linux-kernel - Re: Documentation/timers/hpet

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Message-ID: <4C03203B.3050501@oracle.com>
Date:	Sun, 30 May 2010 19:34:35 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: Documentation/timers/hpet_example.c compile bug

On 05/29/10 11:41, Randy Dunlap wrote:
> On 05/28/10 04:35, Heiko Carstens wrote:
>> Hi Randy,
>>
>> since your commit e61863099f58e458f08c101da87da752a1e009f5
>> "Documentation/timers/: split txt and source files" I get this compile
>> error on s390 with an allyesconfig:
>>
>> In file included from Documentation/timers/hpet_example.c:15:
>> /usr/include/linux/hpet.h:11: error: expected specifier-qualifier-list before 'u64'
> 
> Where is the u64?  My (x86_64) copy of /usr/include/linux/hpet.h looks like:
> 
>      1	#ifndef	__HPET__
>      2	#define	__HPET__ 1
>      3	
>      4	
>      5	
>      6	
>      7	struct hpet_info {
>      8		unsigned long hi_ireqfreq;	/* Hz */
>      9		unsigned long hi_flags;	/* information */
>     10		unsigned short hi_hpet;
>     11		unsigned short hi_timer;
>     12	};
>     13	
>     14	#define HPET_INFO_PERIODIC	0x0010	/* periodic-capable comparator */
>     15	
>     16	#define	HPET_IE_ON	_IO('h', 0x01)	/* interrupt on */
>     17	#define	HPET_IE_OFF	_IO('h', 0x02)	/* interrupt off */
>     18	#define	HPET_INFO	_IOR('h', 0x03, struct hpet_info)
>     19	#define	HPET_EPI	_IO('h', 0x04)	/* enable periodic */
>     20	#define	HPET_DPI	_IO('h', 0x05)	/* disable periodic */
>     21	#define	HPET_IRQFREQ	_IOW('h', 0x6, unsigned long)	/* IRQFREQ usec */
>     22	
>     23	#endif				/* !__HPET__ */
> 
> I guess s390 hpet.h looks different?  Does it just need to #include <linux/types.h> ?
> Or is the problem the kernel-space u64 vs. userspace __u64?
> 
>> Please fix.
> 
> Any suggestions?

Does it even make sense to build hpet_example on s390?
I.e., does s390 have hpet?
If not, then a simple Kconfig "depends on X86" or "depends on !S390" will fix this.

-- 
~Randy
*** Remember to use Documentation/SubmitChecklist when testing your code ***
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