> I am writing sendpage (this is called when sendfile system call is used) function for my protocol. User application calls with socket and filename, kernel maps file and pass struct page * to sendpage function.
>
> I use following expression to get virtual address and copy data
>
> virtual_address = phys_to_virt(page_to_pfn(page) << PAGE_SHIFT);
>
> This works fine on Pentium III machine with 515324 KB memory, but when I run same code on Xeon with 2074604 KB memory, I get
>
> Unable to handle kernel paging request at virtual address 3ab6c000
>
> Is this because this address (struct page *) is not mapped ? how do I check in my code whether it is mapped or not, since it is mapped on Pentium.
>
> Thanks for help.
Guys I need help.
On i386 machine, I get
* page 0xc1342180
* virtual da10c00
and on Xeon
* page 0xc1fc5ce0
* virtual 0x3a09d000
Is virtual address in case of Xeon not mapped ? do I need to map it ?
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