From: Andrew Morton <akpm@linux-foundation.org>
To: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: David Rientjes <rientjes@google.com>,
Fengguang Wu <fengguang.wu@intel.com>,
Kees Cook <keescook@chromium.org>, Rik van Riel <riel@redhat.com>,
"linux-mm@kvack.org" <linux-mm@kvack.org>
Subject: Re: [patch -mm] mm, mempolicy: silence gcc warning
Date: Mon, 25 Nov 2013 12:31:08 -0800 [thread overview]
Message-ID: <20131125123108.79c80eb59c2b1bc41c879d9e@linux-foundation.org> (raw)
In-Reply-To: <CAHGf_=ooNHx=2HeUDGxrZFma-6YRvL42ViDMkSOqLOffk8MVsw@mail.gmail.com>
On Sat, 23 Nov 2013 15:49:08 -0500 KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> wrote:
> >> --- a/mm/mempolicy.c
> >> +++ b/mm/mempolicy.c
> >> @@ -2950,7 +2950,7 @@ void mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol)
> >> return;
> >> }
> >>
> >> - p += snprintf(p, maxlen, policy_modes[mode]);
> >> + p += snprintf(p, maxlen, "%s", policy_modes[mode]);
> >>
> >> if (flags & MPOL_MODE_FLAGS) {
> >> p += snprintf(p, buffer + maxlen - p, "=");
> >
> > mutter. There are no '%'s in policy_modes[]. Maybe we should only do
> > this #ifdef CONFIG_KEES.
> >
> > mpol_to_str() would be simpler (and slower) if it was switched to use
> > strncat().
>
> IMHO, you should queue this patch. mpol_to_str() is not fast path at all and
> I don't want worry about false positive warning.
Yup, it's in mainline.
> > It worries me that the CONFIG_NUMA=n version of mpol_to_str() doesn't
> > stick a '\0' into *buffer. Hopefully it never gets called...
>
> Don't worry. It never happens. Currently, all of caller depend on CONFIG_NUMA.
> However it would be nice if CONFIG_NUMA=n version of mpol_to_str() is
> implemented
> more carefully. I don't know who's mistake.
Put a BUG() in there?
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next prev parent reply other threads:[~2013-11-25 20:31 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-13 2:12 David Rientjes
2013-11-13 19:20 ` Kees Cook
2013-11-20 22:15 ` Andrew Morton
2013-11-20 22:19 ` Kees Cook
2013-11-23 20:49 ` KOSAKI Motohiro
2013-11-25 20:31 ` Andrew Morton [this message]
2013-11-25 23:30 ` David Rientjes
2013-11-25 23:33 ` [patch] mm, mempolicy: remove unneeded functions for UMA configs David Rientjes
2013-11-26 0:08 ` [patch -mm] mm, mempolicy: silence gcc warning KOSAKI Motohiro
2013-11-26 0:20 ` Andrew Morton
2013-11-26 18:40 ` KOSAKI Motohiro
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