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Subject: Re: [PATCH 09/15] binfmt_flat: add a ARCH_HAS_BINFMT_FLAT option
To:     Christoph Hellwig <hch@lst.de>, Greg Ungerer <gerg@linux-m68k.org>
Cc:     uclinux-h8-devel@lists.sourceforge.jp,
        linux-xtensa@linux-xtensa.org, Michal Simek <monstr@monstr.eu>,
        linux-c6x-dev@linux-c6x.org, linux-sh@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-m68k@lists.linux-m68k.org,
        linux-riscv@lists.infradead.org,
        linux-arm-kernel@lists.infradead.org
References: <20190610212015.9157-1-hch@lst.de>
 <20190610212015.9157-10-hch@lst.de>
From:   Vladimir Murzin <vladimir.murzin@arm.com>
Message-ID: <416fd8cc-6721-ff40-d90e-6755e490fd61@arm.com>
Date:   Tue, 11 Jun 2019 10:59:48 +0100
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On 6/10/19 10:20 PM, Christoph Hellwig wrote:
> Allow architectures to opt into ARCH_HAS_BINFMT_FLAT support instead of
> assuming that all nommu ports support the format.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  arch/arm/Kconfig        | 1 +
>  arch/c6x/Kconfig        | 1 +
>  arch/h8300/Kconfig      | 1 +
>  arch/m68k/Kconfig       | 1 +
>  arch/microblaze/Kconfig | 1 +
>  arch/sh/Kconfig         | 1 +
>  arch/xtensa/Kconfig     | 1 +
>  fs/Kconfig.binfmt       | 5 ++++-
>  8 files changed, 11 insertions(+), 1 deletion(-)


For ARM bits:

Reviewed-by: Vladimir Murzin <vladimir.murzin@arm.com>


> 
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> index b1b48c0bde76..695a26c68064 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig
> @@ -4,6 +4,7 @@ config ARM
>  	default y
>  	select ARCH_32BIT_OFF_T
>  	select ARCH_CLOCKSOURCE_DATA
> +	select ARCH_HAS_BINFMT_FLAT
>  	select ARCH_HAS_DEBUG_VIRTUAL if MMU
>  	select ARCH_HAS_DEVMEM_IS_ALLOWED
>  	select ARCH_HAS_ELF_RANDOMIZE
> diff --git a/arch/c6x/Kconfig b/arch/c6x/Kconfig
> index eeb0471268a0..78dfe186d708 100644
> --- a/arch/c6x/Kconfig
> +++ b/arch/c6x/Kconfig
> @@ -7,6 +7,7 @@
>  config C6X
>  	def_bool y
>  	select ARCH_32BIT_OFF_T
> +	select ARCH_HAS_BINFMT_FLAT
>  	select ARCH_HAS_SYNC_DMA_FOR_CPU
>  	select ARCH_HAS_SYNC_DMA_FOR_DEVICE
>  	select CLKDEV_LOOKUP
> diff --git a/arch/h8300/Kconfig b/arch/h8300/Kconfig
> index 7457f190caaa..ec800e9d5aad 100644
> --- a/arch/h8300/Kconfig
> +++ b/arch/h8300/Kconfig
> @@ -2,6 +2,7 @@
>  config H8300
>          def_bool y
>  	select ARCH_32BIT_OFF_T
> +	select ARCH_HAS_BINFMT_FLAT
>  	select BINFMT_FLAT_ARGVP_ENVP_ON_STACK
>  	select BINFMT_FLAT_OLD_ALWAYS_RAM
>  	select GENERIC_ATOMIC64
> diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
> index fd69ee5ad6ab..c0c43c624afa 100644
> --- a/arch/m68k/Kconfig
> +++ b/arch/m68k/Kconfig
> @@ -3,6 +3,7 @@ config M68K
>  	bool
>  	default y
>  	select ARCH_32BIT_OFF_T
> +	select ARCH_HAS_BINFMT_FLAT
>  	select ARCH_HAS_SYNC_DMA_FOR_DEVICE if HAS_DMA
>  	select ARCH_MIGHT_HAVE_PC_PARPORT if ISA
>  	select ARCH_NO_COHERENT_DMA_MMAP if !MMU
> diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig
> index f11433daab4a..d411de05b628 100644
> --- a/arch/microblaze/Kconfig
> +++ b/arch/microblaze/Kconfig
> @@ -3,6 +3,7 @@ config MICROBLAZE
>  	def_bool y
>  	select ARCH_32BIT_OFF_T
>  	select ARCH_NO_SWAP
> +	select ARCH_HAS_BINFMT_FLAT if !MMU
>  	select ARCH_HAS_DMA_COHERENT_TO_PFN if MMU
>  	select ARCH_HAS_GCOV_PROFILE_ALL
>  	select ARCH_HAS_SYNC_DMA_FOR_CPU
> diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
> index b77f512bb176..df3e6215b78c 100644
> --- a/arch/sh/Kconfig
> +++ b/arch/sh/Kconfig
> @@ -1,6 +1,7 @@
>  # SPDX-License-Identifier: GPL-2.0
>  config SUPERH
>  	def_bool y
> +	select ARCH_HAS_BINFMT_FLAT if !MMU
>  	select ARCH_HAS_PTE_SPECIAL
>  	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
>  	select ARCH_MIGHT_HAVE_PC_PARPORT
> diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
> index 6ec1b75eabc5..ebc135bda921 100644
> --- a/arch/xtensa/Kconfig
> +++ b/arch/xtensa/Kconfig
> @@ -2,6 +2,7 @@
>  config XTENSA
>  	def_bool y
>  	select ARCH_32BIT_OFF_T
> +	select ARCH_HAS_BINFMT_FLAT if !MMU
>  	select ARCH_HAS_SYNC_DMA_FOR_CPU
>  	select ARCH_HAS_SYNC_DMA_FOR_DEVICE
>  	select ARCH_NO_COHERENT_DMA_MMAP if !MMU
> diff --git a/fs/Kconfig.binfmt b/fs/Kconfig.binfmt
> index 82f7d7f234f3..286b425b30b9 100644
> --- a/fs/Kconfig.binfmt
> +++ b/fs/Kconfig.binfmt
> @@ -91,9 +91,12 @@ config BINFMT_SCRIPT
>  
>  	  Most systems will not boot if you say M or N here.  If unsure, say Y.
>  
> +config ARCH_HAS_BINFMT_FLAT
> +	bool
> +
>  config BINFMT_FLAT
>  	bool "Kernel support for flat binaries"
> -	depends on !MMU || ARM || M68K
> +	depends on ARCH_HAS_BINFMT_FLAT
>  	help
>  	  Support uClinux FLAT format binaries.
>  
>