linux-kernel - Re: [PATCH v11 03/10] sparc64: Add support for ADI register fields, ASIs and traps

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Date:   Thu, 1 Feb 2018 22:49:32 +0100
From:   Sam Ravnborg <sam@...nborg.org>
To:     Joe Perches <joe@...ches.com>
Cc:     Khalid Aziz <khalid.aziz@...cle.com>, davem@...emloft.net,
        dave.hansen@...ux.intel.com, mhocko@...e.com, mingo@...nel.org,
        gregkh@...uxfoundation.org, glx@...utronix.de,
        kstewart@...uxfoundation.org, vijay.ac.kumar@...cle.com,
        kirill.shutemov@...ux.intel.com, nitin.m.gupta@...cle.com,
        tom.hromatka@...cle.com, allen.pais@...cle.com,
        rob.gardner@...cle.com, david.j.aldridge@...cle.com,
        babu.moger@...cle.com, bob.picco@...cle.com,
        steven.sistare@...cle.com, pasha.tatashin@...cle.com,
        vegard.nossum@...cle.com, pombredanne@...b.com,
        jane.chu@...cle.com, anthony.yznaga@...cle.com,
        sparclinux@...r.kernel.org, linux-kernel@...r.kernel.org,
        Khalid Aziz <khalid@...ehiking.org>
Subject: Re: [PATCH v11 03/10] sparc64: Add support for ADI register fields,
 ASIs and traps

> >  #define _PAGE_E_4V	  _AC(0x0000000000000800,UL) /* side-Effect          */
> >  #define _PAGE_CP_4V	  _AC(0x0000000000000400,UL) /* Cacheable in P-Cache */
> >  #define _PAGE_CV_4V	  _AC(0x0000000000000200,UL) /* Cacheable in V-Cache */
> > +/* Bit 9 is used to enable MCD corruption detection instead on M7 */
> > +#define _PAGE_MCD_4V      _AC(0x0000000000000200,UL) /* Memory Corruption    */
> 
> trivia:
> 
> There are some whitespace alignment issues here
Looks like you are fouled by the use of tabs.
When you apply the patch it is fine.

> 
> > diff --git a/arch/sparc/include/asm/ttable.h b/arch/sparc/include/asm/ttable.h
> []
> > @@ -219,6 +219,16 @@
> >  	nop;						\
> >  	nop;
> >  
> > +#define SUN4V_MCD_PRECISE				\
> > +	ldxa	[%g0] ASI_SCRATCHPAD, %g2;		\
> > +	ldx	[%g2 + HV_FAULT_D_ADDR_OFFSET], %g4;	\
> > +	ldx	[%g2 + HV_FAULT_D_CTX_OFFSET], %g5;	\
> > +	ba,pt	%xcc, etrap;				\
> > +	 rd	%pc, %g7;				\
> > +	ba,pt	%xcc, sun4v_mcd_detect_precise;		\
> > +	 nop;						\
> > +	nop;
> 
> and here and elsewhere.
> 
> It would be nicer to make all these use
> similar indentation.

The patch uses the sparc idiom to indent instructions
in the delay slot after a branch with one space.
So the space before the nop is mandatory and not a bug.

	Sam