Re: [PATCH v6] Move BTRFS RCU string to common library

From: Omar Sandoval
Date: Sun Nov 09 2014 - 02:32:58 EST


On Sat, Nov 08, 2014 at 08:13:37AM -0800, Joe Perches wrote:
> On Sat, 2014-11-08 at 00:46 -0800, Omar Sandoval wrote:
> > The RCU-friendly string API used internally by BTRFS is generic enough for
> > common use. This doesn't add any new functionality, but instead just moves the
> > code and documents the existing API.
>
> Some more trivia, can be updated later if desired.
>
> > diff --git a/include/linux/rcustring.h b/include/linux/rcustring.h
> > new file mode 100644
> []
> > +
> > +/**
> > + * printk_in_rcu() - printk in an RCU read-side critical section
>
> It'd be nice to show the arguments for kernel-doc here
My impression is that referencing printk tells you everything you need to know,
but for completeness' sake, that sounds fair.

> > + */
> > +#define printk_in_rcu(fmt, ...) \
> > + do { \
> > + rcu_read_lock(); \
> > + printk(fmt, __VA_ARGS__); \
>
> This should use ##__VA_ARGS__ to allow the
> compiler to elide the comma when using
>
> printk_in_rcu("Hello World!");
>
Luckily, there's probably no sane reason anyone would do a printk_in_rcu
without the varargs, but once again, it's probably good hygiene.

Anyone else have anything to add? Otherwise, I'll wrap this up in another
iteration of the patch.

Thanks!
--
Omar
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