Introduce a new vma flag 'VM_PGOFF_IS_PFN', which means vma->vm_pgoff == pfn. This allows us to directly obtain pfn through vma->vm_pgoff. No Functional Change. Signed-off-by: Qinyun Tan <qinyuntan@xxxxxxxxxxxxxxxxx> Reviewed-by: Guanghui Feng <guanghuifeng@xxxxxxxxxxxxxxxxx> Reviewed-by: Xunlei Pang <xlpang@xxxxxxxxxxxxxxxxx> --- include/linux/mm.h | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/include/linux/mm.h b/include/linux/mm.h index ecf63d2b05825..80849b1b9aa92 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -322,6 +322,12 @@ extern unsigned int kobjsize(const void *objp); #define VM_NOHUGEPAGE 0x40000000 /* MADV_NOHUGEPAGE marked this vma */ #define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */ +#ifdef CONFIG_ARCH_USES_HIGH_VMA_FLAGS /* vma->vm_pgoff == pfn */ + #define VM_PGOFF_IS_PFN BIT(62) +#else + #define VM_PGOFF_IS_PFN VM_NONE +#endif + #ifdef CONFIG_ARCH_USES_HIGH_VMA_FLAGS #define VM_HIGH_ARCH_BIT_0 32 /* bit only usable on 64-bit architectures */ #define VM_HIGH_ARCH_BIT_1 33 /* bit only usable on 64-bit architectures */ -- 2.43.5
