| Message ID | 20241014144506.51754-3-hch@lst.de |
|---|---|
| State | New |
| Headers | show |
| Series | [1/2] asm-generic: provide generic page_to_phys and phys_to_page implementations | expand |
On 14/10/2024 16.44, Christoph Hellwig wrote: > page_to_pfn is usually implemented by pointer arithmetics on the memory > map, which means that bogus input can lead to even more bogus output. > > Powerpc had a pfn_valid check on the regult to it's page_to_phys s/regult/result/ > implementation when CONFIG_DEBUG_VIRTUAL is defined, which seems > generally useful, so add that to the generic version. > > Signed-off-by: Christoph Hellwig <hch@lst.de> > --- > include/asm-generic/memory_model.h | 10 ++++++++++ > 1 file changed, 10 insertions(+) > > diff --git a/include/asm-generic/memory_model.h b/include/asm-generic/memory_model.h > index a73a140cbecdd7..6d1fb6162ac1a6 100644 > --- a/include/asm-generic/memory_model.h > +++ b/include/asm-generic/memory_model.h > @@ -64,7 +64,17 @@ static inline int pfn_valid(unsigned long pfn) > #define page_to_pfn __page_to_pfn > #define pfn_to_page __pfn_to_page > > +#ifdef CONFIG_DEBUG_VIRTUAL > +#define page_to_phys(page) \ > +({ \ > + unsigned long __pfn = page_to_pfn(page); \ > + \ > + WARN_ON_ONCE(!pfn_valid(__pfn)); \ > + PFN_PHYS(__pfn); \ > +}) > +#else > #define page_to_phys(page) PFN_PHYS(page_to_pfn(page)) > +#endif /* CONFIG_DEBUG_VIRTUAL */ > #define phys_to_page(phys) pfn_to_page(PHYS_PFN(phys)) > > #endif /* __ASSEMBLY__ */ With the typo fixed: Reviewed-by: Thomas Huth <thuth@redhat.com>
diff --git a/include/asm-generic/memory_model.h b/include/asm-generic/memory_model.h index a73a140cbecdd7..6d1fb6162ac1a6 100644 --- a/include/asm-generic/memory_model.h +++ b/include/asm-generic/memory_model.h @@ -64,7 +64,17 @@ static inline int pfn_valid(unsigned long pfn) #define page_to_pfn __page_to_pfn #define pfn_to_page __pfn_to_page +#ifdef CONFIG_DEBUG_VIRTUAL +#define page_to_phys(page) \ +({ \ + unsigned long __pfn = page_to_pfn(page); \ + \ + WARN_ON_ONCE(!pfn_valid(__pfn)); \ + PFN_PHYS(__pfn); \ +}) +#else #define page_to_phys(page) PFN_PHYS(page_to_pfn(page)) +#endif /* CONFIG_DEBUG_VIRTUAL */ #define phys_to_page(phys) pfn_to_page(PHYS_PFN(phys)) #endif /* __ASSEMBLY__ */
page_to_pfn is usually implemented by pointer arithmetics on the memory map, which means that bogus input can lead to even more bogus output. Powerpc had a pfn_valid check on the regult to it's page_to_phys implementation when CONFIG_DEBUG_VIRTUAL is defined, which seems generally useful, so add that to the generic version. Signed-off-by: Christoph Hellwig <hch@lst.de> --- include/asm-generic/memory_model.h | 10 ++++++++++ 1 file changed, 10 insertions(+)