Query about Linux framebuffer implementation

[Russell King - ARM Linux]

On Tue, Mar 09, 2010 at 03:58:40PM +0800, 胡杨树 wrote:
> Hi, all
> 
> driver/video/fbmem.c implement framebuffer as a char device, in read/write API of this char device file operations, WHY does we need to: 
> 1st:kmalloc a space
> 2st:copy data between video memory buffer and kmalloced space above
> 3rd:copy kmalloced space data to/from user space buffer
> 
> why the hell we just copy data between video memory and user space buffer?

=> framebuffer mailing list (though that seems rather dead), maybe
lkml instead?