On 01/02/2018 06:23 AM, Geert Uytterhoeven wrote:
> Hi Arnd,
>
> On Tue, Jan 2, 2018 at 12:01 PM, Arnd Bergmann <arnd at arndb.de> wrote:
>> The missing 'volatile' keyword on the iounmap argument leads to lots of
>> harmless warnings in an allmodconfig build:
>>
>> sound/pci/echoaudio/echoaudio.c:1879:10: warning: passing argument 1 of 'iounmap' discards 'volatile' qualifier f
>> pointer target type [-Wdiscarded-qualifiers]
>>
>> Signed-off-by: Arnd Bergmann <arnd at arndb.de>
Arnd, do you agree to Geert's comments - if you are busy I can respin a v2 ?
Thx,
-Vineet
>> ---
>> arch/arc/include/asm/io.h | 4 ++--
>> arch/arc/mm/ioremap.c | 2 +-
>> 2 files changed, 3 insertions(+), 3 deletions(-)
>>
>> diff --git a/arch/arc/include/asm/io.h b/arch/arc/include/asm/io.h
>> index c22b181e8206..2c9b98fabf82 100644
>> --- a/arch/arc/include/asm/io.h
>> +++ b/arch/arc/include/asm/io.h
>> @@ -30,11 +30,11 @@ static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
>> return (void __iomem *)port;
>> }
>>
>> -static inline void ioport_unmap(void __iomem *addr)
>> +static inline void ioport_unmap(volatile void __iomem *addr)
>> {
>> }
>>
>> -extern void iounmap(const void __iomem *addr);
>> +extern void iounmap(const volatile void __iomem *addr);
>
> Note that include/asm-generic/io.h also lacks the volatiles?
>
>>
>> #define ioremap_nocache(phy, sz) ioremap(phy, sz)
>> #define ioremap_wc(phy, sz) ioremap(phy, sz)
>> diff --git a/arch/arc/mm/ioremap.c b/arch/arc/mm/ioremap.c
>> index 9881bd740ccc..94d0116063a8 100644
>> --- a/arch/arc/mm/ioremap.c
>> +++ b/arch/arc/mm/ioremap.c
>> @@ -95,7 +95,7 @@ void __iomem *ioremap_prot(phys_addr_t paddr, unsigned long size,
>> EXPORT_SYMBOL(ioremap_prot);
>>
>>
>> -void iounmap(const void __iomem *addr)
>> +void iounmap(volatile const void __iomem *addr)
>
> const volatile?
>
>> {
>> /* weird double cast to handle phys_addr_t > 32 bits */
>> if (arc_uncached_addr_space((phys_addr_t)(u32)addr))
>
> Gr{oetje,eeting}s,
>
> Geert
>
