linux-kernel - Re: [PATCH 1/2] cpusets: restructure the function update_cpumask() and update

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Date:	Wed, 02 Jul 2008 17:54:59 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	miaox@...fujitsu.com, Linux-Kernel <linux-kernel@...r.kernel.org>,
	Paul Jackson <pj@....com>, Paul Menage <menage@...gle.com>
Subject: Re: [PATCH 1/2] cpusets: restructure the function update_cpumask()
 and update_nodemask()

>> kernel/cpuset.c: In function 'cpuset_write_resmask':
>> kernel/cpuset.c:1374: warning: passing argument 2 of 'update_nodemask' discards qualifiers from pointer target type
>>
>> Did you not get this warning also?
>>
>> I don't know how to fix it.  cftype.write_string() requires a const
>> char* in the third arg, but we then go on to call update_nodemask(),
>> which does a strstrip() on this allegedly-const char array.
>>
> 
> That strstrip() should be removed. because cgroup_write_string() already strstrip()ed
> the buffer. Paul M's original patch removed that 2 strstrip()s in cpuset.c.
> 

Here is the patch:

--- linux-2.6.26-rc7/kernel/cpuset.c.bak	2008-07-02 17:53:07.000000000 +0800
+++ linux-2.6.26-rc7/kernel/cpuset.c	2008-07-02 17:53:23.000000000 +0800
@@ -1011,7 +1011,7 @@ done:
  * lock each such tasks mm->mmap_sem, scan its vma's and rebind
  * their mempolicies to the cpusets new mems_allowed.
  */
-static int update_nodemask(struct cpuset *cs, char *buf)
+static int update_nodemask(struct cpuset *cs, const char *buf)
 {
 	struct cpuset trialcs;
 	nodemask_t oldmem;
@@ -1032,7 +1032,6 @@ static int update_nodemask(struct cpuset
 	 * that parsing.  The validate_change() call ensures that cpusets
 	 * with tasks have memory.
 	 */
-	buf = strstrip(buf);
 	if (!*buf) {
 		nodes_clear(trialcs.mems_allowed);
 	} else {


>> Taking a copy of the string in update_nodemask() would fix things, but
>> that's pretty lame.
>>
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