[PATCH 5.5 59/65] ARM: 8957/1: VDSO: Match ARMv8 timer in cntvct_functional()

From: Greg Kroah-Hartman
Date: Thu Mar 19 2020 - 09:28:23 EST


From: Florian Fainelli <f.fainelli@xxxxxxxxx>

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@xxxxxxxxx>
Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
arch/arm/kernel/vdso.c | 2 ++
1 file changed, 2 insertions(+)

--- a/arch/arm/kernel/vdso.c
+++ b/arch/arm/kernel/vdso.c
@@ -95,6 +95,8 @@ static bool __init cntvct_functional(voi
*/
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;

if (of_property_read_bool(np, "arm,cpu-registers-not-fw-configured"))