linux-kernel - [PATCH 5.4 54/60] ARM: 8957/1: VDSO: Match ARMv8 timer in cntvct

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Message-Id: <20200319123936.385542498@linuxfoundation.org>
Date:   Thu, 19 Mar 2020 14:04:32 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Florian Fainelli <f.fainelli@...il.com>,
        Russell King <rmk+kernel@...linux.org.uk>
Subject: [PATCH 5.4 54/60] ARM: 8957/1: VDSO: Match ARMv8 timer in cntvct_functional()

From: Florian Fainelli <f.fainelli@...il.com>

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@...il.com>
Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

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

--- a/arch/arm/kernel/vdso.c
+++ b/arch/arm/kernel/vdso.c
@@ -93,6 +93,8 @@ 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"))