linux-kernel - Re: [PATCH] lpfc: nvmet

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Date:   Sat, 20 May 2017 21:10:59 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Joe Perches <joe@...ches.com>
Cc:     James Smart <james.smart@...adcom.com>,
        Dick Kennedy <dick.kennedy@...adcom.com>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Hannes Reinecke <hare@...e.com>,
        Johannes Thumshirn <jthumshirn@...e.de>,
        linux-scsi@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] lpfc: nvmet_fc: fix format string

On Sat, May 20, 2017 at 12:28 PM, Joe Perches <joe@...ches.com> wrote:
> On Fri, 2017-05-19 at 10:04 +0200, Arnd Bergmann wrote:
>> The lpfc_nvmeio_data() tracing helper always takes a format string and
>> three additional arguments.
>
> No it doesn't.  It takes a format and arguments.
>
> I don't disagree with the patch, just the characterization
> of the lpfc_mvmeio_data call in the commit message.

I think my description is correct, it's just not obvious from
reading the code until you also look at the lpfc_debugfs_nvme_trc
prototype:

extern void lpfc_debugfs_nvme_trc(struct lpfc_hba *phba, char *fmt,
                                uint16_t data1, uint16_t data2, uint32_t data3);
#define lpfc_nvmeio_data(phba, fmt, arg...) \
        { \
        if (phba->nvmeio_trc_on) \
                lpfc_debugfs_nvme_trc(phba, fmt, ##arg); \
        }


This is trying to do the same thing as the regular Linux tracepoints,
but is called in a lot of places that are all required to pass exactly
three integer arguments along with a matching format string.

      Arnd