Linus Walleij <linus.walleij@xxxxxxxxxx> writes:
> Making virt_to_pfn() a static inline taking a strongly typed
> (const void *) makes the contract of a passing a pointer of that
> type to the function explicit and exposes any misuse of the
> macro virt_to_pfn() acting polymorphic and accepting many types
> such as (void *), (unitptr_t) or (unsigned long) as arguments
> without warnings.
...
> diff --git a/arch/powerpc/include/asm/page.h b/arch/powerpc/include/asm/page.h
> index f2b6bf5687d0..9ee4b6d4a82a 100644
> --- a/arch/powerpc/include/asm/page.h
> +++ b/arch/powerpc/include/asm/page.h
> @@ -9,6 +9,7 @@
> #ifndef __ASSEMBLY__
> #include <linux/types.h>
> #include <linux/kernel.h>
> +#include <linux/bug.h>
> #else
> #include <asm/types.h>
> #endif
> @@ -119,16 +120,6 @@ extern long long virt_phys_offset;
> #define ARCH_PFN_OFFSET ((unsigned long)(MEMORY_START >> PAGE_SHIFT))
> #endif
>
> -#define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT)
> -#define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
> -#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
> -
> -#define virt_addr_valid(vaddr) ({ \
> - unsigned long _addr = (unsigned long)vaddr; \
> - _addr >= PAGE_OFFSET && _addr < (unsigned long)high_memory && \
> - pfn_valid(virt_to_pfn(_addr)); \
> -})
> -
> /*
> * On Book-E parts we need __va to parse the device tree and we can't
> * determine MEMORY_START until then. However we can determine PHYSICAL_START
> @@ -233,6 +224,25 @@ extern long long virt_phys_offset;
> #endif
> #endif
>
> +#ifndef __ASSEMBLY__
> +static inline unsigned long virt_to_pfn(const void *kaddr)
> +{
> + return __pa(kaddr) >> PAGE_SHIFT;
> +}
> +
> +static inline const void *pfn_to_kaddr(unsigned long pfn)
> +{
> + return (const void *)(((unsigned long)__va(pfn)) << PAGE_SHIFT);
Any reason to do it this way rather than:
+ return __va(pfn << PAGE_SHIFT);
Seems to be equivalent and much cleaner?
cheers
