Re: memory mapping of vmalloc

From: Prakash Bhurke (prakash_bhurke_at_yahoo.com)
Date: 03/02/05

  • Next message: Nikita Danilov: "Re: [2.6.11-rc5-mm1 patch] reiser4 Kconfig help cleanup" 
    Date:	Wed, 2 Mar 2005 06:28:36 -0800 (PST)
To: Hugh Dickins <hugh@veritas.com>

    Hi Hugh,

       rvmallaoc is working.
       Very Very Thanks.

    Regards,
    Prakash

    --- Hugh Dickins <hugh@veritas.com> 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
    > -
    > To unsubscribe from this list: send the line
    > "unsubscribe linux-kernel" in
    > the body of a message to majordomo@vger.kernel.org
    > More majordomo info at
    > http://vger.kernel.org/majordomo-info.html
    > Please read the FAQ at http://www.tux.org/lkml/
    >

            
                    
    __________________________________
    Celebrate Yahoo!'s 10th Birthday!
    Yahoo! Netrospective: 100 Moments of the Web
    http://birthday.yahoo.com/netrospective/
    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

  • Next message: Nikita Danilov: "Re: [2.6.11-rc5-mm1 patch] reiser4 Kconfig help cleanup"