linux-kernel - Re: EXTRA_VERSION in #if LINUX_VERSION_CODE >= KERNEL

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Date:	Sat, 24 Jan 2009 23:54:11 +0100
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Peter Hallberg <hallberg68@...mail.com>
CC:	arjan@...radead.org, linux-kernel@...r.kernel.org
Subject: Re: EXTRA_VERSION in #if LINUX_VERSION_CODE >= KERNEL_VERSION(x,x,x)

Peter Hallberg wrote:
>>> How does one write stuff like
>>> #if LINUX_VERSION_CODE>= KERNEL_VERSION(2,6,28)
>>> if the 4 digit EXTRA_VERSION also is needed?u
>> if you need that something is wrong....
>>
>> can you be more elaborate in what you're trying to achieve ?
> 
> Between 2.6.28 and 2.6.28.1 you changed the function grab_cache_page
> to grab_cache_page_write_begin and added a flags argument. Since I
> maintain an separate filesystem module I need to take care of this.
> From the change log:
...
>     commit 54566b2c1594c2326a645a3551f9d989f7ba3c5e upstream.

There is a simple trick.  Have a look at that commit.  It adds
#define AOP_FLAG_NOFS			0x0004
to <linux/fs.h>.  You could check for it with #ifdef.

Or you could choose to not support 2.6.28, only 2.6.28.y.
-- 
Stefan Richter
-=====-==--= ---= ==---
http://arcgraph.de/sr/
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