diff options
Diffstat (limited to 'drivers/char/mem.c')
| -rw-r--r-- | drivers/char/mem.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/char/mem.c b/drivers/char/mem.c index 6511012cbdc..55473371b7c 100644 --- a/drivers/char/mem.c +++ b/drivers/char/mem.c @@ -26,6 +26,7 @@ #include <linux/backing-dev.h> #include <linux/bootmem.h> #include <linux/pipe_fs_i.h> +#include <linux/pfn.h> #include <asm/uaccess.h> #include <asm/io.h> @@ -292,8 +293,8 @@ static int mmap_kmem(struct file * file, struct vm_area_struct * vma) { unsigned long pfn; - /* Turn a kernel-virtual address into a physical page frame */ - pfn = __pa((u64)vma->vm_pgoff << PAGE_SHIFT) >> PAGE_SHIFT; + /* Turn a pfn offset into an absolute pfn */ + pfn = PFN_DOWN(virt_to_phys((void *)PAGE_OFFSET)) + vma->vm_pgoff; /* * RED-PEN: on some architectures there is more mapped memory |