutomirsky suggested that 
	if (user_mode(regs) && (fixup_umip_exception(regs) == 0))

was easier to read :). Although at the time fixup_umip_exception
returned a numeric value. Now it only returns true/false for
successful/failed emulation. If with true/false not comparing to true
makes it easier to read, I will make the change.

Thanks and BR,
Ricardo

Thread

[PATCH v4 15/17] x86/traps: Fixup general protection faults caused by UMIP Ricardo Neri <ricardo.neri-calderon@linux.intel.com> - 2017-02-23 07:50 +0100
  Re: [PATCH v4 15/17] x86/traps: Fixup general protection faults  caused by UMIP Peter Zijlstra <peterz@infradead.org> - 2017-02-23 10:30 +0100
    Re: [PATCH v4 15/17] x86/traps: Fixup general protection faults  caused by UMIP Ricardo Neri <ricardo.neri-calderon@linux.intel.com> - 2017-02-23 23:20 +0100
      Re: [PATCH v4 15/17] x86/traps: Fixup general protection faults  caused by UMIP Andy Lutomirski <luto@amacapital.net> - 2017-02-24 20:30 +0100
        Re: [PATCH v4 15/17] x86/traps: Fixup general protection faults  caused by UMIP Ricardo Neri <ricardo.neri-calderon@linux.intel.com> - 2017-02-24 20:40 +0100
          Re: [PATCH v4 15/17] x86/traps: Fixup general protection faults caused by UMIP "H. Peter Anvin" <hpa@zytor.com> - 2017-02-24 20:50 +0100

csiph-web