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From:   Yury Norov <yury.norov@gmail.com>
To:     Yury Norov <yury.norov@gmail.com>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Rasmus Villemoes <linux@rasmusvillemoes.dk>,
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        Joe Perches <joe@perches.com>, Dennis Zhou <dennis@kernel.org>,
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        Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>,
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        Dave Hansen <dave.hansen@linux.intel.com>,
        "H. Peter Anvin" <hpa@zytor.com>, x86@kernel.org
Subject: [PATCH 28/54] arch/x86: replace bitmap_weight with bitmap_weight_{eq,gt,ge,lt,le} where appropriate
Date:   Sun, 23 Jan 2022 10:38:59 -0800
Message-Id: <20220123183925.1052919-29-yury.norov@gmail.com>
In-Reply-To: <20220123183925.1052919-1-yury.norov@gmail.com>
References: <20220123183925.1052919-1-yury.norov@gmail.com>
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__init_one_rdt_domain in rdtgroup.c code calls bitmap_weight() to compare
the weight of bitmap with a given number. We can do it more efficiently
with bitmap_weight_lt because conditional bitmap_weight() may stop
traversing the bitmap earlier, as soon as condition is met.

Signed-off-by: Yury Norov <yury.norov@gmail.com>
---
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index e23ff03290b8..9d42e592c1cf 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -2752,7 +2752,7 @@ static int __init_one_rdt_domain(struct rdt_domain *d, struct resctrl_schema *s,
 	 * bitmap_weight() does not access out-of-bound memory.
 	 */
 	tmp_cbm = cfg->new_ctrl;
-	if (bitmap_weight(&tmp_cbm, r->cache.cbm_len) < r->cache.min_cbm_bits) {
+	if (bitmap_weight_lt(&tmp_cbm, r->cache.cbm_len, r->cache.min_cbm_bits)) {
 		rdt_last_cmd_printf("No space on %s:%d\n", s->name, d->id);
 		return -ENOSPC;
 	}
-- 
2.30.2