[PATCH 1/4] x86: add __X32_COND_SYSCALL() macro

[hpa at zytor.com]

On September 19, 2020 9:23:22 AM PDT, Andy Lutomirski <luto at kernel.org> wrote:
>On Fri, Sep 18, 2020 at 10:35 PM Christoph Hellwig <hch at infradead.org>
>wrote:
>>
>> On Fri, Sep 18, 2020 at 03:24:36PM +0200, Arnd Bergmann wrote:
>> > sys_move_pages() is an optional syscall, and once we remove
>> > the compat version of it in favor of the native one with an
>> > in_compat_syscall() check, the x32 syscall table refers to
>> > a __x32_sys_move_pages symbol that may not exist when the
>> > syscall is disabled.
>> >
>> > Change the COND_SYSCALL() definition on x86 to also include
>> > the redirection for x32.
>> >
>> > Signed-off-by: Arnd Bergmann <arnd at arndb.de>
>>
>> Adding the x86 maintainers and Brian Gerst.  Brian proposed another
>> problem to the mess that most of the compat syscall handlers used by
>> x32 here:
>>
>>    https://lkml.org/lkml/2020/6/16/664
>>
>> hpa didn't particularly like it, but with your and my pending series
>> we'll soon use more native than compat syscalls for x32, so something
>> will need to change..
>
>I'm fine with either solution.

My main objection was naming. x64 is a widely used synonym for x86-64, and so that is confusing.

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