linux-kernel - Re: sound/pci/asihpi/hpioctl.c:125:6: warning: cast to pointer from integer of different size

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Date:	Fri, 8 Feb 2013 22:57:27 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Ville Syrjälä <ville.syrjala@...ux.intel.com>
Cc:	"H. Peter Anvin" <hpa@...ux.intel.com>,
	kbuild test robot <fengguang.wu@...el.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: sound/pci/asihpi/hpioctl.c:125:6: warning: cast to pointer
	from integer of different size

On Fri, Feb 08, 2013 at 08:50:57PM +0200, Ville Syrjälä wrote:
> 	struct {
> 		uint8_t sika1;
> 		uint16_t sika2;
> 		uint32_t sika4;
> 		uint64_t sika8;

Note - you also need to check what the behaviour is with a pointer type
too - that's the one that gets ARM if you try this.  My test set on ARM
was:

int test_8(unsigned char *v, unsigned char *p)
{
        return get_user(*v, p);
}

int test_16(unsigned short *v, unsigned short *p)
{
        return get_user(*v, p);
}

int test_32(unsigned int *v, unsigned int *p)
{
        return get_user(*v, p);
}

int test_32_constp(unsigned int *v, const unsigned int *p)
{
        return get_user(*v, p);
}

int test_64(unsigned long long *v, unsigned long long *p)
{
        return get_user(*v, p);
}

int test_64_narrow(unsigned long *v, unsigned long long *p)
{
        return get_user(*v, p);
}

int test_ptr(unsigned int **v, unsigned int **p)
{
        return get_user(*v, p);
}

int test_wrong(char **v, const char **p)
{
        return get_user(*v, p);
}

All but the last should build cleanly and correctly.  The last should
issue a warning.
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