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Date:   Fri, 12 Apr 2019 16:53:28 +0200
From:   Arnd Bergmann <>
To:     Christoph Hellwig <>
Cc:     Linus Torvalds <>,
        Andrew Morton <>,
        Arnd Bergmann <>,
        linux-arch <>,,
        Linux Kernel Mailing List <>
Subject: Re: [PATCH, RFC] byteorder: sanity check toolchain vs kernel endianess

On Fri, Apr 12, 2019 at 4:36 PM Christoph Hellwig <> wrote:
> When removing some dead big endian checks in the RISC-V code Nick
> suggested that we should have some generic sanity checks.  I don't think
> we should have thos inside the RISC-V code, but maybe it might make
> sense to have these in the generic byteorder headers.  Note that these
> are UAPI headers and some compilers might not actually define
> __BYTE_ORDER__, so we first check that it actually exists.
> Suggested-by: Nick Kossifidis <>
> Signed-off-by: Christoph Hellwig <>

Acked-by: Arnd Bergmann <>

Extra checking like this is good in general, but I'm not sure I see
exactly what kind of issue one might expect to prevent with this:

All architecture asm/byteorder.h headers either include the only
possible option, or they check the compiler defined macros:

arch/arc/include/uapi/asm/byteorder.h:#ifdef __BIG_ENDIAN__
arch/arm/include/uapi/asm/byteorder.h:#ifdef __ARMEB__
arch/arm64/include/uapi/asm/byteorder.h:#ifdef __AARCH64EB__
arch/c6x/include/uapi/asm/byteorder.h:#ifdef _BIG_ENDIAN
arch/microblaze/include/uapi/asm/byteorder.h:#ifdef __MICROBLAZEEL__
arch/mips/include/uapi/asm/byteorder.h:#if defined(__MIPSEB__)
arch/nds32/include/uapi/asm/byteorder.h:#ifdef __NDS32_EB__
arch/powerpc/include/uapi/asm/byteorder.h:#ifdef __LITTLE_ENDIAN__
arch/sh/include/uapi/asm/byteorder.h:#ifdef __LITTLE_ENDIAN__
arch/xtensa/include/uapi/asm/byteorder.h:#ifdef __XTENSA_EL__

Are you worried about toolchains that define those differently
from what these headers expect? Did you encounter such a case?


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