From: Joe Perches <joe@perches.com>
To: Viresh Kumar <viresh.kumar@linaro.org>
Cc: yalin wang <yalin.wang2010@gmail.com>,
"Kirill A. Shutemov" <kirill@shutemov.name>,
Andrew Morton <akpm@linux-foundation.org>,
linaro-kernel@lists.linaro.org,
open list <linux-kernel@vger.kernel.org>,
"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
David Rientjes <rientjes@google.com>,
Ebru Akagunduz <ebru.akagunduz@gmail.com>,
Johannes Weiner <hannes@cmpxchg.org>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
"open list:MEMORY MANAGEMENT" <linux-mm@kvack.org>,
Mel Gorman <mgorman@suse.de>, Michal Hocko <mhocko@suse.cz>,
Vlastimil Babka <vbabka@suse.cz>
Subject: Re: [PATCH 14/15] mm: Drop unlikely before IS_ERR(_OR_NULL)
Date: Fri, 31 Jul 2015 11:00:22 -0700 [thread overview]
Message-ID: <1438365622.19675.97.camel@perches.com> (raw)
In-Reply-To: <20150731110637.GB899@linux>
On Fri, 2015-07-31 at 16:36 +0530, Viresh Kumar wrote:
> On 31-07-15, 03:28, Joe Perches wrote:
> > If it's all fixed, then it's unlikely to be needed in checkpatch.
>
> I thought checkpatch is more about not committing new mistakes, rather than
> finding them in old code.
True, but checkpatch is more about style than substance.
There are a lot of things that _could_ be added to the script
but don't have to be because of relative rarity.
The unanswered fundamental though is whether the unlikely use
in #define IS_ERR_VALUE is useful.
include/linux/err.h:21:#define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO)
How often does using unlikely here make the code smaller/faster
with more recent compilers than gcc 3.4? Or even using gcc 3.4.
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next prev parent reply other threads:[~2015-07-31 18:00 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <cover.1438331416.git.viresh.kumar@linaro.org>
2015-07-31 8:38 ` [PATCH 14/15] mm: Drop unlikely before IS_ERR(_OR_NULL) Viresh Kumar
2015-07-31 8:56 ` Kirill A. Shutemov
2015-07-31 9:32 ` yalin wang
2015-07-31 9:34 ` Viresh Kumar
2015-07-31 10:28 ` Joe Perches
2015-07-31 11:06 ` Viresh Kumar
2015-07-31 18:00 ` Joe Perches [this message]
2015-08-01 11:18 ` Viresh Kumar
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