Re: [PATCH 13/25] Unionfs: add un/likely conditionals on dir ops
From: Erez Zadok
Date: Thu Sep 27 2007 - 10:28:35 EST
In message <46FAD1D2.8030306@xxxxxxxxxx>, roel writes:
> Erez Zadok wrote:
> > @@ -194,7 +194,7 @@ int check_empty(struct dentry *dentry, struct unionfs_dir_state **namelist)
> > BUG_ON(!S_ISDIR(dentry->d_inode->i_mode));
> > - if ((err = unionfs_partial_lookup(dentry)))
> > + if (unlikely((err = unionfs_partial_lookup(dentry))))
> > goto out;
> > bstart = dbstart(dentry);
> Is it bad to leave this assignment within the unlikely()?
I don't know. Anyone? Will un/likely "break" in the above form?
Actually, it looks like assignments within conditionals are just prohibited
(even if you use double parentheses to shut gcc up :-). It's not mentioned
in the CodingStyle, but it is in scripts/checkpatch.pl. So I'll have to
take out all those assignments out of the conditionals anyway. Good. It
makes code more readable (and besides, most modern compilers will optimize
it just the same).
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