linux-kernel - Re: Build regressions/improvements in v5.9-rc8

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Date:   Wed, 7 Oct 2020 15:01:05 +0200
From:   Richard Weinberger <richard.weinberger@...il.com>
To:     Paul Bolle <pebolle@...cali.nl>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Richard Weinberger <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Nick Hu <nickhu@...estech.com>,
        Greentime Hu <green.hu@...il.com>,
        Vincent Chen <deanbo422@...il.com>
Subject: Re: Build regressions/improvements in v5.9-rc8

On Wed, Oct 7, 2020 at 2:47 PM Paul Bolle <pebolle@...cali.nl> wrote:
>
> Richard Weinberger schreef op wo 07-10-2020 om 14:08 [+0200]:
> > UML has no ia32 emulation and therefore no in_ia32_syscall().
> > Maybe you can check for CONFIG_IA32_EMULATION too?
>
> The pending fix is:
>     #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
>
> Since this check guards in_ia32_syscall() just checking CONFIG_IA32_EMULATION
> should do too.
>
> (Way outside my limited expertise, but anyway: is does look odd to see a call
> to in_ia32_syscall() in drivers/. All other calls are in arch/x86/. Isn't this
> a bit too x86 specific for an arch independent driver?)

Indeed. in_compat_syscall() seems to be more suitable.

But for UML this does not really help, I fear, it has also no CONFIG_COMPAT.

-- 
Thanks,
//richard