Re: memory mapping of vmalloc

[Prakash Bhurke]

Hi  Hugh,

   rvmallaoc is working.
   Very Very Thanks.

Regards,
Prakash

--- Hugh Dickins <hugh@xxxxxxxxxxx> wrote:

> On Tue, 1 Mar 2005, Prakash Bhurke wrote:
> >   I am trying to map a vmalloc kernel buffer to
> user
> > space using remap_page_range(). In my module, this
> > function returns success if we call mmap() from
> user
> > space, but i can not access content of vmalloc
> buffer
> > from user space. Pointer returned by mmap()
> syscall
> > seems pointing to other memory page which contains
> > zeros. I am using linux 2.6.10 kernel on Pentium 4
> > system.
> 
> Look for "rvmalloc" in various drivers in the kernel
> source tree:
> you must SetPageReserved before remap_pfn_range (or
> remap_page_range)
> agrees to map the page, and ClearPageReserved before
> freeing after.
> 
> Hugh
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