linux-kernel - Re: [PATCHv7 5/8] printk: report lost messages in printk safe/nmi contexts

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Message-ID: <20170104144608.GS14894@pathway.suse.cz>
Date:   Wed, 4 Jan 2017 15:46:08 +0100
From:   Petr Mladek <pmladek@...e.com>
To:     Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Jan Kara <jack@...e.cz>, Tejun Heo <tj@...nel.org>,
        Calvin Owens <calvinowens@...com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Hurley <peter@...leysoftware.com>,
        linux-kernel@...r.kernel.org,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Subject: Re: [PATCHv7 5/8] printk: report lost messages in printk safe/nmi
 contexts

On Tue 2016-12-27 23:16:08, Sergey Senozhatsky wrote:
> Account lost messages in pritk-safe and printk-safe-nmi
> contexts and report those numbers during printk_safe_flush().
> 
> The patch also moves lost message counter to struct
> `printk_safe_seq_buf' instead of having dedicated static
> counters - this simplifies the code.
> 
> Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>

I like that the handling is localized in printk_safe.c and that
the warning is printed right after the messages that fit the buffer.

Reviewed-by: Petr Mladek <pmladek@...e.com>

Best Regards,
Petr