linux-kernel - Re: [PATCH] scripts/decode_stacktrace: warn when modpath is needed but is unset

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Message-ID: <20200615232453.GF1931@sasha-vm>
Date:   Mon, 15 Jun 2020 19:24:53 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Shuah Khan <skhan@...uxfoundation.org>,
        Konstantin Khlebnikov <koct9i@...il.com>,
        Joerg Roedel <jroedel@...e.de>,
        Andrew Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Takashi Iwai <tiwai@...e.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        the arch/x86 maintainers <x86@...nel.org>
Subject: Re: [PATCH] scripts/decode_stacktrace: warn when modpath is needed
 but is unset

On Mon, Jun 15, 2020 at 03:43:31PM -0700, Linus Torvalds wrote:
>On Mon, Jun 15, 2020 at 3:37 PM Linus Torvalds
><torvalds@...ux-foundation.org> wrote:
>>
>> Well, that looks straightforward.
>
>Hmm. Decided to test it. It warns for every case: a bit excessive,
>perhaps, but I guess it won't hurt.
>
>So Shuah's thing results in
>
>[    9.791367] Call Trace:
>WARNING! Modules path isn't set, but is needed to parse this symbol
>[    9.791377] ? snd_pcm_hw_params+0x3ca/0x440 snd_pcm
>WARNING! Modules path isn't set, but is needed to parse this symbol
>[    9.791383] snd_pcm_common_ioctl+0x173/0xf20 snd_pcm
>WARNING! Modules path isn't set, but is needed to parse this symbol
>[    9.791389] ? snd_ctl_ioctl+0x1c5/0x710 snd
>WARNING! Modules path isn't set, but is needed to parse this symbol
>[    9.791394] snd_pcm_ioctl+0x27/0x40 snd_pcm
>
>which looks a bit redundant, but maybe that just means people _really_ notice.

I figured it's a good balance between warning only once (which can get
lost in a longer trace) vs just exiting on error (as it prevents the
user from ignoring this issue if he doesn't care or just doesn't have
the modules).

-- 
Thanks,
Sasha