linux-kernel - Re: [RFC v2 07/12] powerpc: Macro the mask used for checking DSI exception

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Date:   Tue, 20 Jun 2017 16:28:08 -0700
From:   Ram Pai <linuxram@...ibm.com>
To:     Anshuman Khandual <khandual@...ux.vnet.ibm.com>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        dave.hansen@...el.com, paulus@...ba.org,
        aneesh.kumar@...ux.vnet.ibm.com
Subject: Re: [RFC v2 07/12] powerpc: Macro the mask used for checking DSI
 exception

On Tue, Jun 20, 2017 at 01:44:25PM +0530, Anshuman Khandual wrote:
> On 06/17/2017 09:22 AM, Ram Pai wrote:
> > Replace the magic number used to check for DSI exception
> > with a meaningful value.
> > 
> > Signed-off-by: Ram Pai <linuxram@...ibm.com>
> > ---
> >  arch/powerpc/include/asm/reg.h       | 9 ++++++++-
> >  arch/powerpc/kernel/exceptions-64s.S | 2 +-
> >  2 files changed, 9 insertions(+), 2 deletions(-)
> > 
> > diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h
> > index 7e50e47..2dcb8a1 100644
> > --- a/arch/powerpc/include/asm/reg.h
> > +++ b/arch/powerpc/include/asm/reg.h
> > @@ -272,16 +272,23 @@
> >  #define SPRN_DAR	0x013	/* Data Address Register */
> >  #define SPRN_DBCR	0x136	/* e300 Data Breakpoint Control Reg */
> >  #define SPRN_DSISR	0x012	/* Data Storage Interrupt Status Register */
> > +#define   DSISR_BIT32		0x80000000	/* not defined */
> >  #define   DSISR_NOHPTE		0x40000000	/* no translation found */
> > +#define   DSISR_PAGEATTR_CONFLT	0x20000000	/* page attribute conflict */
> > +#define   DSISR_BIT35		0x10000000	/* not defined */
> >  #define   DSISR_PROTFAULT	0x08000000	/* protection fault */
> >  #define   DSISR_BADACCESS	0x04000000	/* bad access to CI or G */
> >  #define   DSISR_ISSTORE		0x02000000	/* access was a store */
> >  #define   DSISR_DABRMATCH	0x00400000	/* hit data breakpoint */
> > -#define   DSISR_NOSEGMENT	0x00200000	/* SLB miss */
> >  #define   DSISR_KEYFAULT	0x00200000	/* Key fault */
> > +#define   DSISR_BIT43		0x00100000	/* not defined */
> >  #define   DSISR_UNSUPP_MMU	0x00080000	/* Unsupported MMU config */
> >  #define   DSISR_SET_RC		0x00040000	/* Failed setting of R/C bits */
> >  #define   DSISR_PGDIRFAULT      0x00020000      /* Fault on page directory */
> > +#define   DSISR_PAGE_FAULT_MASK (DSISR_BIT32 | \
> > +				DSISR_PAGEATTR_CONFLT | \
> > +				DSISR_BADACCESS |       \
> > +				DSISR_BIT43)
> 
> Sorry missed this one. Seems like there are couple of unnecessary
> line additions in the subsequent patch which adds the new PKEY
> reason code.
> 
> -#define   DSISR_PAGE_FAULT_MASK (DSISR_BIT32 | \
> -				DSISR_PAGEATTR_CONFLT | \
> -				DSISR_BADACCESS |       \
> +#define   DSISR_PAGE_FAULT_MASK (DSISR_BIT32 |	\
> +				DSISR_PAGEATTR_CONFLT |	\
> +				DSISR_BADACCESS |	\
> +				DSISR_KEYFAULT |	\
>  				DSISR_BIT43)

i like to see them separately, one per line. But than you are right.
that is not the convention in this file. So will change it accordingly.

thanks,
RP
> 
> 

-- 
Ram Pai