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Date: Tue, 13 Mar 2018 13:31:24 +0000
From: David Laight <David.Laight@...LAB.COM>
To: 'Linus Torvalds' <torvalds@...ux-foundation.org>, Kees Cook
<keescook@...omium.org>
CC: Andrew Morton <akpm@...ux-foundation.org>, Linux Kernel Mailing List
<linux-kernel@...r.kernel.org>, Josh Poimboeuf <jpoimboe@...hat.com>, "Rasmus
Villemoes" <linux@...musvillemoes.dk>, "Gustavo A. R. Silva"
<gustavo@...eddedor.com>, "Tobin C. Harding" <me@...in.cc>, Steven Rostedt
<rostedt@...dmis.org>, Jonathan Corbet <corbet@....net>, Chris Mason
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"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
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Shevchenko" <andriy.shevchenko@...ux.intel.com>, Pantelis Antoniou
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Network Development <netdev@...r.kernel.org>, Kernel Hardening
<kernel-hardening@...ts.openwall.com>
Subject: RE: [PATCH v3] kernel.h: Skip single-eval logic on literals in
min()/max()
The amount of replicated defined could also be reduced by passing > or <
to a min_max() macro.
So you start off with something like:
#define min(x, y) __min_max(x, <, y)
#define max(x, y) __min_max(x, >, y)
then have:
#define __min_max(x, cond, y) ((x) cond (y) ? (x) : (y))
in all its associated flavours.
David
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