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From: Jan Beulich <jbeulich@suse.com>
To: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: George Dunlap <George.Dunlap@eu.citrix.com>,
	Ian Jackson <iwj@xenproject.org>,
	Stefano Stabellini <sstabellini@kernel.org>, Wei Liu <wl@xen.org>,
	Julien Grall <julien@xen.org>,
	Dario Faggioli <dfaggioli@suse.com>,
	Xen-devel <xen-devel@lists.xenproject.org>
Subject: Re: [PATCH 6/6] xen/trace: Minor code cleanup
Date: Mon, 20 Sep 2021 11:15:37 +0200	[thread overview]
Message-ID: <9b3bc06a-43a3-06b2-e109-bcbbb46ef087@suse.com> (raw)
In-Reply-To: <20210917084559.22673-7-andrew.cooper3@citrix.com>

On 17.09.2021 10:45, Andrew Cooper wrote:
>  * Delete trailing whitespace
>  * Replace an opencoded DIV_ROUND_UP()
>  * Drop bogus smp_rmb() - spin_lock_irqsave() has full smp_mb() semantics.
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>

Largely
Reviewed-by: Jan Beulich <jbeulich@suse.com>
One remark:

> @@ -717,9 +713,6 @@ void __trace_var(u32 event, bool_t cycles, unsigned int extra,
>      if ( !cpumask_test_cpu(smp_processor_id(), &tb_cpu_mask) )
>          return;
>  
> -    /* Read tb_init_done /before/ t_bufs. */
> -    smp_rmb();
> -
>      spin_lock_irqsave(&this_cpu(t_lock), flags);
>  
>      buf = this_cpu(t_bufs);

I wonder whether the comment wouldn't be helpful to move down here,
in of course a slightly edited form (going from /before/ to /after/).

Jan



      reply	other threads:[~2021-09-20  9:15 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-17  8:45 [PATCH 0/6] xen/trace: Fix leakage of uninitialised stack into the tracebuffer Andrew Cooper
2021-09-17  8:45 ` [PATCH 1/6] xen/trace: Don't over-read trace objects Andrew Cooper
2021-09-17 12:58   ` Jan Beulich
2021-09-17 13:26     ` Andrew Cooper
2021-09-20  8:00       ` Jan Beulich
2021-09-20 10:24         ` Andrew Cooper
2021-09-17  8:45 ` [PATCH 2/6] xen/memory: Remove tail padding from TRC_MEM_* records Andrew Cooper
2021-09-17 13:04   ` Jan Beulich
2021-09-17  8:45 ` [PATCH 3/6] xen/credit2: Remove tail padding from TRC_CSCHED2_* records Andrew Cooper
2021-09-17 13:10   ` Jan Beulich
2021-09-17 13:28     ` Andrew Cooper
2021-09-17  8:45 ` [PATCH 4/6] x86/trace: Reduce stack usage from HVMTRACE_ND() Andrew Cooper
2021-09-20  9:05   ` Jan Beulich
2021-09-20 11:02     ` Andrew Cooper
2021-09-20 13:00       ` Jan Beulich
2021-09-17  8:45 ` [PATCH 5/6] xen/credit2: Clean up trace handling Andrew Cooper
2021-09-20  9:11   ` Jan Beulich
2021-09-17  8:45 ` [PATCH 6/6] xen/trace: Minor code cleanup Andrew Cooper
2021-09-20  9:15   ` Jan Beulich [this message]

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