Frame buffer / mmap() weirdness

[Gabriel Paubert]

	Hi, 

> > Don't know for mmap(), but it seems the only change to munmap() is
> > to clear the appropriate number of low-order bits in its first argument
> > ( addr & 0xfffff000 for 32-bit machines with 4k page size).
> 
> You are right. Since I guess the other mmap()s in the kernel are POSIX
> compliant, I feel silly now.

I probably have missed something but recent 2.3.xx kernels apparently
prohibit performing mmap at non page aligned offsets since
arch/${ARCH}/kernel/somefile.c constains sys_mmap which calls (rather
directly) mm/mmap.c{do_mmap} where

        if (off & ~PAGE_MASK)
                return -EINVAL;

so does Posix the offset value passed to mmap to be restricted  ? 

	Gabriel.


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