linux-kernel - Re: [patch 2.6.27-rc1] /dev/hpet

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Date:	Thu, 31 Jul 2008 12:59:56 -0700
From:	David Brownell <david-b@...bell.net>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Clemens Ladisch <clemens@...isch.de>,
	lkml <linux-kernel@...r.kernel.org>, bob.picco@...com,
	venkatesh.pallipadi@...el.com, Vojtech Pavlik <vojtech@...e.cz>,
	the arch/x86 maintainers <x86@...nel.org>,
	Adrian Bunk <bunk@...nel.org>
Subject: Re: [patch 2.6.27-rc1] /dev/hpet - fixes and cleanup

On Thursday 31 July 2008, Ingo Molnar wrote:
>   drivers/built-in.o: In function `hpet_alloc':
>   : undefined reference to `__udivdi3'
>   drivers/built-in.o: In function `hpet_alloc':
>   : undefined reference to `__umoddi3'

Verified on 64 and 32 bit builds.

Signed-off-by: David Brownell <dbrownell@...rs.sourceforge.net>

--- a/drivers/char/hpet.c	2008-07-31 11:22:07.000000000 -0700
+++ b/drivers/char/hpet.c	2008-07-31 11:21:15.000000000 -0700
@@ -701,6 +701,7 @@ int hpet_alloc(struct hpet_data *hdp)
 	static struct hpets *last = NULL;
 	unsigned long period;
 	unsigned long long temp;
+	u32 remainder;
 
 	/*
 	 * hpet_alloc can be called by platform dependent code.
@@ -764,12 +765,13 @@ int hpet_alloc(struct hpet_data *hdp)
 		printk("%s %d", i > 0 ? "," : "", hdp->hd_irq[i]);
 	printk("\n");
 
+	temp = hpetp->hp_tick_freq;
+	remainder = do_div(temp, 1000000);
 	printk(KERN_INFO
 		"hpet%u: %u comparators, %d-bit %u.%06u MHz counter\n",
 		hpetp->hp_which, hpetp->hp_ntimer,
 		cap & HPET_COUNTER_SIZE_MASK ? 64 : 32,
-		(unsigned) (hpetp->hp_tick_freq / 1000000),
-		(unsigned) (hpetp->hp_tick_freq % 1000000));
+		(unsigned) temp, remainder);
 
 	mcfg = readq(&hpet->hpet_config);
 	if ((mcfg & HPET_ENABLE_CNF_MASK) == 0) {

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