linux-kernel - [PATCH] clocksource: mips-gic-timer: fix clocksource counter width

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]

Date:   Wed, 21 Feb 2018 13:47:49 +0100
From:   Felix Fietkau <nbd@....name>
To:     linux-kernel@...r.kernel.org
Cc:     tglx@...utronix.de, daniel.lezcano@...aro.org,
        paul.burton@...tec.com
Subject: [PATCH] clocksource: mips-gic-timer: fix clocksource counter width

This code needs to use ffs instead of fls on the mask to determine the
shift for reading the GIC_CONFIG_COUNTBITS field.

Fixes: e07127a077c7 ("clocksource: mips-gic-timer: Use new GIC accessor functions")
Cc: Paul Burton <paul.burton@...tec.com>
Cc: stable@...r.kernel.org
Signed-off-by: Felix Fietkau <nbd@....name>
---
 drivers/clocksource/mips-gic-timer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clocksource/mips-gic-timer.c b/drivers/clocksource/mips-gic-timer.c
index a04808a21d4e..bf0eee78c6ef 100644
--- a/drivers/clocksource/mips-gic-timer.c
+++ b/drivers/clocksource/mips-gic-timer.c
@@ -166,7 +166,7 @@ static int __init __gic_clocksource_init(void)
 
 	/* Set clocksource mask. */
 	count_width = read_gic_config() & GIC_CONFIG_COUNTBITS;
-	count_width >>= __fls(GIC_CONFIG_COUNTBITS);
+	count_width >>= __ffs(GIC_CONFIG_COUNTBITS);
 	count_width *= 4;
 	count_width += 32;
 	gic_clocksource.mask = CLOCKSOURCE_MASK(count_width);
-- 
2.14.2