Re: [PATCH] xfs: #define out unused parameters of xfs_bmap_add_free and xfs_btree_read_bufl

[David Chinner]

On Tue, Apr 22, 2008 at 01:20:54PM +0200, Denys Vlasenko wrote:
> Hi David,
> 
> xfs_bmap_add_free and xfs_btree_read_bufl functions
> use some of their parameters only in some cases
> (e.g. if DEBUG is defined, or on non-Linux OS :)
> 
> This patch removes these parameters using #define hack
> which makes them "disappear" without the need of uglifying
> every callsite with #ifdefs.

We don't use pre-processor hacks to hide function variables for different
config options.  The XFS header files are messy enough without adding
additional redefinitions of function types to them.

w.r.t xfs_bmap_add_free(), the correct thing to do is to factor the
debug code out into a different function that is only compiled
on debug kernels and remove all the debug checks from xfs_bmap_add_free().

As it is, I don't think that the change is worth the maintenance
cost for a few bytes of stack space in non-critical paths.

Cheers,

Dave.
-- 
Dave Chinner
Principal Engineer
SGI Australian Software Group
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