Hi
What do these lines do in fb_mmap() in file
drivers/video/fbmem.c
1) start = fix.smem_start;
len = PAGE_ALIGN((start &
~PAGE_MASK)+fix.smem_len);
if (off >= len) {
/* memory mapped io */
>>> if off >= len how do we suppose it is mem mapped
io
>>> here offset is; off = vma->vm_pgoff <<
PAGE_SHIFT;
2) start &= PAGE_MASK;
if ((vma->vm_end - vma->vm_start + off) > len)
return -EINVAL;
off += start;
>>> what is relation between offset and length, why
do we keep comparing them ???
wld appreciate if someone throws some light on this.
regards
Amit
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