linux-kernel - [PATCH 3.18 54/92] arch/powerpc: provide zero

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

Date:   Wed,  9 Aug 2017 13:37:22 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Michal Sojka <sojkam1@....cvut.cz>,
        Michael Ellerman <mpe@...erman.id.au>,
        Chris Metcalf <cmetcalf@...hip.com>
Subject: [PATCH 3.18 54/92] arch/powerpc: provide zero_bytemask() for big-endian

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Chris Metcalf <cmetcalf@...hip.com>

commit 7a5692e6e533fd379081ab06fb58f3f5ee4d80bc upstream.

For some reason, only the little-endian flavor of
powerpc provided the zero_bytemask() implementation.

Reported-by: Michal Sojka <sojkam1@....cvut.cz>
Acked-by: Michael Ellerman <mpe@...erman.id.au>
Signed-off-by: Chris Metcalf <cmetcalf@...hip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/powerpc/include/asm/word-at-a-time.h |    5 +++++
 1 file changed, 5 insertions(+)

--- a/arch/powerpc/include/asm/word-at-a-time.h
+++ b/arch/powerpc/include/asm/word-at-a-time.h
@@ -40,6 +40,11 @@ static inline bool has_zero(unsigned lon
 	return (val + c->high_bits) & ~rhs;
 }
 
+static inline unsigned long zero_bytemask(unsigned long mask)
+{
+	return ~1ul << __fls(mask);
+}
+
 #else
 
 #ifdef CONFIG_64BIT