linux-kernel - Re: [PATCH 01/11] coresight-etm4x: Adding CoreSight ETM4x driver

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 28 Apr 2015 14:28:26 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Mathieu Poirier <mathieu.poirier@...aro.org>
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-api@...r.kernel.org" <linux-api@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Kaixu Xia <kaixu.xia@...aro.org>,
	Chunyan Zhang <zhang.chunyan@...aro.org>
Subject: Re: [PATCH 01/11] coresight-etm4x: Adding CoreSight ETM4x driver

On Thu, Apr 23, 2015 at 12:40 AM, Mathieu Poirier
<mathieu.poirier@...aro.org> wrote:

> From: Pratik Patel <pratikp@...eaurora.org>
>
> This driver manages the CoreSight ETMv4 (Embedded Trace Macrocell) IP block
> to support HW assisted tracing on ARMv7 and ARMv8 architectures.
>
> Signed-off-by: Pratik Patel <pratikp@...eaurora.org>
> Signed-off-by: Kaixu Xia <xiakaixu@...wei.com>
> Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>

(...)
> +/* The number of ETMv4 currently registered */
> +static int etm4_count;
> +static struct etmv4_drvdata *etmdrvdata[NR_CPUS];

Don't you need a mutex or something around etm4_count so
as to protect it? You could also make it an atomic.

Also why is it a signed int ... unsigned int?

I know, lame comments, the runtime PM stuff looks perfect now,
someone had a refcount comment but it's doing the right thing.

Yours,
Linus Walleij
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/