From: John Ogness <john.ogness@linutronix.de>
To: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
Linus Torvalds <torvalds@linux-foundation.org>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
Petr Mladek <pmladek@suse.com>,
Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>,
Steven Rostedt <rostedt@goodmis.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>,
kexec@lists.infradead.org,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 2/4] printk: store instead of processing cont parts
Date: Tue, 21 Jul 2020 17:03:16 +0206 [thread overview]
Message-ID: <87ft9kx6er.fsf@jogness.linutronix.de> (raw)
In-Reply-To: <20200721144220.GE44523@jagdpanzerIV.localdomain>
On 2020-07-21, Sergey Senozhatsky <sergey.senozhatsky@gmail.com> wrote:
>> That said, we have traditionally used not just "current process", but
>> also "last irq-level" as the context information, so I do think it
>> would be good to continue to do that.
>
> OK, so basically, extending printk_caller_id() so that for IRQ/NMI
> we will have more info than just "0x80000000 + raw_smp_processor_id()".
If bit31 is set, the upper 8 bits could specify what the lower 24 bits
represent. That would give some freedom for the future.
For example:
0x80 = cpu id (generic context)
0x81 = interrupt number
0x82 = cpu id (nmi context)
Or maybe ascii should be used instead?
0x80 | '\0' = cpu id (generic context)
0x80 | 'i' = interrupt number
0x80 | 'n' = cpu id (nmi context)
Just an idea.
John Ogness
next prev parent reply other threads:[~2020-07-21 14:57 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-17 23:48 [PATCH 0/4] printk: reimplement LOG_CONT handling John Ogness
2020-07-17 23:48 ` [PATCH 1/4] printk: ringbuffer: support dataless records John Ogness
2020-07-20 14:49 ` John Ogness
2020-07-17 23:48 ` [PATCH 2/4] printk: store instead of processing cont parts John Ogness
2020-07-19 14:35 ` Sergey Senozhatsky
2020-07-19 18:27 ` Linus Torvalds
2020-07-20 1:50 ` Sergey Senozhatsky
2020-07-20 18:30 ` Linus Torvalds
2020-07-21 3:53 ` Joe Perches
2020-07-21 14:42 ` Sergey Senozhatsky
2020-07-21 14:57 ` John Ogness [this message]
2020-07-29 2:03 ` Sergey Senozhatsky
2020-07-21 15:40 ` Linus Torvalds
2020-07-28 2:22 ` Sergey Senozhatsky
2020-07-17 23:48 ` [PATCH 3/4] printk: process cont records during reading John Ogness
2020-07-17 23:48 ` [PATCH 4/4] ipconfig: cleanup printk usage John Ogness
2020-07-18 0:00 ` [PATCH 0/4] printk: reimplement LOG_CONT handling Linus Torvalds
2020-07-18 14:42 ` John Ogness
2020-07-18 17:42 ` Linus Torvalds
2020-08-11 16:05 ` Petr Mladek
2020-08-12 16:39 ` POC: Alternative solution: " Petr Mladek
2020-08-13 0:24 ` John Ogness
2020-08-13 5:18 ` Sergey Senozhatsky
2020-08-13 7:44 ` John Ogness
2020-08-13 8:41 ` Petr Mladek
2020-08-13 10:29 ` John Ogness
2020-08-13 11:30 ` Petr Mladek
2020-08-14 3:34 ` Sergey Senozhatsky
2020-08-14 8:16 ` John Ogness
2020-08-14 9:12 ` Petr Mladek
2020-08-13 11:54 ` Sergey Senozhatsky
2020-08-14 9:04 ` Petr Mladek
2020-08-14 22:46 ` Linus Torvalds
2020-08-14 23:52 ` Joe Perches
2020-08-15 2:33 ` Linus Torvalds
2020-08-15 3:08 ` Joe Perches
2020-08-15 9:25 ` David Laight
2020-08-15 5:41 ` Sergey Senozhatsky
2020-08-13 7:51 ` Petr Mladek
2020-08-13 7:31 ` Petr Mladek
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