linux-kernel - Re: [PATCH] [v2] ARM: oabi-compat: fix epoll

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Date:   Wed, 29 Apr 2020 22:13:18 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>
Cc:     Christoph Hellwig <hch@....de>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linux API <linux-api@...r.kernel.org>
Subject: Re: [PATCH] [v2] ARM: oabi-compat: fix epoll_ctl build failure

On Wed, Apr 29, 2020 at 3:35 PM Russell King - ARM Linux admin
<linux@...linux.org.uk> wrote:
> On Wed, Apr 29, 2020 at 03:23:24PM +0200, Arnd Bergmann wrote:
> > Two functions are not declared or defined when CONFIG_EPOLL is
> > disabled:
> >
>
> I know what Chris said, but do we really want to be polluting generic
> kernel files with arch specific stuff like this?

The file already has a couple of architecture specific syscalls listed already,
so it shouldn't be a big deal. If you prefer the first version of my patch,
or have another suggestion, I don't mind sending a v3 that does it differently
again.

Unfortunately, COND_SYSCALL() is a locally defined macro in that file,
so we can't easily use it elsewhere without duplicating it like in
kernel/time/posix-stubs.c.

As I mentioned in v1, it's also possible to just make this function
compile without #ifdefs by having conditional stub definitions of the
missing interfaces.

      Arnd