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

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Message-Id: <427a86fa-0f61-43b4-1423-7f78a3fd3cb1@linux.vnet.ibm.com>
Date:   Tue, 20 Jun 2017 13:44:25 +0530
From:   Anshuman Khandual <khandual@...ux.vnet.ibm.com>
To:     Ram Pai <linuxram@...ibm.com>, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org
Cc:     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 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)