linux-kernel - [PATCH v2 1/3] libkmod: add a library notice log level print

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Date:   Mon,  9 Aug 2021 22:16:00 -0700
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     lucas.demarchi@...el.com, linux-modules@...r.kernel.org
Cc:     live-patching@...r.kernel.org, fstests@...r.kernel.org,
        linux-block@...r.kernel.org, hare@...e.de, dgilbert@...erlog.com,
        jeyu@...nel.org, osandov@...com, linux-kernel@...r.kernel.org,
        Luis Chamberlain <mcgrof@...nel.org>
Subject: [PATCH v2 1/3] libkmod: add a library notice log level print

When you use pass the -v argument to modprobe we bump
the log level from the default modprobe log level of
LOG_WARNING (4) to LOG_NOTICE (5), however the library
only has avaiable to print:

 #define DBG(ctx, arg...) kmod_log_cond(ctx, LOG_DEBUG, ## arg)
 #define INFO(ctx, arg...) kmod_log_cond(ctx, LOG_INFO, ## arg)
 #define ERR(ctx, arg...) kmod_log_cond(ctx, LOG_ERR, ## arg)

LOG_INFO (6) however is too high of a level for it to be
effective at printing anything when modprobe -v is passed.
And so the only way in which modprobe -v can trigger the
library to print a verbose message is to use ERR() but that
always prints something and we don't want that in some
situations.

We need to add a new log level macro which uses LOG_NOTICE (5)
for a "normal but significant condition" which users and developers
can use to look underneath the hood to confirm if a situation is
happening.

Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>
---
 libkmod/libkmod-internal.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libkmod/libkmod-internal.h b/libkmod/libkmod-internal.h
index 398af9c..2e5e1bc 100644
--- a/libkmod/libkmod-internal.h
+++ b/libkmod/libkmod-internal.h
@@ -25,10 +25,12 @@ static _always_inline_ _printf_format_(2, 3) void
 #  else
 #    define DBG(ctx, arg...) kmod_log_null(ctx, ## arg)
 #  endif
+#  define NOTICE(ctx, arg...) kmod_log_cond(ctx, LOG_NOTICE, ## arg)
 #  define INFO(ctx, arg...) kmod_log_cond(ctx, LOG_INFO, ## arg)
 #  define ERR(ctx, arg...) kmod_log_cond(ctx, LOG_ERR, ## arg)
 #else
 #  define DBG(ctx, arg...) kmod_log_null(ctx, ## arg)
+#  define NOTICE(ctx, arg...) kmod_log_cond(ctx, LOG_NOTICE, ## arg)
 #  define INFO(ctx, arg...) kmod_log_null(ctx, ## arg)
 #  define ERR(ctx, arg...) kmod_log_null(ctx, ## arg)
 #endif
-- 
2.30.2