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asm-generic/page.h: Make pfn accessors static inlines

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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.

For symmetry we do the same change for pfn_to_virt.

Immediately define virt_to_pfn and pfn_to_virt to the static
inline after the static inline since this style of defining
functions is used for the generic helpers.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Linus Walleij 2022-06-01 11:47:06 +02:00
parent e36bfc0bc3
commit 2d78057f0d
1 changed files with 10 additions and 2 deletions
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12
include/asm-generic/page.h
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@ -74,8 +74,16 @@ extern unsigned long memory_end;
#define __va(x) ((void *)((unsigned long) (x))) #define __va(x) ((void *)((unsigned long) (x)))
#define __pa(x) ((unsigned long) (x)) #define __pa(x) ((unsigned long) (x))
#define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT) static inline unsigned long virt_to_pfn(const void *kaddr)
#define pfn_to_virt(pfn) __va((pfn) << PAGE_SHIFT) {
return __pa(kaddr) >> PAGE_SHIFT;
}
#define virt_to_pfn virt_to_pfn
static inline void *pfn_to_virt(unsigned long pfn)
{
return __va(pfn) << PAGE_SHIFT;
}
#define pfn_to_virt pfn_to_virt
#define virt_to_page(addr) pfn_to_page(virt_to_pfn(addr)) #define virt_to_page(addr) pfn_to_page(virt_to_pfn(addr))
#define page_to_virt(page) pfn_to_virt(page_to_pfn(page)) #define page_to_virt(page) pfn_to_virt(page_to_pfn(page))