linux-kernel - [PATCH 3/5] mm/vmalloc.c: correct lazy_max

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Message-ID: <57E20C49.8010304@zoho.com>
Date:   Wed, 21 Sep 2016 12:27:53 +0800
From:   zijun_hu <zijun_hu@...o.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org, zijun_hu@....com,
        tj@...nel.org, mingo@...nel.org, rientjes@...gle.com,
        iamjoonsoo.kim@....com, mgorman@...hsingularity.net
Subject: [PATCH 3/5] mm/vmalloc.c: correct lazy_max_pages() return value

From: zijun_hu <zijun_hu@....com>

correct lazy_max_pages() return value if the number of online
CPUs is power of 2

Signed-off-by: zijun_hu <zijun_hu@....com>
---
 mm/vmalloc.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index a125ae8..2804224 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -594,7 +594,9 @@ static unsigned long lazy_max_pages(void)
 {
 	unsigned int log;
 
-	log = fls(num_online_cpus());
+	log = num_online_cpus();
+	if (log > 1)
+		log = (unsigned int)get_count_order(log);
 
 	return log * (32UL * 1024 * 1024 / PAGE_SIZE);
 }
-- 
1.9.1