linux-kernel - Re: [PATCH 5/7] printk: Make %pS and friends print module build ID

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Message-ID: <161491807864.1478170.14069558494579871831@swboyd.mtv.corp.google.com>
Date:   Thu, 04 Mar 2021 20:21:18 -0800
From:   Stephen Boyd <swboyd@...omium.org>
To:     Matthew Wilcox <willy@...radead.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, Jiri Olsa <jolsa@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Jessica Yu <jeyu@...nel.org>,
        Evan Green <evgreen@...omium.org>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-doc@...r.kernel.org
Subject: Re: [PATCH 5/7] printk: Make %pS and friends print module build ID

Quoting Rasmus Villemoes (2021-03-04 15:11:47)
> On 04/03/2021 20.15, Stephen Boyd wrote:
> > Quoting Matthew Wilcox (2021-03-04 09:00:52)
> >> On Mon, Mar 01, 2021 at 09:47:47AM -0800, Stephen Boyd wrote:
> >>> Example:
> >>>
> >>>  WARNING: CPU: 4 PID: 3255 at drivers/misc/lkdtm/bugs.c:83 lkdtm_WARNING+0x28/0x30 [lkdtm] (ed5019fdf5e53be37cb1ba7899292d7e143b259e)
> >>
> >> Would the first 12 characters instead of all 40 make it more palatable
> >> without reducing its utility?
> > 
> > I can't seem to request debuginfo from debuginfod without the full 40
> > characters. It's not a git sha1 hash. 
> > 
> >> And I feel it should be within the [], so maybe this:
> >>
> >> WARNING: CPU: 4 PID: 3255 at drivers/misc/lkdtm/bugs.c:83 lkdtm_WARNING+0x28/0x30 [lkdtm ed5019fdf5e5]
> >>
> > 
> > Sure I could put the hex numbers inside the brackets. I suspect changing
> > %pS or updating the "Modules linked in:" line isn't going to be
> > palatable. I've decided to introduce another printk format %pT to print
> > the stacktrace 
> 
> Can you avoid claiming a new "top-level" %p modifier? Isn't it better to
> add a new flag to '%pS', say '%pSb' to include build-id?
> 

I see that %pSR is used in alpha for the stacktrace. I guess we can have
%pSb and %pSr then.