linux-kernel - [PATCH 0/4] use BUG

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Message-Id: <1301160415-24569-1-git-send-email-bosong.ly@taobao.com>
Date:	Sun, 27 Mar 2011 01:26:51 +0800
From:	Coly Li <bosong.ly@...bao.com>
To:	linux-kernel@...r.kernel.org
Cc:	Coly Li <bosong.ly@...bao.com>, Greg KH <gregkh@...e.de>,
	Yong Zhang <yong.zhang0@...il.com>,
	Wang Cong <xiyou.wangcong@...il.com>
Subject: [PATCH 0/4] use BUG_ON correctly, v4

Most of BUG_ON() implementations use unlikely() internally for better
branch prediction results. The following method to use BUG_ON() with
an explicit unlikely() doesn't make things better and is unwelcome:
	BUG_ON(unlikely(condition));
Source code should use BUG_ON() just with condition code.

For arch implementation of BUG_ON(), there are feed backs for v2 patch
set from MIPS and PowerPC developers than neither explicit no implicit
unlikely() does help anything.

Therefore using unlikely() explicit with BUG_ON() is always a bug. This
patch set removes all incorrect BUG_ON() usage.

Patch "Staging: wl_cfg80211.c: use BUG_ON correctly" is merged into
upstream (commit d7ddd169), no longer in v4 patch set. For v4 
patch set, proper maintainers are added into Cc list by the help of
scripts/get_maintainer.pl.

Cc: Greg KH <gregkh@...e.de>
Cc: Yong Zhang <yong.zhang0@...il.com>
Cc: Wang Cong <xiyou.wangcong@...il.com>
Signed-off-by: Coly Li <bosong.ly@...bao.com>
---
 drivers/dma/iop-adma.c    |    6 +++---
 drivers/dma/mv_xor.c      |    6 +++---
 drivers/dma/ppc4xx/adma.c |    8 ++++----
 drivers/scsi/scsi_lib.c   |    4 ++--
 4 files changed, 12 insertions(+), 12 deletions(-)
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