linux-ext4 - Re: [PATCH] allocate struct ext4_allocation_context from a kmem cache to save stack space

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Message-Id: <1202490041.6852.11.camel@norville.austin.ibm.com>
Date:	Fri, 08 Feb 2008 11:00:41 -0600
From:	Dave Kleikamp <shaggy@...ux.vnet.ibm.com>
To:	cmm@...ibm.com
Cc:	Eric Sandeen <sandeen@...hat.com>,
	ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH] allocate struct ext4_allocation_context from
	a	kmem	cache to save stack space


On Fri, 2008-02-08 at 08:39 -0800, Mingming Cao wrote:
> On Fri, 2008-02-08 at 09:45 -0600, Dave Kleikamp wrote:
> > On Thu, 2008-02-07 at 20:35 -0600, Eric Sandeen wrote:

> > > it'll build:
> > > 
> > > static inline struct proc_dir_entry *proc_mkdir(const char *name,
> > >         struct proc_dir_entry *parent) {return NULL;}
> > > 
> > > yes, it'll issue a printk though.  *shrug*
> > > 
> printk could be removed...so as long as it builds fine. I had looked at
> the history yesterday and find this fix
> http://lists.openwall.net/linux-ext4/2007/10/10/2
> so I was under impression that the ifdefs was added to fix compile
> issue. I did not look more closely. Maybe that's not a issue any more.

It looks like the problem is that proc_root_fs is not defined when
CONFIG_PROC_FS is undefined.  Even though proc_mkdir() is defined as an
inline function, the compile still fails.

	proc_root_ext4 = proc_mkdir(EXT4_ROOT, proc_root_fs);

Maybe the best thing would be to put some dummy define in proc_fs.h
like:

#define proc_root_fs NULL

> > > I like fewer #ifdefs better than more, but doesn't matter much to me.
> > 
> 
> Oh, I prefer fewer #ifdefs too.:-)

-- 
David Kleikamp
IBM Linux Technology Center

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