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Tue, 25 Apr 2023 21:07:01 -0700 (PDT) Message-ID: Date: Wed, 26 Apr 2023 12:06:56 +0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:102.0) Gecko/20100101 Thunderbird/102.9.1 Subject: Re: [PATCH 01/34] maple_tree: Fix static analyser cppcheck issue To: "Liam R. Howlett" Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, maple-tree@lists.infradead.org, David Binderman , Andrew Morton References: <20230425140955.3834476-1-Liam.Howlett@oracle.com> <20230425140955.3834476-2-Liam.Howlett@oracle.com> From: Peng Zhang In-Reply-To: <20230425140955.3834476-2-Liam.Howlett@oracle.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam03 X-Stat-Signature: k6awrnuzbaahwjeeatuxzmx974xfxu7s X-Rspamd-Queue-Id: 5B2431A0006 X-HE-Tag: 1682482023-500781 X-HE-Meta: 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 li8N8vEc 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 在 2023/4/25 22:09, Liam R. Howlett 写道: > Static analyser of the maple tree code noticed that the split variable > is being used to dereference into an array prior to checking the > variable itself. Fix this issue by changing the order of the statement > to check the variable first. > > Reported-by: David Binderman > Signed-off-by: Liam R. Howlett Reviewed-by: Peng Zhang > --- > lib/maple_tree.c | 5 +++-- > 1 file changed, 3 insertions(+), 2 deletions(-) > > diff --git a/lib/maple_tree.c b/lib/maple_tree.c > index 110a36479dced..9cf4fca42310c 100644 > --- a/lib/maple_tree.c > +++ b/lib/maple_tree.c > @@ -1943,8 +1943,9 @@ static inline int mab_calc_split(struct ma_state *mas, > * causes one node to be deficient. > * NOTE: mt_min_slots is 1 based, b_end and split are zero. > */ > - while (((bn->pivot[split] - min) < slot_count - 1) && > - (split < slot_count - 1) && (b_end - split > slot_min)) > + while ((split < slot_count - 1) && > + ((bn->pivot[split] - min) < slot_count - 1) && > + (b_end - split > slot_min)) > split++; > } >