linux-kernel - Re: [PATCH] autofs4: fix compilation without CONFIG

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Date:	Sat, 25 Feb 2012 17:31:30 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Andreas Schwab <schwab@...ux-m68k.org>
Cc:	Ian Kent <raven@...maw.net>, David Miller <davem@...emloft.net>,
	linux-kernel@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>,
	autofs@...r.kernel.org, Thomas Meyer <thomas@...3r.de>,
	Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH] autofs4: fix compilation without CONFIG_COMPAT

On Sat, Feb 25, 2012 at 2:10 PM, Andreas Schwab <schwab@...ux-m68k.org> wrote:
> The compat_daemon stuff is only needed on x86-64, and is_compat_task is
> only defined with CONFIG_COMPAT, so disable it for all other
> configurations.

Ugh, I hate the proliferation of #ifdefs in code when they aren't
really necessary.

How about this patch instead? It's small, simple, and clean. Maybe it
would even allow a few other #ifdef's to be removed (I see one in
kernel/seccomp.c, for example, although I suspect that
'mode1_syscalls_32' might also be a compat-only thing, so who knows)

And if you worry about the size of autofs_sb_info, I think that could
be made denser by using 'char' or bitfields instead of the various
ints that hold small values or flags instead.

                         Linus

View attachment "patch.diff" of type "text/x-patch" (530 bytes)