On 2/10/2016 10:18 PM, Dan Williams wrote:
> The pfn_t type uses an unsigned long to store a pfn + flags value. On a
> 64-bit platform the upper 12 bits of an unsigned long are never used for
> storing the value of a pfn. However, this is not true on highmem
> platforms, all 32-bits of a pfn value are used to address a 44-bit
> physical address space. A pfn_t needs to store a 64-bit value.
>
> Reported-by: Stuart Foster
> Reported-by: Julian Margetson
> Cc:
> Link: https://bugzilla.kernel.org/show_bug.cgi?id=112211
> Fixes: 01c8f1c44b83 ("mm, dax, gpu: convert vm_insert_mixed to pfn_t")
> Signed-off-by: Dan Williams
> ---
> include/linux/pfn.h |2 +-
> include/linux/pfn_t.h | 19 +--
> kernel/memremap.c |2 +-
> 3 files changed, 11 insertions(+), 12 deletions(-)
>
> diff --git a/include/linux/pfn.h b/include/linux/pfn.h
> index 2d8e49711b63..1132953235c0 100644
> --- a/include/linux/pfn.h
> +++ b/include/linux/pfn.h
> @@ -10,7 +10,7 @@
>* backing is indicated by flags in the high bits of the value.
>*/
> typedef struct {
> - unsigned long val;
> + u64 val;
> } pfn_t;
> #endif
>
> diff --git a/include/linux/pfn_t.h b/include/linux/pfn_t.h
> index 37448ab5fb5c..94994810c7c0 100644
> --- a/include/linux/pfn_t.h
> +++ b/include/linux/pfn_t.h
> @@ -9,14 +9,13 @@
>* PFN_DEV - pfn is not covered by system memmap by default
>* PFN_MAP - pfn has a dynamic page mapping established by a device driver
>*/
> -#define PFN_FLAGS_MASK (((unsigned long) ~PAGE_MASK) \
> - << (BITS_PER_LONG - PAGE_SHIFT))
> -#define PFN_SG_CHAIN (1UL << (BITS_PER_LONG - 1))
> -#define PFN_SG_LAST (1UL << (BITS_PER_LONG - 2))
> -#define PFN_DEV (1UL << (BITS_PER_LONG - 3))
> -#define PFN_MAP (1UL << (BITS_PER_LONG - 4))
> -
> -static inline pfn_t __pfn_to_pfn_t(unsigned long pfn, unsigned long flags)
> +#define PFN_FLAGS_MASK (((u64) ~PAGE_MASK) << (BITS_PER_LONG_LONG -
> PAGE_SHIFT))
> +#define PFN_SG_CHAIN (1ULL << (BITS_PER_LONG_LONG - 1))
> +#define PFN_SG_LAST (1ULL << (BITS_PER_LONG_LONG - 2))
> +#define PFN_DEV (1ULL << (BITS_PER_LONG_LONG - 3))
> +#define PFN_MAP (1ULL << (BITS_PER_LONG_LONG - 4))
> +
> +static inline pfn_t __pfn_to_pfn_t(unsigned long pfn, u64 flags)
> {
> pfn_t pfn_t = { .val = pfn | (flags & PFN_FLAGS_MASK), };
>
> @@ -29,7 +28,7 @@ static inline pfn_t pfn_to_pfn_t(unsigned long pfn)
> return __pfn_to_pfn_t(pfn, 0);
> }
>
> -extern pfn_t phys_to_pfn_t(phys_addr_t addr, unsigned long flags);
> +extern pfn_t phys_to_pfn_t(phys_addr_t addr, u64 flags);
>
> static inline bool pfn_t_has_page(pfn_t pfn)
> {
> @@ -87,7 +86,7 @@ static inline pmd_t pfn_t_pmd(pfn_t pfn, pgprot_t pgprot)
> #ifdef __HAVE_ARCH_PTE_DEVMAP
> static inline bool pfn_t_devmap(pfn_t pfn)
> {
> - const unsigned long flags = PFN_DEV|PFN_MAP;
> + const u64 flags = PFN_DEV|PFN_MAP;
>
> return (pfn.val & flags) == flags;
> }
> diff --git a/kernel/memremap.c b/kernel/memremap.c
> index 3427cca5a2a6..b04ea2f5fbfe 100644
> --- a/kernel/memremap.c
> +++ b/kernel/memremap.c
> @@ -152,7 +152,7 @@ void devm_memunmap(struct device *dev, void *addr)
> }
> EXPORT_SYMBOL(devm_memunmap);
>
> -pfn_t phys_to_pfn_t(phys_addr_t addr, unsigned long flags)
> +pfn_t phys_to_pfn_t(phys_addr_t addr, u64 flags)
> {
> return __pfn_to_pfn_t(addr >> PAGE_SHIFT, flags);
> }
>
>
>
Thanks.This fixes my issue.
Tested-by: Julian Margetson
Julian
