linux-kernel - Re: [PATCH v3 1/2] modpost: rework and consolidate logging interface

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Date:   Mon, 9 Mar 2020 10:59:14 +0100
From:   Jessica Yu <jeyu@...nel.org>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     Matthias Maennich <maennich@...gle.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 1/2] modpost: rework and consolidate logging interface

+++ Masahiro Yamada [09/03/20 09:40 +0900]:
>Hi Jessica,
>
>
>
>On Sat, Mar 7, 2020 at 1:02 AM Jessica Yu <jeyu@...nel.org> wrote:
>>
>> Rework modpost's logging interface by consolidating merror(), warn(), and
>> fatal() to use a single function, modpost_log(). Introduce different
>> logging levels (WARN, ERROR, FATAL) as well. The purpose of this cleanup is
>> to reduce code duplication when deciding whether or not to warn or error
>> out based on a condition.
>>
>> Signed-off-by: Jessica Yu <jeyu@...nel.org>
>> ---
>> v3:
>>         - remove level variable from modpost_log and just call fprintf in each
>>           case
>>         - remove warn_unless and just call modpost_log() directly
>>         - fix checkpatch error:
>>                 ERROR: space required before the open parenthesis '('
>>         #102: FILE: scripts/mod/modpost.c:61:
>>         + switch(loglevel) {
>>
>>  scripts/mod/modpost.c | 68 ++++++++++++++++++++++-----------------------------
>>  scripts/mod/modpost.h | 14 ++++++++---
>>  2 files changed, 40 insertions(+), 42 deletions(-)
>>
>> diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
>> index 7edfdb2f4497..a2329235a6db 100644
>> --- a/scripts/mod/modpost.c
>> +++ b/scripts/mod/modpost.c
>> @@ -51,41 +51,34 @@ enum export {
>>
>>  #define MODULE_NAME_LEN (64 - sizeof(Elf_Addr))
>>
>> -#define PRINTF __attribute__ ((format (printf, 1, 2)))
>> +#define PRINTF __attribute__ ((format (printf, 2, 3)))
>>
>> -PRINTF void fatal(const char *fmt, ...)
>> +PRINTF void modpost_log(enum loglevel loglevel, const char *fmt, ...)
>>  {
>
>
>This series looks good to me.
>
>I can queue it up to kbuild tree
>if there is no objection.
>
>
>I just noticed one nit.
>
>Now that modpost_log() is the only user of PRINTF,
>we can delete PRITNF, and directly add the attribute
>to modpost_log(), like this:
>
>
>void __attribute__((format(printf, 2, 3)))
>modpost_log(enum loglevel loglevel, const char *fmt, ...)
>{
>       ...
>}
>
>
>If you agree, I can modify it when I apply it.

Yes, I agree with this change. Thank you!

One more thing, it's not immediately obvious to me why the first patch
would cause those kbuild warnings :-/ I'll see if I have any luck
reproducing them locally..

Thanks,

Jessica