From: Matthew Wilcox <willy@infradead.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
Manfred Spraul <manfred@colorfullife.com>,
Davidlohr Bueso <dave@stgolabs.net>
Subject: Re: [PATCH] ipc: Convert ipcs_idr to XArray
Date: Sat, 18 Apr 2020 14:34:51 -0700 [thread overview]
Message-ID: <20200418213451.GS5820@bombadil.infradead.org> (raw)
In-Reply-To: <20200418131509.fb3c19bf450d618be797c030@linux-foundation.org>
On Sat, Apr 18, 2020 at 01:15:09PM -0700, Andrew Morton wrote:
> > --- a/ipc/util.c
> > +++ b/ipc/util.c
> > @@ -104,12 +104,20 @@ static const struct rhashtable_params ipc_kht_params = {
> > .automatic_shrinking = true,
> > };
> >
> > +#ifdef CONFIG_CHECKPOINT_RESTORE
>
> The code grew a few additional CONFIG_CHECKPOINT_RESTORE ifdefs.
> What's going on here? Why is CRIU special in ipc/?
"grew a few"? I added (this) one and deleted two others. From in the
middle of functions, like we usually prefer.
I mean, this is why we need something like this:
@@ -17,11 +17,11 @@ struct ipc_ids {
...
#ifdef CONFIG_CHECKPOINT_RESTORE
- int next_id;
+ int restore_id;
#endif
> > +#define set_restore_id(ids, x) ids->restore_id = x
> > +#define get_restore_id(ids) ids->restore_id
> > +#else
> > +#define set_restore_id(ids, x) do { } while (0)
> > +#define get_restore_id(ids) (-1)
> > +#endif
>
> Well these are ugly. Can't all this be done in C?
Would you rather see it done as:
static inline void set_restore_id(struct ipc_ids *ids, int id)
{
#ifdef CONFIG_CHECKPOINT_RESTORE
ids->restore_id = id;
#endif
}
static inline int get_restore_id(struct ipc_ids *ids)
{
#ifdef CONFIG_CHECKPOINT_RESTORE
return ids->restore_id;
#else
return -1;
#endif
}
next prev parent reply other threads:[~2020-04-18 21:34 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-26 15:14 [PATCH] ipc: Convert ipcs_idr to XArray Matthew Wilcox
2020-04-18 20:15 ` Andrew Morton
2020-04-18 21:34 ` Matthew Wilcox [this message]
2020-04-18 22:08 ` Andrew Morton
2020-04-20 15:35 ` Manfred Spraul
2020-04-20 17:06 ` Matthew Wilcox
2020-04-21 18:33 ` Matthew Wilcox
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