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Date: Thu, 08 Mar 2018 21:59:11 +0000
From: Ian Campbell <ijc@...lion.org.uk>
To: Kees Cook <keescook@...omium.org>, Andrew Morton
<akpm@...ux-foundation.org>
Cc: Josh Poimboeuf <jpoimboe@...hat.com>, Rasmus Villemoes
<linux@...musvillemoes.dk>, "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
"Tobin C. Harding" <me@...in.cc>, rostedt@...dmis.org, corbet@....net,
Chris Mason <clm@...com>, Josef Bacik <jbacik@...com>, David Sterba
<dsterba@...e.com>, "David S. Miller" <davem@...emloft.net>, Alexey
Kuznetsov <kuznet@....inr.ac.ru>, Hideaki YOSHIFUJI
<yoshfuji@...ux-ipv6.org>, Ingo Molnar <mingo@...nel.org>, Peter Zijlstra
<peterz@...radead.org>, Thomas Gleixner <tglx@...utronix.de>, Masahiro
Yamada <yamada.masahiro@...ionext.com>, Borislav Petkov <bp@...e.de>, Randy
Dunlap <rdunlap@...radead.org>, Ian Abbott <abbotti@....co.uk>, Sergey
Senozhatsky <sergey.senozhatsky.work@...il.com>, Petr Mladek
<pmladek@...e.com>, Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
linux-btrfs@...r.kernel.org, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org, kernel-hardening@...ts.openwall.com
Subject: Re: [PATCH] kernel.h: Skip single-eval logic on literals in
min()/max()
On Thu, 2018-03-08 at 13:40 -0800, Kees Cook wrote:
>
> +#define __min(t1, t2, x, y) \
> + __builtin_choose_expr(__builtin_constant_p(x) && \
> + __builtin_constant_p(y) && \
> + __builtin_types_compatible_p(t1, t2), \
> + (t1)(x) < (t2)(y) ? (t1)(x) : (t2)(y), \
> + __single_eval_min(t1, t2, \
> + __UNIQUE_ID(max1_), \
> + __UNIQUE_ID(max2_), \
min1_ etc?
Ian.
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