linux-kernel - Re: [PATCH 01/11] ARM: disable virt_to_bus/virt_to

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Date:	Sat, 16 Feb 2013 19:18:04 -0300
From:	Emilio López <emilio@...pez.com.ar>
To:	Arnd Bergmann <arnd@...db.de>
CC:	arm@...nel.org, Russell King <linux@....linux.org.uk>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 01/11] ARM: disable virt_to_bus/virt_to_bus almost everywhere

Hello Arnd,

El 14/02/13 10:49, Arnd Bergmann escribió:
> We are getting a number of warnings about the use of the deprecated
> bus_to_virt function in drivers using the ARM ISA DMA API:
> 
> drivers/parport/parport_pc.c: In function 'parport_pc_fifo_write_block_dma':
> drivers/parport/parport_pc.c:622:3: warning: 'bus_to_virt' is deprecated
> (declared at arch/arm/include/asm/memory.h:253) [-Wdeprecated-declarations]
> 
> This is only because that function gets used by the inline
> set_dma_addr() helper. We know that any driver for the ISA DMA API
> is correctly using the DMA addresses, so we can change this
> to use the __bus_to_virt() function instead, which does not warn.
> 
> After this, there are no remaining drivers that are used on
> any defconfigs on ARM using virt_to_bus or bus_to_virt, with
> the exception of the OSS sound driver. That driver is only used
> on RiscPC, NetWinder and Shark, so we can set ARCH_NO_VIRT_TO_BUS
> on all other platforms and hide the deprecated functions, which
> is far more effective than marking them as deprecated, in order
> to avoid any new users of that code.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Cc: Russell King <linux@....linux.org.uk>

Small nitpick: Please have a look at the patch subject, I suppose you
meant something like "virt_to_bus/bus_to_virt" instead of
"virt_to_bus/virt_to_bus".

Thanks,

Emilio
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