From: Joe Perches <joe@perches.com>
To: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jason Wessel <jason.wessel@windriver.com>,
linux-kernel@vger.kernel.org,
kgdb-bugreport@lists.sourceforge.net,
Andrew Morton <akpm@linux-foundation.org>,
Ingo Molnar <mingo@redhat.com>,
patches@linaro.org, linaro-kernel@lists.linaro.org,
John Stultz <john.stultz@linaro.org>,
Sumit Semwal <sumit.semwal@linaro.org>,
stable@vger.kernel.org
Subject: Re: [PATCH v2 3.18-rc3] kdb: Avoid printing KERN_ levels to consoles
Date: Fri, 07 Nov 2014 09:16:50 -0800 [thread overview]
Message-ID: <1415380610.23530.12.camel@perches.com> (raw)
In-Reply-To: <545CF847.3020409@linaro.org>
On Fri, 2014-11-07 at 16:50 +0000, Daniel Thompson wrote:
> On 07/11/14 16:04, Joe Perches wrote:
> > why insert KERN_INFO?
>
> vkdb_printf() and printk() can appear either way round in a stack
> trace. Each is capable of calling the other and a flag (kdb_trap_printk)
> is used to prevent mutual recursion.
I see.
> A complete solution would require a means to know whether vkdb_printf()
> were entered directly or from printk(). A flag passed to vkdb_printf()
> would achieve this. I'll take a look.
That bit seems pretty simple and sensible.
I don't know this code at all but would it be better if
the kdb_trap_printk accesses were converted to atomic_<foo>?
Might this bit in vkdb_printf:
saved_trap_printk = kdb_trap_printk;
kdb_trap_printk = 0;
be better atomic_xchg?
and the kdb_trap_printk++ bits as atomic_inc, etc...
next prev parent reply other threads:[~2014-11-07 17:16 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-24 10:38 [PATCH 3.17rc4] kdb: Avoid printing KERN_ levels to consoles Daniel Thompson
2014-11-06 15:27 ` [RESEND PATCH 3.18-rc3] " Daniel Thompson
2014-11-06 16:13 ` Joe Perches
2014-11-06 17:22 ` Daniel Thompson
2014-11-06 17:43 ` Joe Perches
2014-11-07 9:57 ` Daniel Thompson
2014-11-07 10:10 ` Joe Perches
2014-11-07 12:01 ` [PATCH v2 " Daniel Thompson
2014-11-07 16:04 ` Joe Perches
2014-11-07 16:50 ` Daniel Thompson
2014-11-07 17:16 ` Joe Perches [this message]
2014-11-07 17:27 ` Daniel Thompson
2014-11-07 18:47 ` [PATCH v3 " Daniel Thompson
2014-11-07 19:03 ` Joe Perches
2014-11-17 1:13 ` Joe Perches
2015-01-07 15:31 ` [RESEND PATCH v3 3.19-rc2] " Daniel Thompson
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