linux-kernel - Re: [PATCH 2/2 v3] be2iscsi: Fix some error messages

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Date:	Sat, 13 Aug 2016 10:03:02 -0700
From:	Joe Perches <joe@...ches.com>
To:	Christophe JAILLET <christophe.jaillet@...adoo.fr>,
	jayamohan.kallickal@...gotech.com, jejb@...ux.vnet.ibm.com,
	ketan.mukadam@...gotech.com, sony.john@...gotech.com,
	martin.petersen@...cle.com
Cc:	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 2/2 v3] be2iscsi: Fix some error messages

On Sat, 2016-08-13 at 09:41 -0700, Joe Perches wrote:
> On Sat, 2016-08-13 at 14:31 +0200, Christophe JAILLET wrote:
> > Le 13/08/2016 à 13:35, Joe Perches a écrit :
> > > > @@ -268,7 +268,7 @@ static int beiscsi_eh_abort(struct scsi_cmnd *sc)
> > > >   				&nonemb_cmd.dma);
> > > >   	if (nonemb_cmd.va == NULL) {
> > > >   		beiscsi_log(phba, KERN_ERR, BEISCSI_LOG_EH,
> > > > -			    "BM_%d : Failed to allocate memory for"
> > > > +			    "BM_%d : Failed to allocate memory for "
> > > >   			    "mgmt_invalidate_icds\n");

This is the first time I've looked at the beiscsi_log macro.

It sure is odd and undesirable.

It's _very_ not nice to have a format string take an implied
__LINE__ argument.

It'd be much more intelligible to take the first bit as a
separate string, concatenate it in the macro with "_%d: "
and __LINE__ (if that's really useful, I think it's not)
and emit that as the format.

Something like:

diff --git a/drivers/scsi/be2iscsi/be_main.h b/drivers/scsi/be2iscsi/be_main.h
index 30a4606..3f0fbbf 100644
--- a/drivers/scsi/be2iscsi/be_main.h
+++ b/drivers/scsi/be2iscsi/be_main.h
@@ -1084,11 +1084,12 @@ struct hwi_context_memory {
 #define __beiscsi_log(phba, level, fmt, arg...) \
 	shost_printk(level, phba->shost, fmt, __LINE__, ##arg)
 
-#define beiscsi_log(phba, level, mask, fmt, arg...) \
-do { \
-	uint32_t log_value = phba->attr_log_enable; \
-		if (((mask) & log_value) || (level[1] <= '3')) \
-			__beiscsi_log(phba, level, fmt, ##arg); \
-} while (0);
+#define beiscsi_log(phba, level, mask, prefix, fmt, ...)		\
+do {									\
+	uint32_t log_value = phba->attr_log_enable;			\
+	if (((mask) & log_value) || (level[1] <= '3'))			\
+		__beiscsi_log(phba, level, prefix "_%d: " fmt,		\
+			      ##__VA_ARGS__);				\
+} while (0)
 
 #endif

So these beiscsi_log uses become something like:

	beiscsi_log(phba, KERN_ERR, BEISCSI_LOG_EH,
		    "BM", "Failed to allocate memory for mgmt_invalidate_icds\n");

and the format and its arguments match.