From: Joe Perches <joe@perches.com>
To: Kay Sievers <kay@vrfy.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
Steven Rostedt <rostedt@goodmis.org>,
LKML <linux-kernel@vger.kernel.org>, Ingo Molnar <mingo@elte.hu>,
Wu Fengguang <fengguang.wu@intel.com>,
"Paul E. McKenney" <paulmck@us.ibm.com>
Subject: Re: [PATCH v3] printk: Have printk() never buffer its data
Date: Tue, 26 Jun 2012 09:30:55 -0700 [thread overview]
Message-ID: <1340728255.3359.42.camel@joe2Laptop> (raw)
In-Reply-To: <1340726856.977.6.camel@mop>
On Tue, 2012-06-26 at 18:07 +0200, Kay Sievers wrote:
[]
Just a couple trivial notes:
> diff --git a/kernel/printk.c b/kernel/printk.c
[]
> @@ -1795,6 +1831,7 @@ static u32 console_idx;
> */
> void console_unlock(void)
> {
> + static char text[LOG_LINE_MAX];
Is this static to avoid excessive stack?
Might be useful to note that.
> static u64 seen_seq;
> unsigned long flags;
> bool wake_klogd = false;
> @@ -1807,10 +1844,37 @@ void console_unlock(void)
>
> console_may_schedule = 0;
>
> + /* flush buffered message fragment immediately to console */
> + raw_spin_lock_irqsave(&logbuf_lock, flags);
> + if (cont_cons_len && (cont_cons < cont_cons_len || !cont_len)) {
> + size_t textlen = 0;
> + size_t len;
> +
> + len = cont_cons_len - cont_cons;
> + if (!cont_cons)
> + textlen = print_time(cont_ts_nsec, text);
> + memcpy(text + textlen, cont_buf + cont_cons, len);
This could overrun the 512 bytes of text yes?
next prev parent reply other threads:[~2012-06-26 16:30 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-25 19:05 [PATCH v3] printk: Have printk() never buffer its data Steven Rostedt
2012-06-25 22:07 ` Andrew Morton
2012-06-25 23:55 ` Greg Kroah-Hartman
2012-06-26 0:01 ` Linus Torvalds
2012-06-26 0:23 ` Greg Kroah-Hartman
2012-06-26 0:40 ` Linus Torvalds
2012-06-26 0:56 ` Kay Sievers
2012-06-26 1:40 ` Linus Torvalds
2012-06-26 16:07 ` Kay Sievers
2012-06-26 16:30 ` Joe Perches [this message]
2012-06-26 16:58 ` Greg Kroah-Hartman
2012-06-26 17:00 ` Kay Sievers
2012-06-26 17:02 ` Greg Kroah-Hartman
2012-06-26 18:34 ` Greg Kroah-Hartman
2012-06-26 18:38 ` Greg Kroah-Hartman
2012-06-26 18:48 ` Greg Kroah-Hartman
2012-06-27 15:13 ` Steven Rostedt
2012-06-27 15:18 ` Steven Rostedt
2012-06-27 15:26 ` Kay Sievers
2012-06-28 7:38 ` Kay Sievers
2012-06-28 1:48 ` Greg Kroah-Hartman
2012-06-28 1:54 ` Steven Rostedt
2012-06-28 2:55 ` Steven Rostedt
2012-06-29 5:30 ` Greg Kroah-Hartman
2012-06-29 11:18 ` Steven Rostedt
2012-06-29 15:40 ` Greg Kroah-Hartman
2012-06-28 5:00 ` Joe Perches
2012-07-05 7:03 ` Michael Neuling
2012-07-05 8:39 ` Kay Sievers
2012-07-05 8:53 ` Kay Sievers
2012-07-05 10:20 ` Michael Neuling
2012-07-05 11:47 ` Kay Sievers
2012-07-05 12:50 ` Kay Sievers
2012-07-06 0:41 ` Michael Neuling
2012-07-06 0:56 ` Kay Sievers
2012-07-06 3:39 ` Michael Neuling
2012-07-06 3:47 ` Michael Neuling
2012-07-06 10:46 ` Kay Sievers
2012-07-06 15:12 ` Kay Sievers
2012-07-06 21:04 ` Michael Neuling
2012-07-08 17:55 ` Kay Sievers
2012-07-09 17:09 ` Greg Kroah-Hartman
2012-07-09 17:15 ` Joe Perches
2012-07-09 22:36 ` Michael Neuling
2012-07-09 21:42 ` Joe Perches
2012-07-09 22:10 ` Kay Sievers
2012-07-09 22:29 ` Joe Perches
2012-07-09 22:40 ` Kay Sievers
2012-07-09 23:32 ` Joe Perches
2012-07-09 23:41 ` Joe Perches
2012-06-26 0:18 ` Joe Perches
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