linux-kernel - Re: [PATCH] kernel/compat.c: mark expected switch fall-throughs

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Date:   Tue, 16 Apr 2019 18:53:27 +1000
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Deepa Dinamani <deepa.kernel@...il.com>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Kees Cook <keescook@...omium.org>, Jann Horn <jannh@...gle.com>
Subject: Re: [PATCH] kernel/compat.c: mark expected switch fall-throughs

Hi Arnd,

On Tue, 16 Apr 2019 10:32:55 +0200 Arnd Bergmann <arnd@...db.de> wrote:
>
> Acked-by: Arnd Bergmann <arnd@...db.de>

Thanks

> It's a bit inconsistent though since put_compat_sigset() has the
> comments in separate lines, as of commit 89976005536c
> ("include/linux/compat.h: mark expected switch fall-throughs").

OK, I wasn't aware of that one.

> I don't care either way, but it might be better to do it the same way
> for both.

Indeed, I will redo it that way (with your Acked-by).

> We could also consider just getting rid of put_compat_sigset() and
> get_compat_sigset() but replacing them with a combined
> put_sigset()/get_sigset() that does the right thing for both native
> and compat tasks. This lets us kill a couple of compat system
> calls that only differ in their sigset_t argument. On little-endian
> systems (which are the vast majority of the installed base), there
> is no difference anyway there is no overhead anyway since
> native and compat sigset_t are identical.

That sounds like a bigger patch that would require some real testing :-)

-- 
Cheers,
Stephen Rothwell

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