linux-kernel - [PATCH v5 0/9] Cleanup & new features for compiler*.h and bug.h

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Date:	Tue, 13 Nov 2012 16:09:19 -0600
From:	danielfsantos@....net
To:	LKML <linux-kernel@...r.kernel.org>,
	Andi Kleen <ak@...ux.intel.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christopher Li <sparse@...isli.org>,
	Daniel Santos <daniel.santos@...ox.com>,
	David Daney <david.daney@...ium.com>,
	David Howells <dhowells@...hat.com>,
	Joe Perches <joe@...ches.com>,
	Josh Triplett <josh@...htriplett.org>,
	Konstantin Khlebnikov <khlebnikov@...nvz.org>,
	linux-sparse@...r.kernel.org,
	Michel Lespinasse <walken@...gle.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Pavel Pisa <pisa@....felk.cvut.cz>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: [PATCH v5 0/9] Cleanup & new features for compiler*.h and bug.h

 include/linux/bug.h           |   47 ++++++++++++++++++++++------------------
 include/linux/compiler-gcc.h  |    3 ++
 include/linux/compiler-gcc3.h |    8 +++---
 include/linux/compiler-gcc4.h |   28 ++++++++++++------------
 include/linux/compiler.h      |   32 +++++++++++++++++++++++++--
 5 files changed, 76 insertions(+), 42 deletions(-)

Changes in v5:
o Move BUILD_BUG* guts to a new compiletime_assert() macro in compiler.h.
o Fix a double-evaluation problem.
o Fix another bad macro definition when __CHECKER__ defined.

Changes in v4:
o Squash a minor commit (per Borislav Petkov)
o Change some comment text (per Borislav Petkov)
o Add some acks

This patch set is a dependency of the generic red-black tree patch set, which
I have now split up into three smaller sets and is based off of linux-next.

The major aim of this patch set is to cleanup compiler-gcc*.h and improve
the manageability of of compiler features at various versions (when they
are broken, etc.), add some needed features to bug.h and clean that up as
well.

compiler-gcc*.h
o Introduce GCC_VERSION - (e.g., gcc 4.7.1 becomes 40701).
o Reorder all features based upon the version introduced (readability).
o Change all version checks to use GCC_VERSION.
o Remove redundant __linktime_error macro.
o Introduce compiletime_assert() macro.

bug.h
o Improve BUILD_BUG_ON(expr) - now generates compile-time error post-gcc-4.4
o Remove duplicate error messages in some cases.
o Fix double-evaluation problem in BUILD_BUG_ON.
o Fix bad macro definitions when using __CHECKER__.
o Introduce BUILD_BUG_ON_MSG and clean up the implementations of the
  BUILD_BUG* macros.
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