linux-kernel - question: attribute 'require

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Message-ID: <201109091747.18525.hartleys@visionengravers.com>
Date:	Fri, 9 Sep 2011 17:47:18 -0700
From:	H Hartley Sweeten <hartleys@...ionengravers.com>
To:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: question: attribute 'require_context'

Hello all,

I'm trying to do an allyesconfig build of the kernel on an old debian box
with gcc version, gcc (Debian 4.3.2-1.1) 4.3.2. Everything goes fine until
the DRBD device driver gets compiled. At that point I get a bunch of
error messages like this:

drivers/block/drbd/drbd_int.h:974:39 error: attribute 'require_context': unknown attribute

It looks like this is due to the following:

#ifdef __CHECKER__
# define __protected_by(x)       __attribute__((require_context(x,1,999,"rdwr")))
# define __protected_read_by(x)  __attribute__((require_context(x,1,999,"read")))
# define __protected_write_by(x) __attribute__((require_context(x,1,999,"write")))
# define __must_hold(x)       __attribute__((context(x,1,1), require_context(x,1,999,"call")))
#else
# define __protected_by(x)
# define __protected_read_by(x)
# define __protected_write_by(x)
# define __must_hold(x)
#endif

Is the require_context attribute something found in a later version of gcc?

Thanks,
Hartley
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