From: Andrew Morton <akpm@linux-foundation.org>
To: Yang Shi <yang.shi@linux.alibaba.com>
Cc: David Hildenbrand <david@redhat.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/2] mm: vmpressure: don't need call kfree if kstrndup fails
Date: Wed, 12 Feb 2020 20:48:27 -0800 [thread overview]
Message-ID: <20200212204827.df1de9015a3c03c79a8d7155@linux-foundation.org> (raw)
In-Reply-To: <48d53caf-4b89-69c3-cf9b-47b8627db0bd@linux.alibaba.com>
On Wed, 12 Feb 2020 19:14:27 -0800 Yang Shi <yang.shi@linux.alibaba.com> wrote:
> On 2/12/20 3:21 AM, David Hildenbrand wrote:
> > On 11.02.20 06:24, Yang Shi wrote:
> >> When kstrndup fails (returns NULL) there is no memory is allocated by
> >> kmalloc, so no need to call kfree().
> > "When kstrndup fails, no memory was allocated and we can exit directly."
>
> Thanks for correcting the commit log.
>
> Andrew, do you prefer I send an updated version or you would just update
> the patch in -mm tree?
I have already done this.
From: Yang Shi <yang.shi@linux.alibaba.com>
Subject: mm: vmpressure: don't need call kfree if kstrndup fails
When kstrndup fails, no memory was allocated and we can exit directly.
[david@redhat.com: reword changelog]
Link: http://lkml.kernel.org/r/1581398649-125989-1-git-send-email-yang.shi@linux.alibaba.com
Signed-off-by: Yang Shi <yang.shi@linux.alibaba.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/vmpressure.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
--- a/mm/vmpressure.c~mm-vmpressure-dont-need-call-kfree-if-kstrndup-fails
+++ a/mm/vmpressure.c
@@ -371,10 +371,8 @@ int vmpressure_register_event(struct mem
int ret = 0;
spec_orig = spec = kstrndup(args, MAX_VMPRESSURE_ARGS_LEN, GFP_KERNEL);
- if (!spec) {
- ret = -ENOMEM;
- goto out;
- }
+ if (!spec)
+ return -ENOMEM;
/* Find required level */
token = strsep(&spec, ",");
_
next prev parent reply other threads:[~2020-02-13 4:48 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-11 5:24 [PATCH 1/2] mm: vmpressure: don't need call kfree if kstrndup fails Yang Shi
2020-02-11 5:24 ` [PATCH 2/2] mm: vmpressure: use mem_cgroup_is_root API Yang Shi
2020-02-12 2:08 ` David Rientjes
2020-02-12 8:23 ` Michal Hocko
2020-02-13 3:18 ` Yang Shi
2020-02-12 11:19 ` David Hildenbrand
2020-02-12 2:07 ` [PATCH 1/2] mm: vmpressure: don't need call kfree if kstrndup fails David Rientjes
2020-02-12 11:21 ` David Hildenbrand
2020-02-13 3:14 ` Yang Shi
2020-02-13 4:48 ` Andrew Morton [this message]
2020-02-13 4:51 ` Yang Shi
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