linux-kernel - Re: [PATCH v6 3/4] printk: Userspace format indexing support

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Date:   Tue, 18 May 2021 17:59:23 +0100
From:   Chris Down <chris@...isdown.name>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org, Petr Mladek <pmladek@...e.com>,
        Jessica Yu <jeyu@...nel.org>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        John Ogness <john.ogness@...utronix.de>,
        Steven Rostedt <rostedt@...dmis.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Kees Cook <keescook@...omium.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>, kernel-team@...com
Subject: Re: [PATCH v6 3/4] printk: Userspace format indexing support

Chris Down writes:
>Andy Shevchenko writes:
>>>As for the literals, are you saying that you prefer that it's symbolised as
>>>a macro or static char, or do you know of an API where this kind of name can
>>>be canonically accessed?
>>
>>I have heard that modern GCC (at least) can utilize same constant literals in a
>>single compilation unit, so it won't be duplicated.
>>
>>But more serious here is the guarantees of the name. Shouldn't it come from
>>KBuild / Makefile into some header like version do?
>
>I'm not against that, but it seems like something worth doing outside 
>of this patch series, unless you have strong feelings to the contrary?
>
>More than happy to put that on my TODO list for tree-wide cleanups.

Now I think about it, we even just call it that in struct module's is_vmlinux, 
and set that by doing `strcmp(modname, "vmlinux") == 0`, so it seems pretty 
static from a terminology point of view.

It would be nice to just always use `mod->name`, but unfortunately with 
!CONFIG_MODULES we don't have `struct module` fleshed out at all in order to do 
so.