From: Joe Perches <joe@perches.com>
To: Petr Mladek <pmladek@suse.com>,
Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, Dmitry Vyukov <dvyukov@google.com>,
Ondrej Mosnacek <omosnace@redhat.com>,
Steven Rostedt <rostedt@goodmis.org>
Subject: Re: [PATCH] twist: allow converting pr_devel()/pr_debug() into printk(KERN_DEBUG)
Date: Thu, 28 May 2020 10:08:18 -0700 [thread overview]
Message-ID: <a4f8cfc41d4b7f9f76a403767cfc28d5ffafc1ee.camel@perches.com> (raw)
In-Reply-To: <20200528121455.GD11286@linux-b0ei>
On Thu, 2020-05-28 at 14:14 +0200, Petr Mladek wrote:
> On Thu 2020-05-28 20:33:10, Tetsuo Handa wrote:
> > On 2020/05/28 19:59, Petr Mladek wrote:
> > > 2. Add twist into vprintk_store(). In the current, implementation
> > > it would do:
> > >
> > > #if TWIST
> > > return text_len;
> > > #endif
> > >
> > > return log_output(facility, level, lflags,
> > > dict, dictlen, text, text_len);
> >
> > This part could be possible. But
> >
> > > 1. Add twist into ddebug_add_module() and enable all newly added
> > > entries by default. For example, by calling
> > > ddebug_exec_query("*:+p", const char *modname) or what is the syntax.
> > >
> > > This will cause that any pr_devel() variant will always get called.
> >
> > how to handle
> >
> > > > #define no_printk(fmt, ...) \
> > > > ({ \
> > > > if (0) \
> > > > printk(fmt, ##__VA_ARGS__); \
> > > > 0; \
> > > > })
> >
> > part used by e.g. pr_devel() ? Since this macro is not using dynamic debug
> > interface, vprintk_store() will not be called from the beginning. Are you
> > suggesting that we should convert no_printk() to use dynamic debug interface ?
>
> OK, this is one more path that would need special handling. Two paths
> are much better than 15.
A few more:
$ grep-2.5.4 --include=*.[ch] -rP '\if\s*\(\s*0\s*\)\s*\{?\s*\\?\s*no_printk' *
drivers/platform/x86/thinkpad_acpi.c: do { if (0) no_printk(format, ##arg); } while (0)
fs/ntfs/debug.h: if (0) \
no_printk(fmt, ##__VA_ARGS__); \
include/linux/net.h: if (0) \
no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); \
kernel/cred.c: if (0) \
no_printk("[%-5.5s%5u] " FMT "\n", \
next prev parent reply other threads:[~2020-05-28 17:08 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-24 14:50 [PATCH] twist: allow converting pr_devel()/pr_debug() into printk(KERN_DEBUG) Tetsuo Handa
2020-05-24 17:38 ` Joe Perches
2020-05-24 19:18 ` Ondrej Mosnacek
2020-05-25 5:03 ` Tetsuo Handa
2020-05-25 6:07 ` Joe Perches
2020-05-25 7:38 ` Dmitry Vyukov
2020-05-25 8:42 ` Petr Mladek
2020-05-25 9:11 ` Sergey Senozhatsky
2020-05-25 10:43 ` Tetsuo Handa
2020-05-27 8:37 ` Petr Mladek
2020-05-27 10:13 ` Tetsuo Handa
2020-05-27 15:55 ` Petr Mladek
2020-05-27 23:33 ` Tetsuo Handa
2020-05-28 6:56 ` [PATCH v2] twist: allow converting pr_devel()/pr_debug() into snprintf() Tetsuo Handa
2020-05-28 11:06 ` Petr Mladek
2020-05-28 15:16 ` Tetsuo Handa
2020-05-28 19:10 ` Andrew Morton
2020-05-28 19:50 ` Linus Torvalds
2020-05-28 20:01 ` Linus Torvalds
2020-05-29 0:07 ` Tetsuo Handa
2020-05-29 0:28 ` Linus Torvalds
2020-05-29 2:13 ` Tetsuo Handa
2020-05-29 2:24 ` Linus Torvalds
2020-05-29 4:47 ` Tetsuo Handa
2020-05-29 13:26 ` Tetsuo Handa
2020-06-03 11:03 ` twist: allow disabling reboot request Tetsuo Handa
2020-06-03 12:44 ` Petr Mladek
2020-06-03 13:35 ` Tetsuo Handa
2020-06-04 10:21 ` Petr Mladek
2020-06-08 7:48 ` [PATCH v2] twist: allow converting pr_devel()/pr_debug() into snprintf() Dmitry Vyukov
2020-06-08 10:30 ` Tetsuo Handa
2020-06-08 11:31 ` Andrey Konovalov
2020-05-29 8:17 ` Petr Mladek
2020-06-08 16:39 ` Geert Uytterhoeven
2020-05-28 10:59 ` [PATCH] twist: allow converting pr_devel()/pr_debug() into printk(KERN_DEBUG) Petr Mladek
2020-05-28 11:33 ` Tetsuo Handa
2020-05-28 12:14 ` Petr Mladek
2020-05-28 14:13 ` Tetsuo Handa
2020-05-28 17:08 ` Joe Perches [this message]
2020-05-29 2:04 ` Sergey Senozhatsky
2020-05-29 5:06 ` Tetsuo Handa
2020-05-27 9:59 ` kbuild test robot
2020-05-27 13:41 ` Tetsuo Handa
2020-05-27 12:37 ` kbuild test robot
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