linux-kernel - Re: [PATCH] i2c: aspeed: Add newline characters into message printings.

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Message-ID: <c13fc12e859f7bdb300f08ad805cdf6d7ec09f52.camel@perches.com>
Date:   Wed, 11 Jul 2018 10:10:03 -0700
From:   Joe Perches <joe@...ches.com>
To:     Jae Hyun Yoo <jae.hyun.yoo@...ux.intel.com>,
        Brendan Higgins <brendanhiggins@...gle.com>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>, linux-i2c@...r.kernel.org,
        OpenBMC Maillist <openbmc@...ts.ozlabs.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-aspeed@...ts.ozlabs.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        jarkko.nikula@...ux.intel.com, james.feist@...ux.intel.com,
        vernon.mauery@...ux.intel.com
Subject: Re: [PATCH] i2c: aspeed: Add newline characters into message
 printings.

On Wed, 2018-07-11 at 09:53 -0700, Jae Hyun Yoo wrote:
> On 7/10/2018 10:42 PM, Brendan Higgins wrote:
> > On Mon, Jul 2, 2018 at 2:14 PM Jae Hyun Yoo <jae.hyun.yoo@...ux.intel.com> wrote:
> > > There are some log printing without a newline character. This
> > > patch adds the missing newline characters.
[]
> > > diff --git a/drivers/i2c/busses/i2c-aspeed.c b/drivers/i2c/busses/i2c-aspeed.c
[]
> > > @@ -431,7 +431,7 @@ static bool aspeed_i2c_master_irq(struct aspeed_i2c_bus *bus)
> > >           */
> > >          if (bus->master_state == ASPEED_I2C_MASTER_START) {
> > >                  if (unlikely(!(irq_status & ASPEED_I2CD_INTR_TX_ACK))) {
> > > -                       pr_devel("no slave present at %02x", msg->addr);
> > > +                       pr_devel("no slave present at %02x\n", msg->addr);
> > 
> > Unless something changed in the last couple versions of the kernel, this is the
> > only line that actually changes anything. dev_* inserts a newline for every
> > call.

Not true.

Any printk without KERN_CONT inserts a newline
if the last character
emitted is not a newline.

dev_<level> uses can also be followed by pr_cont.

So this patch does reduce the possibility of
interleaved messages from multiple processes.