From: Florian Fainelli <f.fainelli@gmail.com>
Date: Tue, 28 Jan 2020 19:22:13 +0000 (+0100)
Subject: ARM: 8957/1: VDSO: Match ARMv8 timer in cntvct_functional()
X-Git-Tag: v4.9.217~4
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3a4c51d02e70ca4af86cd5b50c4aef3007e04e03;p=thirdparty%2Fkernel%2Fstable.git

ARM: 8957/1: VDSO: Match ARMv8 timer in cntvct_functional()

commit 45939ce292b4b11159719faaf60aba7d58d5fe33 upstream.

It is possible for a system with an ARMv8 timer to run a 32-bit kernel.
When this happens we will unconditionally have the vDSO code remove the
__vdso_gettimeofday and __vdso_clock_gettime symbols because
cntvct_functional() returns false since it does not match that
compatibility string.

Fixes: ecf99a439105 ("ARM: 8331/1: VDSO initialization, mapping, and synchronization")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/arch/arm/kernel/vdso.c b/arch/arm/kernel/vdso.c
index 8904397373742..bf6e45dec0173 100644
--- a/arch/arm/kernel/vdso.c
+++ b/arch/arm/kernel/vdso.c
@@ -85,6 +85,8 @@ static bool __init cntvct_functional(void)
 	 * this.
 	 */
 	np = of_find_compatible_node(NULL, NULL, "arm,armv7-timer");
+	if (!np)
+		np = of_find_compatible_node(NULL, NULL, "arm,armv8-timer");
 	if (!np)
 		goto out_put;