linux-kernel - Re: [PATCH] hv_balloon: Update the balloon driver to use the SBRM API

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Date:   Thu, 3 Aug 2023 22:07:25 +0000
From:   Wei Liu <wei.liu@...nel.org>
To:     Boqun Feng <boqun.feng@...il.com>
Cc:     levymitchell0@...il.com, "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
        linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org,
        mikelly@...rosoft.com, peterz@...radead.org
Subject: Re: [PATCH] hv_balloon: Update the balloon driver to use the SBRM API

On Mon, Jul 31, 2023 at 02:25:13PM -0700, Boqun Feng wrote:
> Hi Mitchell,
> 
> On Wed, Jul 26, 2023 at 12:23:31AM +0000, Mitchell Levy via B4 Relay wrote:
> > From: Mitchell Levy <levymitchell0@...il.com>
> > 
> > 
> > 
> > ---
> 
> I don't know whether it's a tool issue or something else, but all words
> after the "---" line in the email will be discarded from a commit log.
> You can try to apply this patch yourself and see the result:
> 
> 	b4 shazam 20230726-master-v1-1-b2ce6a4538db@...il.com 
> 
> > This patch is intended as a proof-of-concept for the new SBRM
> > machinery[1]. For some brief background, the idea behind SBRM is using
> > the __cleanup__ attribute to automatically unlock locks (or otherwise
> > release resources) when they go out of scope, similar to C++ style RAII.
> > This promises some benefits such as making code simpler (particularly
> > where you have lots of goto fail; type constructs) as well as reducing
> > the surface area for certain kinds of bugs.
> > 
> > The changes in this patch should not result in any difference in how the
> > code actually runs (i.e., it's purely an exercise in this new syntax
> > sugar). In one instance SBRM was not appropriate, so I left that part
> > alone, but all other locking/unlocking is handled automatically in this
> > patch.
> > 
> > Link: https://lore.kernel.org/all/20230626125726.GU4253@hirez.programming.kicks-ass.net/ [1]
> > 
> > Suggested-by: Boqun Feng <boqun.feng@...il.com>
> > Signed-off-by: "Mitchell Levy (Microsoft)" <levymitchell0@...il.com>
> 
> Beside the above format issue, the code looks good to me, nice job!
> 
> Feel free to add:
> 
> Reviewed-by: Boqun Feng <boqun.feng@...il.com>
> 

FAOD I'm expecting a v2 of this patch.

Thanks,
Wei.

> Regards,
> Boqun