From: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
To: Kees Cook <keescook@chromium.org>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
Christophe Leroy <christophe.leroy@c-s.fr>,
Peter Zijlstra <peterz@infradead.org>,
Drew Davenport <ddavenport@chromium.org>,
Arnd Bergmann <arnd@arndb.de>,
"Steven Rostedt (VMware)" <rostedt@goodmis.org>,
Feng Tang <feng.tang@intel.com>, Petr Mladek <pmladek@suse.com>,
Mauro Carvalho Chehab <mchehab+samsung@kernel.org>,
Borislav Petkov <bp@suse.de>, YueHaibing <yuehaibing@huawei.com>,
linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 7/7] bug: Move WARN_ON() "cut here" into exception handler
Date: Tue, 10 Sep 2019 18:16:19 +0900 [thread overview]
Message-ID: <20190910091619.GA207290@jagdpanzerIV> (raw)
In-Reply-To: <201909100157.CEE99802C@keescook>
On (09/10/19 01:59), Kees Cook wrote:
> On Tue, Sep 10, 2019 at 01:05:39AM +0900, Sergey Senozhatsky wrote:
> > On (08/20/19 09:47), Kees Cook wrote:
> > [..]
> > > + /*
> > > + * BUG() and WARN_ON() families don't print a custom debug message
> > > + * before triggering the exception handler, so we must add the
> > > + * "cut here" line now. WARN() issues its own "cut here" before the
> > > + * extra debugging message it writes before triggering the handler.
> > > + */
> > > + if ((bug->flags & BUGFLAG_NO_CUT_HERE) == 0)
> > > + printk(KERN_DEFAULT CUT_HERE);
> >
> > Shouldn't this be pr_warn() or pr_crit()?
>
> The pr_* helpers here would (potentially) add unwanted prefixes, so
> those aren't used. KERN_DEFAULT is used here because that's how it's
> always been printed. I didn't want to change that for this refactoring
> work. I'm not opposed to it, generally speaking, though. :)
I just glanced through CUT_HERE users
warn_slowpath_fmt() pr_warn(CUT_HERE)
__warn_printk() pr_warn(CUT_HERE)
rdma_restrack_clean() pr_err("restrack: %s", CUT_HERE)
rdma_restrack_clean() pr_err("restrack: %s", CUT_HERE)
+ oops/panic end markers are of pr_warn() or pr_crit() log levels.
So I thought that maybe we can make it more or less similar.
But if it has always been this way (KERN_DEFAULT) then OK.
-ss
prev parent reply other threads:[~2019-09-10 9:16 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-20 16:47 [PATCH v2 7/7] bug: Move WARN_ON() "cut here" into exception handler Kees Cook
2019-08-22 22:56 ` Andrew Morton
2019-08-23 14:26 ` Christophe Leroy
2019-08-24 19:08 ` Kees Cook
2019-08-29 4:55 ` Christophe Leroy
2019-08-29 16:12 ` Kees Cook
2019-08-23 14:56 ` Christophe Leroy
2019-09-09 16:05 ` Sergey Senozhatsky
2019-09-10 8:59 ` Kees Cook
2019-09-10 9:16 ` Sergey Senozhatsky [this message]
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