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Message-Id: <20220718192844.1805158-3-yury.norov@gmail.com> Date: Mon, 18 Jul 2022 12:28:30 -0700 From: Yury Norov <yury.norov@...il.com> To: 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>, Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, 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>, Yury Norov <yury.norov@...il.com>, linux-mm@...ck.org, netdev@...r.kernel.org, bpf@...r.kernel.org Subject: [PATCH 02/16] lib/bitmap: don't call bitmap_set() with len == 0 bitmap_parselist() format allows passing 0-length regions, but because len == 0 is not covered by small_const_nbits() macro, we have to call __bitmap_set() and do some prologue calculations just for nothing. Signed-off-by: Yury Norov <yury.norov@...il.com> --- lib/bitmap.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/lib/bitmap.c b/lib/bitmap.c index cd4dd848ea6a..790df2ea02df 100644 --- a/lib/bitmap.c +++ b/lib/bitmap.c @@ -712,10 +712,13 @@ struct region { static void bitmap_set_region(const struct region *r, unsigned long *bitmap) { - unsigned int start; + unsigned int start, len; - for (start = r->start; start <= r->end; start += r->group_len) - bitmap_set(bitmap, start, min(r->end - start + 1, r->off)); + for (start = r->start; start <= r->end; start += r->group_len) { + len = min(r->end - start + 1, r->off); + if (len > 0) + bitmap_set(bitmap, start, len); + } } static int bitmap_check_region(const struct region *r) -- 2.34.1
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