linux-kernel - [PATCH v4] cpumask: add cpumask_var

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Message-Id: <20110429005435.C90F.A69D9226@jp.fujitsu.com>
Date:	Fri, 29 Apr 2011 00:52:54 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Thiago Farina <tfransosi@...il.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH v4] cpumask: add cpumask_var_t documentation

> > + * This code makes NR_CPUS length memcopy and bring memory corruption.
> 
> Maybe:
> 
> s/bring memory/brings to a memory/
> 
> ?
> 
> > + * cpumask_copy() privide safe copy functionality.
> s/privide/provides ?


Thank you.



>From 28549f1a51072a58bd661a409e378e36a97072a3 Mon Sep 17 00:00:00 2001
From: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Date: Tue, 26 Apr 2011 19:58:39 +0900
Subject: [PATCH v4] cpumask: add cpumask_var_t documentation

cpumask_var_t has one nortable difference against cpumask_t.
This patch adds the explanation.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
---
 include/linux/cpumask.h |   14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
index 1e40dd0..8fcd82c 100644
--- a/include/linux/cpumask.h
+++ b/include/linux/cpumask.h
@@ -617,6 +617,20 @@ static inline size_t cpumask_size(void)
  *	  ... use 'tmpmask' like a normal struct cpumask * ...
  *
  *	free_cpumask_var(tmpmask);
+ *
+ *
+ * However, one notable exception is there. alloc_cpumask_var() allocates
+ * only nr_cpumask_bits bits (in the other hand, real cpumask_t always has
+ * NR_CPUS bits). Therefore you don't have to dereference cpumask_var_t.
+ *
+ *	cpumask_var_t tmpmask;
+ *	if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL))
+ *		return -ENOMEM;
+ *
+ *	var = *tmpmask;
+ *
+ * This code makes NR_CPUS length memcopy and brings to a memory corruption.
+ * cpumask_copy() provide safe copy functionality.
  */
 #ifdef CONFIG_CPUMASK_OFFSTACK
 typedef struct cpumask *cpumask_var_t;
-- 
1.7.3.1



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