linux-kernel - [PATCH] clocksource: mmio: remove artificial 32bit limitation

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Message-Id: <1449768101-6879-1-git-send-email-linus.walleij@linaro.org>
Date:	Thu, 10 Dec 2015 18:21:41 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>
Cc:	linux-kernel@...r.kernel.org,
	Alexander Sverdlin <alexander.sverdlin@...il.com>,
	Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH] clocksource: mmio: remove artificial 32bit limitation

The EP93xx is registering a clocksource of 40 bits with
clocksource_mmio_init() but this is not working because of this
artificial limitation. It works fine to lift the uppe limit to
64 bits, and since cycle_t is u64, it should intuitively have been
like that from the beginning.

Fixes: 000bc17817bf "ARM: ep93xx: switch to GENERIC_CLOCKEVENTS"
Reported-by: Alexander Sverdlin <alexander.sverdlin@...il.com>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
---
 drivers/clocksource/mmio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clocksource/mmio.c b/drivers/clocksource/mmio.c
index 1593ade2a815..c4f7d7a9b689 100644
--- a/drivers/clocksource/mmio.c
+++ b/drivers/clocksource/mmio.c
@@ -55,7 +55,7 @@ int __init clocksource_mmio_init(void __iomem *base, const char *name,
 {
 	struct clocksource_mmio *cs;
 
-	if (bits > 32 || bits < 16)
+	if (bits > 64 || bits < 16)
 		return -EINVAL;
 
 	cs = kzalloc(sizeof(struct clocksource_mmio), GFP_KERNEL);
-- 
2.4.3

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