linux-kernel - Re: [RFC][PATCH 06/22] x86,entry

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Date:   Fri, 5 Nov 2021 08:43:12 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org, mark.rutland@....com,
        dvyukov@...gle.com, seanjc@...gle.com, pbonzini@...hat.com,
        mbenes@...e.cz
Subject: Re: [RFC][PATCH 06/22] x86,entry_32: Remove .fixup usage

On Thu, Nov 04, 2021 at 01:39:33PM -0700, Josh Poimboeuf wrote:
> On Thu, Nov 04, 2021 at 05:47:35PM +0100, Peter Zijlstra wrote:
> > +++ b/arch/x86/include/asm/extable_fixup_types.h
> > @@ -19,4 +19,6 @@
> >  #define	EX_TYPE_DEFAULT_MCE_SAFE	12
> >  #define	EX_TYPE_FAULT_MCE_SAFE		13
> >  
> > +#define EX_TYPE_POP_SEG			14
> > +
> 
> This looks funky in the patch (but not in the editor), those other ones
> have a tab after '#define'.

Argh, I thought I'd fixed all those :/ I'll go make it a tab.

> >  #endif
> > --- a/arch/x86/mm/extable.c
> > +++ b/arch/x86/mm/extable.c
> > @@ -99,6 +99,13 @@ static bool ex_handler_clear_fs(const st
> >  	return ex_handler_default(fixup, regs);
> >  }
> >  
> > +static bool ex_handler_pop_seg(const struct exception_table_entry *fixup,
> > +			       struct pt_regs *regs)
> > +{
> > +	*((unsigned int *)regs->sp) = 0;
> > +	return ex_handler_default(fixup, regs);
> > +}
> 
> Clever.  Should be "unsigned long" in case this ever gets used by
> 64-bit?  Also, I'd suggest a short comment.

I'll do both.