linux-kernel - Re: [PATCH 18/18] flag parameters: check magic constants

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Date:	Mon, 12 May 2008 20:54:34 -0700
From:	Ulrich Drepper <drepper@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	davidel@...ilserver.org, mtk.manpages@...il.com,
	torvalds@...ux-foundation.org
Subject: Re: [PATCH 18/18] flag parameters: check magic constants

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Andrew Morton wrote:
>> +	BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK);
> 
> The fifth assertion triggers with alpha allmodconfig.

This means the simple approach won't work for alpha.

The question is how to solve it?  I suggest the following:

- - define SOCK_NONBLOCK to some value > 16 in include/asm-alpha/socket.h

- - add #ifndef SOCK_NONBLOCK around the definition in include/linux/net.h

- - in sys_socket, sys_socketpair, sys_paccept

   int fflags = flags;
   if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) {
     fflags &= ~SOCK_NONBLOCK;
     fflags |= O_NONBLOCK;
   }

  and use fflags instead of flags in the places where we pass it on.

This has no costs on platforms other than alpha.

Shall I sent a patch?

- --
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖
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