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Date: Wed, 07 Aug 2019 23:13:15 +1000
From: Michael Ellerman <mpe@...erman.id.au>
To: Jason Yan <yanaijie@...wei.com>, linuxppc-dev@...ts.ozlabs.org, diana.craciun@....com, christophe.leroy@....fr, benh@...nel.crashing.org, paulus@...ba.org, npiggin@...il.com, keescook@...omium.org, kernel-hardening@...ts.openwall.com
Cc: linux-kernel@...r.kernel.org, wangkefeng.wang@...wei.com, yebin10@...wei.com, thunder.leizhen@...wei.com, jingxiangfeng@...wei.com, fanchengyang@...wei.com, zhaohongjiang@...wei.com, Jason Yan <yanaijie@...wei.com>
Subject: Re: [PATCH v5 01/10] powerpc: unify definition of M_IF_NEEDED

Jason Yan <yanaijie@...wei.com> writes:
> M_IF_NEEDED is defined too many times. Move it to a common place.

The name is not great, can you call it MAS2_M_IF_NEEDED, which at least
gives a clue what it's for?

cheers

> Signed-off-by: Jason Yan <yanaijie@...wei.com>
> Cc: Diana Craciun <diana.craciun@....com>
> Cc: Michael Ellerman <mpe@...erman.id.au>
> Cc: Christophe Leroy <christophe.leroy@....fr>
> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Nicholas Piggin <npiggin@...il.com>
> Cc: Kees Cook <keescook@...omium.org>
> Reviewed-by: Christophe Leroy <christophe.leroy@....fr>
> Reviewed-by: Diana Craciun <diana.craciun@....com>
> Tested-by: Diana Craciun <diana.craciun@....com>
> ---
>  arch/powerpc/include/asm/nohash/mmu-book3e.h  | 10 ++++++++++
>  arch/powerpc/kernel/exceptions-64e.S          | 10 ----------
>  arch/powerpc/kernel/fsl_booke_entry_mapping.S | 10 ----------
>  arch/powerpc/kernel/misc_64.S                 |  5 -----
>  4 files changed, 10 insertions(+), 25 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/nohash/mmu-book3e.h b/arch/powerpc/include/asm/nohash/mmu-book3e.h
> index 4c9777d256fb..0877362e48fa 100644
> --- a/arch/powerpc/include/asm/nohash/mmu-book3e.h
> +++ b/arch/powerpc/include/asm/nohash/mmu-book3e.h
> @@ -221,6 +221,16 @@
>  #define TLBILX_T_CLASS2			6
>  #define TLBILX_T_CLASS3			7
>  
> +/*
> + * The mapping only needs to be cache-coherent on SMP, except on
> + * Freescale e500mc derivatives where it's also needed for coherent DMA.
> + */
> +#if defined(CONFIG_SMP) || defined(CONFIG_PPC_E500MC)
> +#define M_IF_NEEDED	MAS2_M
> +#else
> +#define M_IF_NEEDED	0
> +#endif
> +
>  #ifndef __ASSEMBLY__
>  #include <asm/bug.h>
>  
> diff --git a/arch/powerpc/kernel/exceptions-64e.S b/arch/powerpc/kernel/exceptions-64e.S
> index 1cfb3da4a84a..fd49ec07ce4a 100644
> --- a/arch/powerpc/kernel/exceptions-64e.S
> +++ b/arch/powerpc/kernel/exceptions-64e.S
> @@ -1342,16 +1342,6 @@ skpinv:	addi	r6,r6,1				/* Increment */
>  	sync
>  	isync
>  
> -/*
> - * The mapping only needs to be cache-coherent on SMP, except on
> - * Freescale e500mc derivatives where it's also needed for coherent DMA.
> - */
> -#if defined(CONFIG_SMP) || defined(CONFIG_PPC_E500MC)
> -#define M_IF_NEEDED	MAS2_M
> -#else
> -#define M_IF_NEEDED	0
> -#endif
> -
>  /* 6. Setup KERNELBASE mapping in TLB[0]
>   *
>   * r3 = MAS0 w/TLBSEL & ESEL for the entry we started in
> diff --git a/arch/powerpc/kernel/fsl_booke_entry_mapping.S b/arch/powerpc/kernel/fsl_booke_entry_mapping.S
> index ea065282b303..de0980945510 100644
> --- a/arch/powerpc/kernel/fsl_booke_entry_mapping.S
> +++ b/arch/powerpc/kernel/fsl_booke_entry_mapping.S
> @@ -153,16 +153,6 @@ skpinv:	addi	r6,r6,1				/* Increment */
>  	tlbivax 0,r9
>  	TLBSYNC
>  
> -/*
> - * The mapping only needs to be cache-coherent on SMP, except on
> - * Freescale e500mc derivatives where it's also needed for coherent DMA.
> - */
> -#if defined(CONFIG_SMP) || defined(CONFIG_PPC_E500MC)
> -#define M_IF_NEEDED	MAS2_M
> -#else
> -#define M_IF_NEEDED	0
> -#endif
> -
>  #if defined(ENTRY_MAPPING_BOOT_SETUP)
>  
>  /* 6. Setup KERNELBASE mapping in TLB1[0] */
> diff --git a/arch/powerpc/kernel/misc_64.S b/arch/powerpc/kernel/misc_64.S
> index b55a7b4cb543..26074f92d4bc 100644
> --- a/arch/powerpc/kernel/misc_64.S
> +++ b/arch/powerpc/kernel/misc_64.S
> @@ -432,11 +432,6 @@ kexec_create_tlb:
>  	rlwimi	r9,r10,16,4,15		/* Setup MAS0 = TLBSEL | ESEL(r9) */
>  
>  /* Set up a temp identity mapping v:0 to p:0 and return to it. */
> -#if defined(CONFIG_SMP) || defined(CONFIG_PPC_E500MC)
> -#define M_IF_NEEDED	MAS2_M
> -#else
> -#define M_IF_NEEDED	0
> -#endif
>  	mtspr	SPRN_MAS0,r9
>  
>  	lis	r9,(MAS1_VALID|MAS1_IPROT)@h
> -- 
> 2.17.2

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