linux-kernel - Re: [RFC[ Alloc in vsprintf

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Message-ID: <CAHk-=wi4snadB1LiV=FAUTpHNumsF=GN=U5vckWaLMbnU5nfQA@mail.gmail.com>
Date:   Sun, 26 Jun 2022 13:54:28 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Joe Perches <joe@...ches.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        David Laight <David.Laight@...lab.com>,
        Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Matthew Wilcox <willy@...radead.org>,
        Miguel Ojeda <ojeda@...nel.org>,
        Kent Overstreet <kent.overstreet@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>
Subject: Re: [RFC[ Alloc in vsprintf

On Sun, Jun 26, 2022 at 1:39 PM Joe Perches <joe@...ches.com> wrote:
>
> OK, and that's true for all the temp stack buffers in every %p<foo>.

Yup.

A lot of them are simply due to it just being simple, and when the
temp buffer is of a fairly limited size, "simple is good".

But yeah, that KSYM_SYMBOL_LEN thing was questionable before, and as
it grows with KSYM_NAME_LEN growing, it's getting pretty ridiculous.

For example, the buffer in "number()" looks very reasonable to me,
since it's not only pretty small (24 bytes on 64-bit architectures).
it has that special alignment requirement too.

So I don't think those temporary stack buffers are necessarily wrong
in general, but there's a point where they go from "ok, there's being
_simple_ and then there's _overly_simplistic_".

                   Linus