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Message-ID: <YtXMjwXnRIT+YHg7@smile.fi.intel.com> Date: Tue, 19 Jul 2022 00:11:43 +0300 From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com> To: Yury Norov <yury.norov@...il.com> Cc: linux-kernel@...r.kernel.org, Alexander Lobakin <alexandr.lobakin@...el.com>, Alexei Starovoitov <ast@...nel.org>, Alexey Klimov <aklimov@...hat.com>, Andrew Morton <akpm@...ux-foundation.org>, Andrii Nakryiko <andrii@...nel.org>, Ben Segall <bsegall@...gle.com>, Christoph Lameter <cl@...ux.com>, Dan Williams <dan.j.williams@...el.com>, Daniel Borkmann <daniel@...earbox.net>, Daniel Bristot de Oliveira <bristot@...hat.com>, Dennis Zhou <dennis@...nel.org>, Dietmar Eggemann <dietmar.eggemann@....com>, Eric Dumazet <edumazet@...gle.com>, Frederic Weisbecker <fweisbec@...il.com>, Guenter Roeck <linux@...ck-us.net>, Ingo Molnar <mingo@...hat.com>, Isabella Basso <isabbasso@...eup.net>, John Fastabend <john.fastabend@...il.com>, Josh Poimboeuf <jpoimboe@...nel.org>, Juergen Gross <jgross@...e.com>, Juri Lelli <juri.lelli@...hat.com>, KP Singh <kpsingh@...nel.org>, Kees Cook <keescook@...omium.org>, Martin KaFai Lau <kafai@...com>, Mel Gorman <mgorman@...e.de>, Miroslav Benes <mbenes@...e.cz>, Nathan Chancellor <nathan@...nel.org>, "Paul E . McKenney" <paulmck@...nel.org>, Peter Zijlstra <peterz@...radead.org>, Randy Dunlap <rdunlap@...radead.org>, Rasmus Villemoes <linux@...musvillemoes.dk>, Sebastian Andrzej Siewior <bigeasy@...utronix.de>, Song Liu <songliubraving@...com>, Steven Rostedt <rostedt@...dmis.org>, Tejun Heo <tj@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, Valentin Schneider <vschneid@...hat.com>, Vincent Guittot <vincent.guittot@...aro.org>, Vlastimil Babka <vbabka@...e.cz>, Yonghong Song <yhs@...com>, linux-mm@...ck.org, netdev@...r.kernel.org, bpf@...r.kernel.org Subject: Re: [PATCH 06/16] lib/test_bitmap: delete meaningless test for bitmap_cut On Mon, Jul 18, 2022 at 12:28:34PM -0700, Yury Norov wrote: > One of bitmap_cut() tests passed it with: > nbits = BITS_PER_LONG; > first = BITS_PER_LONG; > cut = BITS_PER_LONG; > > This test is useless because the range to cut is not inside the > bitmap. This should normally raise an error, but bitmap_cut() is > void and returns nothing. > > To check if the test is passed, it just tests that the memory is > not touched by bitmap_cut(), which is probably not correct, because > if a function is passed with wrong parameters, it's too optimistic > to expect a correct, or even sane behavior. > > Now that we have bitmap_check_params(), there's a tool to detect such > things in real code, and we can drop the test. There are no "useless" tests. Same comments as per a couple of previous patches. -- With Best Regards, Andy Shevchenko
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