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From: Kees Cook <keescook@chromium.org>
To: WeiXiong Liao <liaoweixiong@allwinnertech.com>
Cc: Rob Herring <robh@kernel.org>, Tony Luck <tony.luck@intel.com>,
	Vignesh Raghavendra <vigneshr@ti.com>,
	Jonathan Corbet <corbet@lwn.net>,
	Richard Weinberger <richard@nod.at>,
	Anton Vorontsov <anton@enomsg.org>,
	linux-doc@vger.kernel.org,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	linux-kernel@vger.kernel.org, Colin Cross <ccross@android.com>,
	linux-mtd@lists.infradead.org,
	Jonathan Cameron <Jonathan.Cameron@huawei.com>,
	Miquel Raynal <miquel.raynal@bootlin.com>,
	Mauro Carvalho Chehab <mchehab+samsung@kernel.org>,
	"David S. Miller" <davem@davemloft.net>
Subject: Re: [PATCH v2 03/11] pstore/blk: blkoops: support pmsg recorder
Date: Sun, 22 Mar 2020 08:59:10 -0700
Message-ID: <202003220846.978F969@keescook> (raw)
In-Reply-To: <4ddb742f-7819-25e9-7bf4-49a80823d2aa@allwinnertech.com>

On Sun, Mar 22, 2020 at 07:14:37PM +0800, WeiXiong Liao wrote:
> hi Kees Cook,
> 
> On 2020/3/19 AM 2:13, Kees Cook wrote:
> > On Fri, Feb 07, 2020 at 08:25:47PM +0800, WeiXiong Liao wrote:
> >> +config PSTORE_BLKOOPS_PMSG_SIZE
> >> +	int "pmsg size in kbytes for blkoops"
> >> +	depends on PSTORE_BLKOOPS
> >> +	depends on PSTORE_PMSG
> >> +	default 64
> > 
> > Instead of "depends on PSTORE_PMSG", you can do:
> > 
> > 	default 64 if PSTORE_PMSG
> > 	default 0
> > 
> 
> What happens if PSTORE_BLKOOPS_PMSG_SIZE is non-zero while
> PSTORE_PMSG is disabled? The pmsg recorder do not work but pstore/blk
> will always allocate zone for pmsg recorder since pmsg_size is non-zero.
> It waste storage space.

Yeah, true. This gets back to my wanting to have this be more dynamic in
the pstore core. But, yes, for now, you're right.

You can still do this for initialization:

static long pmsg_size = IS_ENABLED(CONFIG_PSTORE_PMSG)
				?  CONFIG_PSTORE_BLKOOPS_PMSG_SIZE
				: -1;

But that'll require logic changes to verify_size(). We can revisit this
after v3.

> >> @@ -611,7 +776,8 @@ static ssize_t blkz_dmesg_read(struct blkz_zone *zone,
> >>  		char *buf = kasprintf(GFP_KERNEL,
> >>  				"%s: Total %d times\n",
> >>  				record->reason == KMSG_DUMP_OOPS ? "Oops" :
> >> -				"Panic", record->count);
> >> +				record->reason == KMSG_DUMP_PANIC ? "Panic" :
> >> +				"Unknown", record->count);
> > 
> > Please use get_reason_str() here.
> > 
> 
> get_reason_str() is marked 'static' on platform.c and pstore/blk only
> support oops
> and panic, it's no need to check more reason number.

I'd still rather identical strings not be scattered around pstore. :) Go
ahead and make get_reason_str() non-static and rename it
pstore_get_reason_str(), EXPORT_SYMBOL(), add to pstore.h etc.

-- 
Kees Cook

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Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-07 12:25 [PATCH v2 00/11] pstore: mtd: support crash log to block and mtd device WeiXiong Liao
2020-02-07 12:25 ` [PATCH v2 01/11] pstore/blk: new support logger for block devices WeiXiong Liao
2020-02-26  0:52   ` Kees Cook
2020-02-27  8:21     ` liaoweixiong
2020-03-18 17:23       ` Kees Cook
2020-03-20  1:50         ` WeiXiong Liao
2020-03-20 18:20           ` Kees Cook
2020-03-22 10:28             ` WeiXiong Liao
2020-03-09  0:52     ` WeiXiong Liao
2020-02-07 12:25 ` [PATCH v2 02/11] blkoops: add blkoops, a warpper for pstore/blk WeiXiong Liao
2020-03-18 18:06   ` Kees Cook
2020-03-22 10:00     ` WeiXiong Liao
2020-03-22 15:44       ` Kees Cook
2020-02-07 12:25 ` [PATCH v2 03/11] pstore/blk: blkoops: support pmsg recorder WeiXiong Liao
2020-03-18 18:13   ` Kees Cook
2020-03-22 11:14     ` WeiXiong Liao
2020-03-22 15:59       ` Kees Cook [this message]
2020-02-07 12:25 ` [PATCH v2 04/11] pstore/blk: blkoops: support console recorder WeiXiong Liao
2020-03-18 18:16   ` Kees Cook
2020-03-22 11:35     ` WeiXiong Liao
2020-02-07 12:25 ` [PATCH v2 05/11] pstore/blk: blkoops: support ftrace recorder WeiXiong Liao
2020-03-18 18:19   ` Kees Cook
2020-03-22 11:42     ` WeiXiong Liao
2020-03-22 15:16       ` Kees Cook
2020-02-07 12:25 ` [PATCH v2 06/11] Documentation: pstore/blk: blkoops: create document for pstore_blk WeiXiong Liao
2020-03-18 18:31   ` Kees Cook
2020-03-22 12:20     ` WeiXiong Liao
2020-02-07 12:25 ` [PATCH v2 07/11] pstore/blk: skip broken zone for mtd device WeiXiong Liao
2020-03-18 18:35   ` Kees Cook
2020-03-22 12:27     ` WeiXiong Liao
2020-02-07 12:25 ` [PATCH v2 08/11] blkoops: respect for device to pick recorders WeiXiong Liao
2020-03-18 18:42   ` Kees Cook
2020-03-22 13:06     ` WeiXiong Liao
2020-02-07 12:25 ` [PATCH v2 09/11] pstore/blk: blkoops: support special removing jobs for dmesg WeiXiong Liao
2020-03-18 18:47   ` Kees Cook
2020-03-22 13:03     ` WeiXiong Liao
2020-02-07 12:25 ` [PATCH v2 10/11] blkoops: add interface for dirver to get information of blkoops WeiXiong Liao
2020-02-07 12:25 ` [PATCH v2 11/11] mtd: new support oops logger based on pstore/blk WeiXiong Liao
2020-02-18 10:34   ` Miquel Raynal
2020-02-19  1:13     ` liaoweixiong
2020-03-18 18:57   ` Kees Cook
2020-03-22 13:51     ` WeiXiong Liao
2020-03-22 15:13       ` Kees Cook

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