linux-kernel - Re: [PATCH V4] Fix pointer cast for 32 bits arch

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Message-ID: <20150417081134.GN10964@mwanda>
Date:	Fri, 17 Apr 2015 11:11:34 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Alan Cox <alan@...ux.intel.com>
Cc:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Peter Senna Tschudin <peter.senna@...il.com>,
	driverdevel <devel@...verdev.osuosl.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jun Tian <jun.j.tian@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andreas <schwab@...ux-m68k.org>,
	Garret Kelly <garret.kelly@...il.com>,
	Octavian Purdila <octavian.purdila@...el.com>,
	Nick Kralevich <nnk@...gle.com>
Subject: Re: [PATCH V4] Fix pointer cast for 32 bits arch

On Thu, Apr 16, 2015 at 06:05:27PM +0100, Alan Cox wrote:
> Its a 64 on 64 or 32 on 32 virtual machine. Goldfish is used for Android
> emulation for all the system level phone emulation tools. On the
> emulation side it provides an interface for the emulated OS but makes no
> effort to emulate it as if it was a real hardware. If you think of it as
> a funky emulator interface all is good. If you think about it as
> "hardware" you've got the wrong model and chunks of Goldfish make less
> sense.
> 

Ah.  Ok.  That makes sense.

Peter maybe the fix is to make a different function:

static inline void gf_write_dma_addr(dma_addr_t addr, void __iomem *portl,
				     void __iomem *porth)
{
        writel((u32)data, portl);
#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
        writel(data >> 32, porth);
#endif
}

Something like that.

The gf_write_ptr() function patch you wrote preserves the current
behavior, but the current behavior is buggy, (I think) so we need
both gf_write_dma_addr() and gf_write_ptr().

regards,
dan carpenter

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