linux-kernel - [PATCH] bitops: use the same mechanism for get_count_order[

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20200525215958.21653-1-richard.weiyang@gmail.com>
Date:   Mon, 25 May 2020 21:59:58 +0000
From:   Wei Yang <richard.weiyang@...il.com>
To:     akpm@...ux-foundation.org, andriy.shevchenko@...ux.intel.com,
        christian.brauner@...ntu.com
Cc:     linux-kernel@...r.kernel.org, Wei Yang <richard.weiyang@...il.com>
Subject: [PATCH] bitops: use the same mechanism for get_count_order[_long]

These two functions share the same logic.

Signed-off-by: Wei Yang <richard.weiyang@...il.com>
---
 include/linux/bitops.h | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/include/linux/bitops.h b/include/linux/bitops.h
index 5b5609e81a84..80703ef27aee 100644
--- a/include/linux/bitops.h
+++ b/include/linux/bitops.h
@@ -188,12 +188,10 @@ static inline unsigned fls_long(unsigned long l)
 
 static inline int get_count_order(unsigned int count)
 {
-	int order;
+	if (count == 0)
+		return -1;
 
-	order = fls(count) - 1;
-	if (count & (count - 1))
-		order++;
-	return order;
+	return fls(--count);
 }
 
 /**
-- 
2.23.0