linux-kernel - [RESEND Patch 1/2] bitops: simplify get_count_order

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Message-Id: <20200807085837.11697-2-richard.weiyang@linux.alibaba.com>
Date:   Fri,  7 Aug 2020 16:58:36 +0800
From:   Wei Yang <richard.weiyang@...ux.alibaba.com>
To:     akpm@...ux-foundation.org, christian.brauner@...ntu.com,
        andriy.shevchenko@...ux.intel.com
Cc:     linux-kernel@...r.kernel.org,
        Wei Yang <richard.weiyang@...ux.alibaba.com>
Subject: [RESEND Patch 1/2] bitops: simplify get_count_order_long()

These two cases could be unified into one.

Signed-off-by: Wei Yang <richard.weiyang@...ux.alibaba.com>
---
 include/linux/bitops.h | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/include/linux/bitops.h b/include/linux/bitops.h
index 99f2ac30b1d9..030a98f0c452 100644
--- a/include/linux/bitops.h
+++ b/include/linux/bitops.h
@@ -206,10 +206,7 @@ static inline int get_count_order_long(unsigned long l)
 {
 	if (l == 0UL)
 		return -1;
-	else if (l & (l - 1UL))
-		return (int)fls_long(l);
-	else
-		return (int)fls_long(l) - 1;
+	return (int)fls_long(--l);
 }
 
 /**
-- 
2.20.1 (Apple Git-117)