openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

ARM: disable virt_to_bus/virt_to_bus almost everywhere 

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@arndb.de>
Cc: Russell King <linux@arm.linux.org.uk>
This commit is contained in:
Arnd Bergmann 2012-11-12 22:16:12 +00:00
parent 88b62b915b
commit a5d533ee07
4 changed files with 7 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/arm/Kconfig
View File

@ -1450,6 +1450,10 @@ config ISA_DMA
bool
select ISA_DMA_API
config ARCH_NO_VIRT_TO_BUS
def_bool y
depends on !ARCH_RPC && !ARCH_NETWINDER && !ARCH_SHARK
# Select ISA DMA interface
config ISA_DMA_API
bool

1
arch/arm/configs/shark_defconfig
View File

@ -73,7 +73,6 @@ CONFIG_PARTITION_ADVANCED=y
CONFIG_NLS_CODEPAGE_437=m
CONFIG_NLS_CODEPAGE_850=m
CONFIG_NLS_ISO8859_1=m
# CONFIG_ENABLE_WARN_DEPRECATED is not set
# CONFIG_ENABLE_MUST_CHECK is not set
CONFIG_DEBUG_KERNEL=y
# CONFIG_SCHED_DEBUG is not set

2
arch/arm/include/asm/dma.h
View File

@ -105,7 +105,7 @@ extern void set_dma_sg(unsigned int chan, struct scatterlist *sg, int nr_sg);
*/
extern void __set_dma_addr(unsigned int chan, void *addr);
#define set_dma_addr(chan, addr) \
__set_dma_addr(chan, bus_to_virt(addr))
__set_dma_addr(chan, (void *)__bus_to_virt(addr))
/* Set the DMA byte count for this channel
*

2
arch/arm/include/asm/memory.h
View File

@ -245,6 +245,7 @@ static inline void *phys_to_virt(phys_addr_t x)
#define __bus_to_pfn(x) __phys_to_pfn(x)
#endif
#ifdef CONFIG_VIRT_TO_BUS
static inline __deprecated unsigned long virt_to_bus(void *x)
{
return __virt_to_bus((unsigned long)x);
@ -254,6 +255,7 @@ static inline __deprecated void *bus_to_virt(unsigned long x)
{
return (void *)__bus_to_virt(x);
}
#endif
/*
* Conversion between a struct page and a physical address.