linux-kernel - Re: [PATCH v6 5/6] powerpc/64: Make COMPAT user-selectable disabled on littleendian by default.

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Date:   Fri, 30 Aug 2019 22:23:33 +0200
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Michal Suchanek <msuchanek@...e.de>, linuxppc-dev@...ts.ozlabs.org
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Hari Bathini <hbathini@...ux.ibm.com>,
        Joel Stanley <joel@....id.au>,
        Andrew Donnellan <andrew.donnellan@....ibm.com>,
        Firoz Khan <firoz.khan@...aro.org>,
        Breno Leitao <leitao@...ian.org>,
        Russell Currey <ruscur@...sell.cc>,
        Nicolai Stange <nstange@...e.de>,
        Michael Neuling <mikey@...ling.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Arnd Bergmann <arnd@...db.de>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Christian Brauner <christian@...uner.io>,
        David Howells <dhowells@...hat.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Allison Randal <allison@...utok.net>,
        David Hildenbrand <david@...hat.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 5/6] powerpc/64: Make COMPAT user-selectable disabled
 on littleendian by default.



Le 30/08/2019 à 20:57, Michal Suchanek a écrit :
> On bigendian ppc64 it is common to have 32bit legacy binaries but much
> less so on littleendian.
> 
> Signed-off-by: Michal Suchanek <msuchanek@...e.de>

Reviewed-by: Christophe Leroy <christophe.leroy@....fr>


> ---
> v3: make configurable
> ---
>   arch/powerpc/Kconfig | 5 +++--
>   1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
> index 5bab0bb6b833..b0339e892329 100644
> --- a/arch/powerpc/Kconfig
> +++ b/arch/powerpc/Kconfig
> @@ -264,8 +264,9 @@ config PANIC_TIMEOUT
>   	default 180
>   
>   config COMPAT
> -	bool
> -	default y if PPC64
> +	bool "Enable support for 32bit binaries"
> +	depends on PPC64
> +	default y if !CPU_LITTLE_ENDIAN
>   	select COMPAT_BINFMT_ELF
>   	select ARCH_WANT_OLD_COMPAT_IPC
>   	select COMPAT_OLD_SIGACTION
>