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Date: Fri, 24 May 2019 17:56:31 -0700 From: Joe Perches <joe@...ches.com> To: Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>, Linus Torvalds <torvalds@...ux-foundation.org> Cc: Andrew Morton <akpm@...ux-foundation.org>, Linux List Kernel Mailing <linux-kernel@...r.kernel.org>, Dmitry Vyukov <dvyukov@...gle.com>, Petr Mladek <pmladek@...e.com>, Sergey Senozhatsky <sergey.senozhatsky.work@...il.com> Subject: Re: [PATCH] printk: Monitor change of console loglevel. On Sat, 2019-05-25 at 09:14 +0900, Tetsuo Handa wrote: > On 2019/05/25 2:17, Linus Torvalds wrote: > > A config option or two that help syzbot doesn't sound like a bad idea to me. > > Thanks for suggestion. I think that #ifdef'ing > > static bool suppress_message_printing(int level) > { > return (level >= console_loglevel && !ignore_loglevel); > } > > is simpler. [] > On 2019/05/25 2:55, Linus Torvalds wrote: > > On Fri, May 24, 2019 at 10:41 AM Joe Perches <joe@...ches.com> wrote: > > > That could also help eliminate unnecessary pr_<foo> output > > > from object code. > > > > Indeed. The small-config people might like it (if they haven't already > > given up..) > > Do you mean doing e.g. > > #define pr_debug(fmt, ...) no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) > > depending on the minimal console loglevel kernel config option? Then, OK. Yes. Perhaps something like the below (or an equivalent generic wrapper) #define pr_info(fmt, ...) \ do { \ if (CONFIG_STATIC_CONSOLE_LEVEL >= LOGLEVEL_INFO) \ printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__); \ else \ no_printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__); \ } while (0) for each pr_<level>, dev_<level> and netdev_<level>
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