tree e52389322e063c5b784ead6ec314503f7646c765 parent 2da5bf80f754e28cc153362e5ed1edaa9740897a author Linus Torvalds <[EMAIL PROTECTED]> Sun, 14 Aug 2005 04:22:59 -0700 committer Linus Torvalds <[EMAIL PROTECTED]> Sun, 14 Aug 2005 04:22:59 -0700
Fix up mmap of /dev/kmem This leaves the issue of whether we should deprecate the whole thing (or if we should check the whole mmap range, for that matter) open. Just do the minimal fix for now. drivers/char/mem.c | 12 ++++++++---- 1 files changed, 8 insertions(+), 4 deletions(-) diff --git a/drivers/char/mem.c b/drivers/char/mem.c --- a/drivers/char/mem.c +++ b/drivers/char/mem.c @@ -261,7 +261,11 @@ static int mmap_mem(struct file * file, static int mmap_kmem(struct file * file, struct vm_area_struct * vma) { - unsigned long long val; + unsigned long pfn; + + /* Turn a kernel-virtual address into a physical page frame */ + pfn = __pa((u64)vma->vm_pgoff << PAGE_SHIFT) >> PAGE_SHIFT; + /* * RED-PEN: on some architectures there is more mapped memory * than available in mem_map which pfn_valid checks @@ -269,10 +273,10 @@ static int mmap_kmem(struct file * file, * * RED-PEN: vmalloc is not supported right now. */ - if (!pfn_valid(vma->vm_pgoff)) + if (!pfn_valid(pfn)) return -EIO; - val = (u64)vma->vm_pgoff << PAGE_SHIFT; - vma->vm_pgoff = __pa(val) >> PAGE_SHIFT; + + vma->vm_pgoff = pfn; return mmap_mem(file, vma); } - To unsubscribe from this list: send the line "unsubscribe git-commits-head" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html